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<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Pocket Video Trimmer</title>
<style>
:root{
--bg:#0e1116; --panel:#161b22; --panel2:#1c232d; --line:#2a323d;
--txt:#e6edf3; --dim:#8b98a5; --accent:#4cc2ff; --accent2:#2a9fd6;
--ok:#3fb950; --warn:#d29922; --danger:#f85149;
--r:10px;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{
background:var(--bg); color:var(--txt);
font:14px/1.45 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
-webkit-font-smoothing:antialiased;
}
.wrap{max-width:1180px;margin:0 auto;padding:20px 20px 60px}
header{display:flex;align-items:center;gap:12px;margin-bottom:18px}
header h1{font-size:17px;margin:0;font-weight:600;letter-spacing:.2px}
header .sub{color:var(--dim);font-size:12.5px}
header .verwrap{display:flex;flex-direction:column;align-items:center;gap:3px;
text-decoration:none;cursor:pointer}
header .verwrap:hover .ver{border-color:var(--accent);color:var(--txt)}
header .verwrap:hover .by{opacity:1;text-decoration:underline}
header .ver{color:var(--dim);font-size:12px;font-variant-numeric:tabular-nums;
border:1px solid var(--line);border-radius:99px;padding:3px 10px;background:var(--panel)}
header .by{color:var(--dim);font-size:10px;letter-spacing:.3px;opacity:.8}
.spacer{flex:1}
button{
font:inherit;color:var(--txt);background:var(--panel2);border:1px solid var(--line);
padding:7px 13px;border-radius:8px;cursor:pointer;transition:.12s;
}
button:hover:not(:disabled){background:#242d39;border-color:#3a4553}
button:disabled{opacity:.4;cursor:not-allowed}
button.primary{background:var(--accent);border-color:var(--accent);color:#04121c;font-weight:600}
button.primary:hover:not(:disabled){background:#6bcfff}
button.ghost{background:transparent}
button.danger{color:#ffb4ae;border-color:#5a2b2b}
button.danger:hover:not(:disabled){background:#341c1c;border-color:#7a3a3a}
button.link{
background:none;border:0;padding:4px 0;margin:6px auto 0;display:block;
color:var(--dim);font-size:12px;text-decoration:underline;text-underline-offset:2px;
}
button.link:hover:not(:disabled){background:none;color:var(--accent)}
.icobtn{padding:7px 11px;font-variant-numeric:tabular-nums}
.small{padding:5px 10px;font-size:12.5px}
/* ---------- drop zone ---------- */
#drop{
border:2px dashed var(--line);border-radius:14px;padding:64px 24px;text-align:center;
background:var(--panel);cursor:pointer;transition:.15s;
}
#drop:hover,#drop.over{border-color:var(--accent);background:#12212b}
#drop h2{margin:0 0 6px;font-size:18px;font-weight:600}
#drop p{margin:0;color:var(--dim);font-size:13px}
#drop .big{font-size:38px;line-height:1;margin-bottom:14px;opacity:.65}
/* ---------- layout ---------- */
#app{display:none}
.grid{display:grid;grid-template-columns:1fr 316px;gap:18px;align-items:start}
@media(max-width:900px){.grid{grid-template-columns:1fr}}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:14px}
.card h3{margin:0 0 12px;font-size:12px;text-transform:uppercase;letter-spacing:.7px;color:var(--dim);font-weight:600}
.panelbox{background:#11161d;border:1px solid var(--line);border-radius:10px;
padding:10px 12px 4px;margin-bottom:14px}
h3.collap{display:flex;align-items:center;justify-content:space-between;cursor:pointer;user-select:none;
margin:-10px -12px 10px;padding:9px 12px;border-radius:9px 9px 0 0;background:#171d26;
border-bottom:1px solid var(--line);color:var(--txt)}
h3.collap:hover{background:#1c232d}
h3.collap.shut{margin-bottom:-4px;border-bottom:none;border-radius:9px}
h3.collap .chev{font-size:11px;color:var(--accent);transition:transform .15s;transform:rotate(0deg)}
h3.collap.shut .chev{transform:rotate(-90deg)}
.stage{background:#000;border-radius:var(--r);overflow:hidden;display:flex;align-items:center;justify-content:center;position:relative;border:1px solid var(--line)}
.stage video,.stage canvas{max-width:100%;max-height:56vh;display:block}
#exportCanvas{display:none}
.badge{position:absolute;top:10px;left:10px;z-index:3;background:rgba(0,0,0,.66);backdrop-filter:blur(4px);
padding:4px 9px;border-radius:6px;font-size:11.5px;color:#cfe;letter-spacing:.3px}
/* ---------- crop overlay ---------- */
#cropLayer{position:absolute;display:none;touch-action:none;z-index:2}
#cropBox{position:absolute;box-shadow:0 0 0 9999px rgba(4,7,11,.62);
border:1px solid rgba(255,255,255,.92);cursor:move;box-sizing:border-box}
#cropBox::after{content:"";position:absolute;inset:0;pointer-events:none;
background:
linear-gradient(to right,transparent calc(33.33% - 0.5px),rgba(255,255,255,.3) calc(33.33% - 0.5px),rgba(255,255,255,.3) calc(33.33% + 0.5px),transparent calc(33.33% + 0.5px),transparent calc(66.66% - 0.5px),rgba(255,255,255,.3) calc(66.66% - 0.5px),rgba(255,255,255,.3) calc(66.66% + 0.5px),transparent calc(66.66% + 0.5px)),
linear-gradient(to bottom,transparent calc(33.33% - 0.5px),rgba(255,255,255,.3) calc(33.33% - 0.5px),rgba(255,255,255,.3) calc(33.33% + 0.5px),transparent calc(33.33% + 0.5px),transparent calc(66.66% - 0.5px),rgba(255,255,255,.3) calc(66.66% - 0.5px),rgba(255,255,255,.3) calc(66.66% + 0.5px),transparent calc(66.66% + 0.5px));}
.ch{position:absolute;width:16px;height:16px;background:#fff;border:1px solid rgba(0,0,0,.65);border-radius:3px;z-index:2}
.ch:hover{background:var(--accent)}
.ch[data-h=nw]{left:-8px;top:-8px;cursor:nwse-resize}
.ch[data-h=ne]{right:-8px;top:-8px;cursor:nesw-resize}
.ch[data-h=sw]{left:-8px;bottom:-8px;cursor:nesw-resize}
.ch[data-h=se]{right:-8px;bottom:-8px;cursor:nwse-resize}
.ch[data-h=n]{left:calc(50% - 8px);top:-8px;cursor:ns-resize}
.ch[data-h=s]{left:calc(50% - 8px);bottom:-8px;cursor:ns-resize}
.ch[data-h=w]{left:-8px;top:calc(50% - 8px);cursor:ew-resize}
.ch[data-h=e]{right:-8px;top:calc(50% - 8px);cursor:ew-resize}
.cropdims{position:absolute;left:50%;transform:translateX(-50%);bottom:5px;
background:rgba(0,0,0,.75);color:#dff;padding:2px 8px;border-radius:5px;
font-size:11px;font-variant-numeric:tabular-nums;white-space:nowrap;pointer-events:none}
#cropBtn.on{background:var(--accent);border-color:var(--accent);color:#04121c;font-weight:600}
#cropBtn.on .kbd{background:rgba(0,0,0,.15);border-color:rgba(0,0,0,.25);color:#04121c}
.arlab{color:var(--dim);font-size:11px;text-transform:uppercase;letter-spacing:.6px;margin:2px 0 5px}
.arRow{margin-bottom:8px}
.arcustom{display:flex;align-items:center;gap:6px;margin-bottom:4px}
.arcustom input{width:100%;min-width:0;text-align:center}
.arcustom span{color:var(--dim)}
.arcustom.on input{border-color:var(--accent)}
/* ---------- transport ---------- */
.transport{display:flex;align-items:center;gap:8px;margin-top:12px;flex-wrap:wrap}
.tc{font-variant-numeric:tabular-nums;font-size:13px;color:var(--dim)}
.tc b{color:var(--txt);font-weight:600}
/* ---------- timeline ---------- */
.tl-wrap{margin-top:14px;user-select:none}
.tl{position:relative;height:70px;background:var(--panel2);border:1px solid var(--line);border-radius:8px;overflow:hidden;touch-action:none;cursor:pointer}
#strip{position:absolute;inset:0;display:flex;opacity:.9}
#strip canvas{height:100%;flex:1 1 0;min-width:0;display:block}
.mask{position:absolute;top:0;bottom:0;background:rgba(6,9,13,.72);pointer-events:none}
.sel{position:absolute;top:0;bottom:0;border-left:2px solid var(--accent);border-right:2px solid var(--accent);
box-shadow:inset 0 0 0 1px rgba(76,194,255,.25);pointer-events:none}
.handle{position:absolute;top:0;bottom:0;width:16px;margin-left:-8px;cursor:ew-resize;touch-action:none;z-index:5}
.handle::after{content:"";position:absolute;left:5px;top:50%;transform:translateY(-50%);
width:6px;height:26px;border-radius:3px;background:var(--accent);box-shadow:0 0 0 1px rgba(0,0,0,.4)}
.handle:hover::after{background:#8bd8ff}
.playhead{position:absolute;top:0;bottom:0;width:2px;margin-left:-1px;background:#fff;pointer-events:none;z-index:6;box-shadow:0 0 6px rgba(255,255,255,.7)}
.ruler{display:flex;justify-content:space-between;margin-top:4px;color:var(--dim);font-size:11px;font-variant-numeric:tabular-nums}
/* saved clips drawn along the bottom of the timeline */
#segBand{position:absolute;left:0;right:0;bottom:0;height:16px;pointer-events:none;z-index:4}
.segbar{position:absolute;bottom:0;height:16px;min-width:3px;background:rgba(63,185,80,.42);
border:1px solid rgba(63,185,80,.95);border-radius:3px;overflow:hidden;
font-size:9.5px;line-height:14px;text-align:center;color:#dfffe6;font-weight:600}
.segbar.on{background:rgba(76,194,255,.5);border-color:#8bd8ff;color:#eaf7ff}
/* ---------- shift bar ---------- */
.shiftrow{display:flex;align-items:center;gap:8px;margin-top:7px}
.shift-lbl{color:var(--dim);font-size:11px;font-variant-numeric:tabular-nums;letter-spacing:.2px}
.shift-lbl b{color:var(--accent);font-weight:600}
.shiftbtns{display:flex;gap:2px}
.shiftbtns button{min-width:26px;padding:0 6px;font-size:14px;line-height:20px;border-radius:5px;
background:transparent;border-color:transparent;color:var(--dim);text-align:center}
.shiftbtns button:hover:not(:disabled){background:var(--panel2);border-color:var(--line);color:var(--txt)}
/* 4px of visible track sitting 2px under the timeline; the grab area extends
below it so a thin line is still easy to catch */
.shiftbar{position:relative;height:12px;margin-top:2px;touch-action:none;cursor:pointer}
.shiftbar::before{content:"";position:absolute;left:0;right:0;top:0;height:4px;
background:#252d38;border-radius:99px}
.shiftbar:hover .shiftblk{background:#6bcfff}
.shiftblk{position:absolute;top:0;height:4px;min-width:12px;
background:var(--accent);border-radius:99px;cursor:grab;transition:background .12s}
.shiftblk:active{cursor:grabbing}
.marks{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap;align-items:center}
.pill{background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:6px 10px;font-size:12.5px;font-variant-numeric:tabular-nums}
.pill span{color:var(--dim)}
.pill b{font-weight:600}
.pill.dur b{color:var(--accent)}
.edit{cursor:text;border-bottom:1px dotted #4a5663;padding-bottom:1px}
.edit:hover{border-bottom-color:var(--accent);color:var(--accent)}
.edit input{width:88px;padding:0 3px;border:1px solid var(--accent);border-radius:4px;
background:#0b0f14;color:var(--txt);font:inherit;font-weight:600;text-align:center}
/* ---------- clip list ---------- */
#clipsWrap{display:none;margin-top:18px}
.clips-head{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.clips-head h3{margin:0;font-size:12px;text-transform:uppercase;letter-spacing:.7px;color:var(--dim);font-weight:600}
#clipList{border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--panel)}
.crow{display:flex;align-items:center;gap:10px;padding:7px 10px;border-top:1px solid var(--line);font-size:12.5px}
.crow:first-child{border-top:none}
.crow:hover{background:var(--panel2)}
.crow.on{background:#12212b;box-shadow:inset 2px 0 0 var(--accent)}
.cthumb{border-radius:3px;border:1px solid var(--line);display:block;flex:none}
.crow.over{opacity:.45}
.crow.over .cthumb{filter:grayscale(1)}
.crow.over .cdur{color:var(--warn)}
.cnum{width:20px;color:var(--dim);font-variant-numeric:tabular-nums;flex:none}
.cname{flex:1 1 90px;min-width:60px;max-width:230px;display:flex;align-items:center}
.cname input{width:100%;background:transparent;border:1px solid transparent;border-radius:6px;
padding:2px 6px;color:var(--txt);font:inherit}
.cname input:hover{border-color:var(--line)}
.cname input:focus{outline:none;border-color:var(--accent);background:#0b0f14}
.cname input::placeholder{color:#5a6572}
.ctimes{font-variant-numeric:tabular-nums;color:var(--dim);flex:none}
.ctimes b{color:var(--txt);font-weight:600}
.cdur{font-variant-numeric:tabular-nums;color:var(--accent);font-weight:600;width:64px;text-align:right;flex:none}
.cbtns{display:flex;gap:4px;flex:none}
.cbtns button{padding:3px 8px;font-size:11.5px;border-radius:6px}
@media(max-width:760px){ .ctimes{display:none} }
/* ---------- settings ---------- */
.row{display:flex;align-items:center;gap:8px;margin-bottom:10px}
.row label{flex:0 0 78px;color:var(--dim);font-size:12.5px}
input[type=text],input[type=number],select{
font:inherit;background:var(--panel2);color:var(--txt);border:1px solid var(--line);
border-radius:7px;padding:6px 8px;width:100%;min-width:0;
}
input:focus,select:focus{outline:none;border-color:var(--accent)}
input[type=range]{width:100%;accent-color:var(--accent)}
.seg{display:flex;gap:5px;flex-wrap:wrap;margin-bottom:10px}
.seg button{padding:5px 9px;font-size:12.5px;border-radius:7px}
.seg button.on{background:var(--accent);border-color:var(--accent);color:#04121c;font-weight:600}
.hint{color:var(--dim);font-size:11.5px;margin:-4px 0 12px}
.chk{display:flex;align-items:center;gap:7px;color:var(--dim);font-size:12.5px;margin-bottom:10px;cursor:pointer}
hr{border:none;border-top:1px solid var(--line);margin:14px 0}
.est{background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:9px 11px;font-size:12.5px;margin-bottom:12px}
.est div{display:flex;justify-content:space-between;margin:2px 0}
.est span{color:var(--dim)}
.est b{font-variant-numeric:tabular-nums;font-weight:600}
#exportBtn{width:100%;padding:11px}
#snapBtn,#sbBtn,#gifBtn,#msBtn{width:100%;padding:9px;margin-top:2px}
/* ---------- tabs ---------- */
/* browser-style tabs: the active one joins onto the panel below it */
/* no left padding, and the strip's underline matches the panel border, so the
active tab's edges line up exactly with the box beneath it */
.tabs{display:flex;gap:3px;margin:0;padding:0;border-bottom:1px solid #2f5f79;position:relative;z-index:1}
.tabs button{flex:1;padding:8px 10px;font-size:12.5px;color:var(--dim);
background:transparent;border:1px solid transparent;border-bottom:none;
border-radius:9px 9px 0 0;margin-bottom:-1px;position:relative}
.tabs button:hover:not(.on){color:var(--txt);background:rgba(255,255,255,.03);border-color:transparent}
.tabs button.on{background:#16303f;border-color:#2f5f79;border-top:2px solid var(--accent);
color:#bfe9ff;font-weight:600;padding-top:7px}
.tabs button.on::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:#16303f}
.tabpanel{background:#16303f;border:1px solid #2f5f79;border-top:none;
border-radius:0 0 10px 10px;padding:13px 12px 12px;margin-bottom:12px}
.tabpanel hr{border-top-color:#2f5f79}
.tabpanel h3{color:#8fc9e6}
.ends{display:flex;justify-content:space-between;color:var(--dim);font-size:11px;margin:3px 0 8px}
.grid2{display:flex;align-items:center;gap:6px;margin-bottom:8px}
.grid2 input{width:100%;min-width:0;text-align:center}
.grid2 span{color:var(--dim);font-size:12.5px}
.grid2 label{flex:0 0 44px;color:var(--dim);font-size:12.5px}
#stopBtn{width:100%;padding:9px;margin-top:8px;display:none}
.bar{height:6px;background:var(--panel2);border-radius:99px;overflow:hidden;margin-top:10px;display:none}
.bar i{display:block;height:100%;width:0;background:var(--accent);transition:width .2s}
#status{font-size:12px;color:var(--dim);margin-top:8px;text-align:center;min-height:16px}
#result{display:none;margin-top:14px}
#result video{width:100%;border-radius:8px;background:#000;border:1px solid var(--line)}
#saved{display:none;margin-top:14px;border:1px solid var(--line);border-radius:8px;background:var(--panel2);padding:10px 12px}
#saved h4{margin:0 0 6px;font-size:12px;text-transform:uppercase;letter-spacing:.7px;color:var(--dim)}
#savedList{margin:0;padding-left:16px;font-size:12px;color:var(--txt);line-height:1.7;max-height:190px;overflow:auto}
.note{font-size:11.5px;color:var(--warn);margin-top:8px;line-height:1.4}
.kbd{display:inline-block;background:var(--panel2);border:1px solid var(--line);border-bottom-width:2px;
border-radius:5px;padding:0 5px;font-size:11px;font-family:ui-monospace,Menlo,Consolas,monospace}
.keys{color:var(--dim);font-size:11.5px;margin-top:12px;line-height:1.9}
</style>
</head>
<body>
<div class="wrap">
<header>
<h1>Pocket Video Trimmer</h1>
<span class="sub">trim · resize · fps · storyboard</span>
<span class="spacer"></span>
<button id="newBtn" class="ghost" style="display:none">Load another video</button>
<a class="verwrap" href="https://huggingface.co/PoopMan333" target="_blank" rel="noopener noreferrer"
title="C_Nugget on Hugging Face"><span class="ver">v3.6</span><span class="by">by C_Nugget</span></a>
</header>
<div id="drop">
<div class="big">▢</div>
<h2>Drop a video here</h2>
<p>or click to choose a file · MP4, MOV, WebM, MKV · nothing is uploaded, it all stays on this computer</p>
<input type="file" id="file" accept="video/*" hidden>
</div>
<div id="app">
<div class="grid">
<!-- LEFT -->
<div>
<div class="stage" id="stage">
<video id="video" playsinline></video>
<canvas id="exportCanvas"></canvas>
<div id="cropLayer">
<div id="cropBox" data-h="move">
<span class="ch" data-h="nw"></span><span class="ch" data-h="n"></span><span class="ch" data-h="ne"></span>
<span class="ch" data-h="w"></span><span class="ch" data-h="e"></span>
<span class="ch" data-h="sw"></span><span class="ch" data-h="s"></span><span class="ch" data-h="se"></span>
<span class="cropdims" id="cropDims"></span>
</div>
</div>
<div class="badge" id="srcBadge"></div>
</div>
<div class="transport">
<button id="playBtn" class="icobtn" title="Play / pause (Space)">▶</button>
<button id="prevF" class="icobtn" title="Previous frame (←)">⇤</button>
<button id="nextF" class="icobtn" title="Next frame (→)">⇥</button>
<span class="tc"><b id="curTime">0:00.00</b> / <span id="totTime">0:00.00</span></span>
<span class="spacer"></span>
<button id="cropBtn" title="Show or hide the crop box (C)">Crop <span class="kbd">C</span></button>
<button id="setIn">Set start <span class="kbd">I</span></button>
<button id="setOut">Set end <span class="kbd">O</span></button>
<button id="loopBtn" class="ghost" title="Loop the selection">Loop: off</button>
</div>
<div class="tl-wrap">
<div class="tl" id="tl">
<div id="strip"></div>
<div class="mask" id="maskL"></div>
<div class="mask" id="maskR"></div>
<div class="sel" id="sel"></div>
<div id="segBand"></div>
<div class="playhead" id="ph"></div>
<div class="handle" id="hIn"></div>
<div class="handle" id="hOut"></div>
</div>
<div class="shiftbar" id="shiftBar" title="Drag to move the selection without changing its length">
<div class="shiftblk" id="shiftBlk"></div>
</div>
<div class="ruler"><span>0:00</span><span id="rulMid"></span><span id="rulEnd"></span></div>
<div class="shiftrow">
<span class="shift-lbl" id="shiftLbl"></span>
<span class="spacer"></span>
<span class="shiftbtns" id="shiftBtns">
<button data-d="-1" title="Back one second (Shift + [)">«</button>
<button data-d="-f" title="Back one frame ([)">‹</button>
<button data-d="f" title="Forward one frame (])">›</button>
<button data-d="1" title="Forward one second (Shift + ])">»</button>
</span>
</div>
<div class="marks">
<span class="pill"><span>Start</span> <b id="pIn" class="edit" title="Click to type an exact time">0:00.00</b></span>
<span class="pill"><span>End</span> <b id="pOut" class="edit" title="Click to type an exact time">0:00.00</b></span>
<span class="pill dur"><span>Duration</span> <b id="pDur" class="edit" title="Click to type an exact length, e.g. 30 or 1:30">0:00.00</b></span>
<button id="addClip" class="primary small" title="Save this selection to the clip list (A)">+ Add clip <span class="kbd" style="background:rgba(0,0,0,.15);border-color:rgba(0,0,0,.25)">A</span></button>
<button id="resetSel" class="ghost small">Reset to full clip</button>
</div>
<div class="keys">
<span class="kbd">Space</span> play/pause <span class="kbd">←</span><span class="kbd">→</span> step 1 frame
<span class="kbd">Shift</span>+<span class="kbd">←</span><span class="kbd">→</span> step 1 sec
<span class="kbd">I</span> set start <span class="kbd">O</span> set end <span class="kbd">A</span> <span id="keyA">add clip</span> <span class="kbd">C</span> crop <span class="kbd">S</span> snapshot <span class="kbd">Home</span>/<span class="kbd">End</span> jump
<br>Click <b style="color:var(--txt)">Start</b>, <b style="color:var(--txt)">End</b> or <b style="color:var(--txt)">Duration</b> above to type an exact value — seconds (<code>90</code>) or minutes:seconds (<code>1:30</code>).
</div>
<!-- manual storyboard frames: only in picture mode -->
<div id="snapsWrap" style="display:none">
<div class="clips-head">
<h3 id="snapsTitle">Snapshots</h3>
<span class="spacer"></span>
<button id="clearSnaps" class="ghost small">Clear all</button>
</div>
<div id="snapList"></div>
<div class="hint" style="margin-top:8px">
The exact frames your manual storyboard will use, in this order. Park the playhead and press
<b style="color:var(--txt)">+ Add snapshot</b> (or <span class="kbd">A</span>). Set the grid over in
<b style="color:var(--txt)">Manual Storyboard</b>, then export.
</div>
</div>
<!-- clip list: only appears once you add something -->
<div id="clipsWrap">
<div class="clips-head">
<h3 id="clipsTitle">Clip list</h3>
<span class="spacer"></span>
<button id="clearClips" class="ghost small">Clear all</button>
</div>
<div id="clipList"></div>
<div class="hint" style="margin-top:8px">
Export uses this list — the timeline selection is only used for adding new clips.
Use ▶ to preview a clip, Set to overwrite it with the current timeline selection, ✕ to remove it. Click its times to type exact values.
Names are optional and become the file name.
</div>
</div>
</div>
</div>
<!-- RIGHT -->
<div>
<div class="card">
<div class="panelbox">
<h3 class="collap open" id="sizeHead">Size & crop<span class="chev">▾</span></h3>
<div id="sizeBody">
<div id="cropSection" style="display:none">
<h3>Crop & aspect ratio</h3>
<div class="seg arRow">
<button data-ar="0" data-lbl="free">Free</button>
<button data-ar="src" data-lbl="original">Original</button>
<button data-ar="1" data-lbl="1:1">1:1 square</button>
</div>
<div class="arlab">Landscape</div>
<div class="seg arRow">
<button data-ar="2.33333" data-lbl="21:9">21:9</button>
<button data-ar="1.77778" data-lbl="16:9">16:9</button>
<button data-ar="1.5" data-lbl="3:2">3:2</button>
<button data-ar="1.33333" data-lbl="4:3">4:3</button>
</div>
<div class="arlab">Portrait</div>
<div class="seg arRow">
<button data-ar="0.5625" data-lbl="9:16">9:16</button>
<button data-ar="0.5" data-lbl="1:2">1:2</button>
<button data-ar="0.66667" data-lbl="2:3">2:3</button>
<button data-ar="0.75" data-lbl="3:4">3:4</button>
<button data-ar="0.8" data-lbl="4:5">4:5</button>
</div>
<div class="arlab">Custom</div>
<div class="arcustom" id="arCustom">
<input type="number" id="arW" min="1" max="9999" step="1" placeholder="9">
<span>:</span>
<input type="number" id="arH" min="1" max="9999" step="1" placeholder="16">
<button id="arApply" class="small">Use</button>
</div>
<div class="hint" id="cropInfo" style="margin:8px 0"></div>
<button id="cropMax" class="small" style="width:100%">Biggest box that fits</button>
<hr>
</div>
<div class="seg" id="scaleSeg">
<button data-s="1">100%</button>
<button data-s="0.75">75%</button>
<button data-s="0.5">50%</button>
<button data-s="0.25">25%</button>
</div>
<div class="row">
<label>Width</label><input type="number" id="w" min="16" step="2">
</div>
<div class="row">
<label>Height</label><input type="number" id="h" min="16" step="2">
</div>
<label class="chk"><input type="checkbox" id="lockAr" checked> Lock aspect ratio</label>
<div class="hint" id="sizeHint"></div>
</div>
</div>
<div class="tabs" id="tabs">
<button data-tab="video" class="on">Export video</button>
<button data-tab="pic">Export picture</button>
</div>
<div id="tabVideo" class="tabpanel">
<h3>Frame rate</h3>
<div class="seg" id="fpsSeg"></div>
<div class="row">
<label>Custom</label><input type="number" id="fps" min="1" max="120" step="1">
</div>
<div class="hint">Higher than the source frame rate won't add detail.</div>
<label class="chk" style="margin-top:10px"><input type="checkbox" id="cfr"> Fixed frame rate</label>
<label class="chk"><input type="checkbox" id="h3"> H3-compliant frame count (17n+5)</label>
<div class="hint" id="cfrHint"></div>
<hr>
<h3>Compression</h3>
<input type="range" id="q" min="0" max="100" value="78">
<div class="ends"><span>Smaller file</span><span>Bigger file</span></div>
<div class="hint" id="qHint"></div>
<label class="chk"><input type="checkbox" id="keepAudio" checked> Include audio</label>
<div class="est">
<div><span>Output</span><b id="eSize">—</b></div>
<div><span>Bitrate</span><b id="eRate">—</b></div>
<div><span>Encoder</span><b id="eCodec">—</b></div>
<div><span id="eBytesLbl">Est. file size</span><b id="eBytes">—</b></div>
<div><span>Export takes about</span><b id="eTime">—</b></div>
</div>
<button id="exportBtn" class="primary">Export clip</button>
<button id="audioBtn" class="link" title="Save the selection's audio on its own, as a WAV">Extract audio only</button>
</div>
<div id="tabPic" class="tabpanel" style="display:none">
<h3>Largest side</h3>
<div class="row">
<label>Max px</label><input type="number" id="imgMax" min="64" max="8000" step="10" value="1920">
</div>
<div class="hint" id="imgMaxHint">Pictures are scaled down to fit inside this. Applies to snapshots, storyboards and GIFs.</div>
<label class="chk" style="margin-top:10px"><input type="checkbox" id="bgWork" checked> Keep working in the background</label>
<div class="hint">Storyboards and GIFs carry on while you're in another tab. Video exports still have to pause — browsers stop decoding video for a hidden tab.</div>
<hr>
<h3>Single frame</h3>
<div class="hint">Saves the frame you are parked on right now, as a PNG.</div>
<button id="snapBtn" class="primary" title="Save the current frame as an image (S)">Take snapshot</button>
<div id="autoSbSec">
<hr>
<h3>Auto Storyboard <span style="color:var(--warn);font-size:10px">BETA</span></h3>
<div class="grid2">
<label>Grid</label>
<input type="number" id="sbCols" min="1" max="10" step="1" value="3">
<span>×</span>
<input type="number" id="sbRows" min="1" max="10" step="1" value="3">
</div>
<div class="hint" id="sbHint"></div>
<label class="chk"><input type="checkbox" id="sbNum"> Number the frames (1, 2, 3…)</label>
<button id="sbBtn" class="primary" title="A sheet of frames spread evenly across the selection">Export storyboard</button>
</div>
<div id="manSbSec" style="display:none">
<hr>
<h3>Manual Storyboard <span style="color:var(--warn);font-size:10px">BETA</span></h3>
<div class="grid2">
<label>Grid</label>
<input type="number" id="msCols" min="1" max="10" step="1" value="3">
<span>×</span>
<input type="number" id="msRows" min="1" max="10" step="1" value="3">
</div>
<div class="hint" id="msHint"></div>
<label class="chk"><input type="checkbox" id="msNum"> Number the frames (1, 2, 3…)</label>
<button id="msBtn" class="primary">Export manual storyboard</button>
</div>
<hr>
<h3>Animated GIF</h3>
<div class="row">
<label>Frames/s</label><input type="number" id="gfps" min="1" max="20" step="1" value="10">
</div>
<div class="hint" id="gifHint">256 colours and no sound, and files grow fast. A smaller width helps.</div>
<button id="gifBtn" class="primary">Export as GIF</button>
</div>
<button id="stopBtn" class="danger">Stop</button>
<div class="bar" id="bar"><i id="barI"></i></div>
<div id="status"></div>
<div class="hint" id="expNote" style="display:none;margin:8px 0 0;text-align:center">
Leave this tab on screen — if you switch away, the export pauses and picks up when you come back.
</div>
<div id="failBox" style="display:none;margin:10px 0 0;padding:11px 12px;border:1px solid #5a2b2b;
border-radius:9px;background:#241a1a">
<div class="note" id="failNote" style="margin:0"></div>
<button id="logBtn" class="small" style="margin-top:9px"
title="Copy a technical log of the last export">Copy export log</button>
</div>
<div id="result">
<video id="outVid" controls></video>
<img id="outImg" alt="" style="display:none;width:100%;border-radius:8px;background:#000;border:1px solid var(--line)">
<div style="display:flex;gap:8px;margin-top:10px">
<button id="dlBtn" class="primary" style="flex:1">Download again</button>
<button id="clearRes" class="ghost">Clear</button>
</div>
<div class="note" id="outNote"></div>
</div>
<div id="saved">
<h4 id="savedWhere">Saved</h4>
<ol id="savedList"></ol>
<div class="note" id="savedNote"></div>
</div>
</div>
</div>
</div>
</div>
</div>
<script>
"use strict";
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const $ = id => document.getElementById(id);
const clamp = (v,a,b) => Math.min(b, Math.max(a, v));
function tc(t, frac){ // 1:23.45 / 1:05:03.20
if(!isFinite(t)||t<0) t=0;
const h = Math.floor(t/3600);
const m = Math.floor((t-h*3600)/60), s = t - h*3600 - m*60;
const mm = h ? String(m).padStart(2,"0") : String(m);
const hh = h ? h+":" : "";
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: hh+mm+":"+(s<10?"0":"")+s.toFixed(2);
}
function stamp(t){ t=Math.max(0,t||0); return Math.floor(t/60)+"m"+String(Math.floor(t%60)).padStart(2,"0")+"s"; }
/* Decimal, not binary. Bit rates are decimal (1 Mbps = 1,000,000 bits) so a
1024-based readout made every estimate read about 5% low against the number
it was calculated from, and 7% low once it reached GB. macOS and most Linux
file managers count the same way; Windows Explorer is the odd one out and
will show these files as slightly smaller. */
function bytes(n){
if(!isFinite(n)) return "—";
if(n < 1e6) return (n/1e3).toFixed(0)+" KB";
if(n < 1e9) return (n/1e6).toFixed(1)+" MB";
return (n/1e9).toFixed(2)+" GB";
}
function even(n){ n = Math.round(n); return n%2 ? n+1 : n; }
function safeName(s, n){ return String(s||"").replace(/[\\/:*?"<>|\x00-\x1f]+/g,"-").replace(/^\.+/,"").trim().slice(0,n||60); }
function once(el,ev){ return new Promise(r=>el.addEventListener(ev,r,{once:true})); }
/* ---------------- state ---------------- */
const V = $("video");
let srcUrl=null, srcName="clip", srcFile=null, dur=0, natW=0, natH=0, srcFps=30;
let inT=0, outT=0, looping=false, dragging=null, exporting=false, cancelExport=false;
let audioCtx=null, mediaSrc=null, monitorGain=null, streamDest=null;
let lastBlob=null, lastExt="webm", lastMeta=null, sheetKind="auto";
let segments=[], activeSeg=-1, segId=0;
/* ---------------- file loading ---------------- */
const drop=$("drop"), fileInput=$("file");
fileInput.addEventListener("click", e=>e.stopPropagation());
drop.addEventListener("click", ()=>fileInput.click());
fileInput.addEventListener("change", e=>{ if(e.target.files[0]) load(e.target.files[0]); e.target.value=""; });
["dragenter","dragover"].forEach(ev=>drop.addEventListener(ev,e=>{e.preventDefault();drop.classList.add("over")}));
["dragleave","drop"].forEach(ev=>drop.addEventListener(ev,e=>{e.preventDefault();drop.classList.remove("over")}));
// ONE drop handler only, on the window — two handlers meant a drop started the load twice
window.addEventListener("dragover", e=>e.preventDefault());
window.addEventListener("drop", e=>{
e.preventDefault(); drop.classList.remove("over");
const f = e.dataTransfer && e.dataTransfer.files[0];
if(f) load(f);
});
$("newBtn").addEventListener("click", ()=>fileInput.click());
const DROP_HTML = drop.innerHTML;
let loadSeq = 0; // only the newest load() is allowed to touch the UI
let loadedOnce = false;
async function load(file){
if(exporting){ alert("Hang on until the export finishes, then load the next video."); return; }
if(segments.length && loadedOnce &&
!confirm("Loading a new video clears the clip list ("+segments.length+" clips). Continue?")) return;
const myId = ++loadSeq;
const newUrl = URL.createObjectURL(file);
const prevUrl = srcUrl;
const bail = (msg)=>{
URL.revokeObjectURL(newUrl);
if(myId !== loadSeq) return; // a newer load took over — stay quiet
srcUrl = prevUrl;
if(loadedOnce){ // don't destroy a session that's already open
if(V.src !== prevUrl && prevUrl){ V.src = prevUrl; }
alert(msg+"\n\nYour current video is still open.");
}else{
drop.innerHTML = DROP_HTML; drop.style.display="block"; $("app").style.display="none";
alert(msg);
}
};
srcName = (file.name||"clip").replace(/\.[^.]+$/,"") || "clip";
srcFile = file; // kept so the audio can be pulled out later
srcUrl = newUrl;
clearResult(); clearSaved();
V.src = newUrl;
V.muted = false;
const how = await new Promise(res=>{
let settled=false, timer=0;
const done = v => { if(settled) return; settled=true; clearTimeout(timer);
V.onloadedmetadata=null; V.onerror=null; res(v); };
V.onloadedmetadata = ()=>done("ok");
V.onerror = ()=>done("err");
timer = setTimeout(()=>done("slow"), 120000);
});
if(myId !== loadSeq){ URL.revokeObjectURL(newUrl); return; }
if(how==="err") return bail("This browser can't open “"+file.name+"”.\n\nTry an MP4, MOV or WebM file — Chrome can't read every format (AVI and some MKVs won't work).");
if(how==="slow") return bail("“"+file.name+"” is taking too long to open. If it's on a network or cloud drive, copy it to this computer first.");
dur = V.duration;
if(!isFinite(dur) || dur<=0){ // some WebM/MKV files report no duration until you seek past the end
try{
V.currentTime = 1e7;
await Promise.race([once(V,"seeked"), new Promise(r=>setTimeout(r,2500))]);
dur = isFinite(V.duration) ? V.duration : V.currentTime;
V.currentTime = 0;
await Promise.race([once(V,"seeked"), new Promise(r=>setTimeout(r,1500))]);
}catch(e){}
}
if(myId !== loadSeq){ URL.revokeObjectURL(newUrl); return; }
if(!isFinite(dur) || dur<=0) return bail("Couldn't work out how long that video is, so it can't be trimmed. Try converting it to MP4 first.");
if(prevUrl) URL.revokeObjectURL(prevUrl); // safe now: the new file is definitely in
natW = V.videoWidth || 640; natH = V.videoHeight || 360;
inT = 0; outT = dur;
segments = []; activeSeg = -1;
removeCrop();
if(!loadedOnce) drop.innerHTML = '<div class="big">▢</div><h2>Reading video…</h2><p>one moment</p>';
srcFps = 30;
await detectFps();
if(myId !== loadSeq) return;
loadedOnce = true;
drop.style.display="none"; $("app").style.display="block"; $("newBtn").style.display="inline-block";
$("w").value = natW; $("h").value = natH;
$("totTime").textContent = tc(dur);
$("rulEnd").textContent = tc(dur,false);
$("rulMid").textContent = tc(dur/2,false);
buildFpsSeg();
$("fps").value = Math.round(srcFps);
$("srcBadge").textContent = natW+"×"+natH+" · "+Math.round(srcFps)+" fps · "+tc(dur,false);
document.title = srcName+" — Pocket Video Trimmer";
markScale(1);
refresh(); update();
buildStrip(newUrl, myId);
}
/* estimate source fps by counting presented frames over a short muted sample */
async function detectFps(){
if(!("requestVideoFrameCallback" in HTMLVideoElement.prototype)) return;
const prevMuted = V.muted;
V.muted = true;
let stop = false;
try{
V.currentTime = Math.min(0.2, dur/4);
await Promise.race([once(V,"seeked"), new Promise(r=>setTimeout(r,1500))]);
let first=null, last=null, n=0;
const done = new Promise(res=>{
const finish = ()=>{ stop=true; res(); };
const cb=(now,md)=>{
if(stop) return;
if(first===null) first=md.mediaTime; else { last=md.mediaTime; n++; }
if(n>=12 || (last!==null && last-first>0.5)) return finish();
V.requestVideoFrameCallback(cb);
};
V.requestVideoFrameCallback(cb);
setTimeout(finish, 1400); // rVFC never fired (or is throttled) — give up
});
await V.play().catch(()=>{});
await done;
if(n>2 && last>first){
const f = n/(last-first);
if(f>4 && f<125) srcFps = Math.round(f*100)/100;
}
}catch(e){}
stop = true;
try{ V.pause(); }catch(e){}
V.muted = prevMuted;
V.currentTime = 0;
await Promise.race([once(V,"seeked"), new Promise(r=>setTimeout(r,800))]);
}
/* ---------------- filmstrip ---------------- */
async function buildStrip(url, id){
const strip=$("strip"); strip.innerHTML="";
const total=dur;
const v=document.createElement("video");
v.src=url; v.muted=true; v.playsInline=true;
try{
await Promise.race([once(v,"loadeddata"), once(v,"error"), new Promise(r=>setTimeout(r,15000))]);
}catch(e){ return; }
const vw=v.videoWidth||16, vh=v.videoHeight||9;
const stripW=Math.max(240, strip.clientWidth || $("tl").clientWidth || 900);
const stripH=Math.max(28, strip.clientHeight || $("tl").clientHeight || 64);
// Pick the number of frames from the video's own shape rather than a fixed 12.
// A portrait clip gets lots of narrow thumbnails instead of squashed wide ones.
// Keep the count modest: every thumbnail is a full decode+seek of the source,
// and on tall phone footage that used to mean 30-40 of them. 1x pixels is
// plenty at this size.
const ideal = Math.max(16, Math.round(stripH*vw/vh));
const N = clamp(Math.round(stripW/ideal), 6, 16);
const cw = Math.max(8, Math.round(stripW/N)), ch = Math.max(8, Math.round(stripH));
const sc = Math.max(cw/vw, ch/vh); // fill the cell without stretching
const dw = vw*sc, dh = vh*sc, ox=(cw-dw)/2, oy=(ch-dh)/2;
for(let i=0;i<N;i++){
if(id !== loadSeq){ v.removeAttribute("src"); return; }
// Stand aside while an export is running. Decoding thumbnails from a second
// copy of the video used to fight the export for the same decoder, which
// dropped frames and made the output stutter.
while(exporting){
await new Promise(r=>setTimeout(r,300));
if(id !== loadSeq){ v.removeAttribute("src"); return; }
}
const c=document.createElement("canvas"); c.width=cw; c.height=ch;
strip.appendChild(c);
try{
v.currentTime = Math.min(total-0.03, (i+0.5)*total/N);
await Promise.race([once(v,"seeked"), new Promise(r=>setTimeout(r,1500))]);
const cx=c.getContext("2d",{alpha:false});
cx.imageSmoothingEnabled=true; cx.imageSmoothingQuality="high";
cx.drawImage(v, ox, oy, dw, dh);
}catch(e){}
}
v.removeAttribute("src");
}
/* ---------------- transport ---------------- */
$("playBtn").addEventListener("click", togglePlay);
function togglePlay(){
if(exporting) return;
if(V.paused){ if(V.currentTime<inT-0.01||V.currentTime>=outT-0.01) V.currentTime=inT; V.play(); }
else V.pause();
}
V.addEventListener("play", ()=>$("playBtn").innerHTML="❙❙");
V.addEventListener("pause",()=>$("playBtn").innerHTML="▶");
V.addEventListener("timeupdate", update);
V.addEventListener("seeked", update);
function rafLoop(){
if(!V.paused && !exporting){
if(V.currentTime>=outT-0.02){ if(looping){ V.currentTime=inT; } else { V.pause(); V.currentTime=outT; } }
update();
}
requestAnimationFrame(rafLoop);
}
requestAnimationFrame(rafLoop);
$("prevF").addEventListener("click", ()=>step(-1));
$("nextF").addEventListener("click", ()=>step(1));
function step(dir, big){
V.pause();
const d = big ? 1 : 1/(srcFps||30);
V.currentTime = clamp(V.currentTime + dir*d, 0, dur);
}
/* Setting a start later than the current end used to clamp the start back onto
the end. Marking a new clip after the previous one is the normal way to work,
so the other mark gets out of the way instead. */
function setIn(t){
inT = clamp(t, 0, Math.max(0, dur-0.02));
if(outT <= inT + 0.02) outT = dur; // start moved past the end — open the end up
refresh();
}
function setOut(t){
outT = clamp(t, 0.02, dur);
if(inT >= outT - 0.02) inT = 0; // end moved before the start — open the start up
refresh();
}
$("setIn").addEventListener("click", ()=>setIn(V.currentTime));
$("setOut").addEventListener("click", ()=>setOut(V.currentTime));
$("resetSel").addEventListener("click", ()=>{ if(picMode){ clearSnaps(); return; } inT=0; outT=dur; refresh(); });
$("loopBtn").addEventListener("click", e=>{ looping=!looping; e.target.textContent="Loop: "+(looping?"on":"off"); e.target.classList.toggle("ghost",!looping); });
/* ---------------- click-to-type time fields ---------------- */
function parseTime(s){ // "1:23.4", "0:05", "83.4", "1:02:03"
s = String(s).trim(); if(!s) return null;
const parts = s.split(":").map(x=>parseFloat(x));
if(parts.some(x=>isNaN(x))) return null;
return parts.reduce((a,x)=>a*60+x, 0);
}
function makeTimeEditor(el, get, set){
el.addEventListener("click", function(e){
e.stopPropagation();
if(exporting || el.querySelector("input")) return;
const inp = document.createElement("input");
inp.value = tc(get()); el.textContent=""; el.appendChild(inp);
inp.focus(); inp.select();
let done=false;
const commit = ok => {
if(done) return; done=true;
const v = ok ? parseTime(inp.value) : null;
inp.remove();
if(v !== null && isFinite(v)) set(v);
refresh();
};
inp.addEventListener("blur", ()=>commit(true));
inp.addEventListener("click", ev=>ev.stopPropagation());
inp.addEventListener("keydown", ev=>{
ev.stopPropagation();
if(ev.key==="Enter"){ ev.preventDefault(); commit(true); }
if(ev.key==="Escape"){ ev.preventDefault(); commit(false); }
});
});
}
makeTimeEditor($("pIn"), ()=>inT, v=>{ setIn(v); V.currentTime=inT; });
makeTimeEditor($("pOut"), ()=>outT, v=>{ setOut(v); V.currentTime=outT; });
makeTimeEditor($("pDur"), ()=>outT-inT, v=>{
const len = clamp(v, 0.02, dur);
if(inT + len <= dur){ outT = inT + len; }
else { outT = dur; inT = Math.max(0, dur - len); }
V.currentTime = inT;
});
document.addEventListener("keydown", e=>{
if(exporting) return;
const t=e.target.tagName;
if(t==="INPUT"||t==="SELECT"||t==="TEXTAREA") return;
const k=e.key;
if(k===" "){ e.preventDefault(); togglePlay(); }
else if(k==="ArrowLeft"){ e.preventDefault(); step(-1, e.shiftKey); }
else if(k==="ArrowRight"){ e.preventDefault(); step(1, e.shiftKey); }
else if(k==="i"||k==="I"){ setIn(V.currentTime); }
else if(k==="o"||k==="O"){ setOut(V.currentTime); }
else if(k==="a"||k==="A"){ e.preventDefault(); picMode ? addSnap() : addClip(); }
else if(k==="c"||k==="C"){ e.preventDefault(); toggleCrop(); }
// holding Shift turns "[" into "{" on most layouts, so accept both
else if(k==="["||k==="{"){ e.preventDefault(); nudge(e.shiftKey ? -1 : -1/(srcFps||30)); }
else if(k==="]"||k==="}"){ e.preventDefault(); nudge(e.shiftKey ? 1 : 1/(srcFps||30)); }
else if(k==="s"||k==="S"){ e.preventDefault(); takeSnapshot(); }
else if(k==="Home"){ V.currentTime=inT; }
else if(k==="End"){ V.currentTime=outT; }
});
/* ---------------- timeline drag ---------------- */
const tl=$("tl");
function posToTime(clientX){
const r=tl.getBoundingClientRect();
return clamp((clientX-r.left)/r.width,0,1)*dur;
}
tl.addEventListener("pointerdown", e=>{
if(exporting||!dur) return;
if(e.target===$("hIn")) dragging="in";
else if(e.target===$("hOut")) dragging="out";
else { dragging="seek"; V.pause(); V.currentTime=posToTime(e.clientX); }
tl.setPointerCapture(e.pointerId);
});
tl.addEventListener("pointermove", e=>{
if(!dragging) return;
const t=posToTime(e.clientX);
if(dragging==="in"){ inT=clamp(t,0,outT-0.02); V.currentTime=inT; }
else if(dragging==="out"){ outT=clamp(t,inT+0.02,dur); V.currentTime=outT; }
else V.currentTime=t;
refresh();
});
["pointerup","pointercancel"].forEach(ev=>tl.addEventListener(ev,()=>dragging=null));
function refresh(){
const a = dur? inT/dur*100 : 0, b = dur? outT/dur*100 : 100;
$("maskL").style.left="0"; $("maskL").style.width=a+"%";
$("maskR").style.left=b+"%"; $("maskR").style.width=(100-b)+"%";
$("sel").style.left=a+"%"; $("sel").style.width=(b-a)+"%";
$("hIn").style.left=a+"%"; $("hOut").style.left=b+"%";
if(activeSeg>=0){ // highlight only while the selection still matches
const sg=segments[activeSeg];
if(!sg || Math.abs(sg.start-inT)>0.001 || Math.abs(sg.end-outT)>0.001) activeSeg=-1;
}
if(!$("pIn").querySelector("input")) $("pIn").textContent=tc(inT);
if(!$("pOut").querySelector("input")) $("pOut").textContent=tc(outT);
if(!$("pDur").querySelector("input")) $("pDur").textContent=tc(outT-inT);
renderClips(); renderSnaps(); renderBand(); renderSnapBand(); renderShift(); estimate();
}
function update(){
$("curTime").textContent=tc(V.currentTime);
$("ph").style.left=(dur? V.currentTime/dur*100 : 0)+"%";
}
/* ---------------- shift the whole selection ----------------
Moves the start and end together so the length stays put. If the selection
currently matches a saved clip, that clip moves with it. */
const shiftBar=$("shiftBar"), shiftBlk=$("shiftBlk");
let shiftDrag=null;
function renderShift(){
if(!dur) return;
shiftBlk.style.left=(inT/dur*100)+"%";
shiftBlk.style.width=(Math.max(0.3,(outT-inT)/dur*100))+"%";
$("shiftLbl").innerHTML = (activeSeg>=0 && segments[activeSeg])
? "Shift <b>clip "+(activeSeg+1)+"</b> · "+tc(outT-inT)
: "Shift selection · "+tc(outT-inT);
}
function shiftTo(newStart){
const len = outT-inT;
const a = clamp(newStart, 0, Math.max(0, dur-len));
inT = a; outT = a+len;
if(activeSeg>=0 && segments[activeSeg]){ // carry the saved clip along
segments[activeSeg].start = inT;
segments[activeSeg].end = outT;
}
V.currentTime = inT;
refresh();
}
function nudge(sec){ if(!exporting && dur) shiftTo(inT+sec); }
shiftBar.addEventListener("pointerdown", e=>{
if(exporting || !dur) return;
e.preventDefault();
const r=shiftBar.getBoundingClientRect();
if(e.target !== shiftBlk){ // clicked the track — centre the block there
shiftTo(clamp((e.clientX-r.left)/r.width,0,1)*dur - (outT-inT)/2);
}
shiftDrag={px:e.clientX, start:inT, w:r.width};
shiftBar.setPointerCapture(e.pointerId);
});
shiftBar.addEventListener("pointermove", e=>{
if(!shiftDrag) return;
shiftTo(shiftDrag.start + (e.clientX-shiftDrag.px)/shiftDrag.w*dur);
});
["pointerup","pointercancel"].forEach(ev=>shiftBar.addEventListener(ev, ()=>shiftDrag=null));
$("shiftBtns").addEventListener("click", e=>{
const b=e.target.closest("button"); if(!b) return;
const d=b.dataset.d, f=1/(srcFps||30);
nudge(d==="f" ? f : d==="-f" ? -f : parseFloat(d));
});
/* ---------------- manual storyboard frames ---------------- */
let snaps=[], snapId=0;
function msGrid(){
return {c: clamp(Math.round(+$("msCols").value||3),1,10),
r: clamp(Math.round(+$("msRows").value||3),1,10)};
}
const SNAP_MAX = 25;
function makeThumb(){
const t = targets();
const w = 56, h = Math.max(12, Math.round(w * t.h / t.w));
const c = document.createElement("canvas");
c.width = w*2; c.height = h*2; // 2x so it stays sharp
c.className = "cthumb"; c.style.width = w+"px"; c.style.height = h+"px";
const x = c.getContext("2d", {alpha:false});
x.imageSmoothingEnabled = true; x.imageSmoothingQuality = "high";
try{ drawSource(x, c.width, c.height); }catch(e){}
return c;
}
function addSnap(){
if(exporting || !dur) return;
if(snaps.length >= SNAP_MAX){
setStatus("That's the limit — "+SNAP_MAX+" snapshots in a manual storyboard.");
return;
}
// pressing A twice without moving would just repeat the same frame
const last = snaps[snaps.length-1];
if(last && Math.abs(last.t - V.currentTime) < 0.001){
setStatus("That's the same frame as snapshot "+snaps.length+" — move the playhead first.");
return;
}
snaps.push({id:++snapId, t:V.currentTime, thumb:makeThumb()});
// grow the grid so every frame you take has somewhere to go
let {c,r} = msGrid();
while(c*r < snaps.length && r < 10) r++;
while(c*r < snaps.length && c < 10) c++;
$("msCols").value=c; $("msRows").value=r;
setStatus("");
refresh();
}
function clearSnaps(){
if(exporting || !snaps.length) return;
if(snaps.length>1 && !confirm("Remove all "+snaps.length+" snapshots?")) return;
snaps=[]; refresh();
}
$("clearSnaps").addEventListener("click", clearSnaps);
function renderSnaps(){
const wrap=$("snapsWrap"), list=$("snapList");
wrap.style.display = (picMode && snaps.length) ? "block" : "none";
// taking snapshots swaps the auto storyboard out for the manual one
$("autoSbSec").style.display = snaps.length ? "none" : "block";
$("manSbSec").style.display = snaps.length ? "block" : "none";
$("snapsTitle").textContent = "Snapshots ("+snaps.length+" of "+SNAP_MAX+")";
if(!picMode || !snaps.length){ list.innerHTML=""; return; }
if(list.querySelector("input:focus")) return;
const {c,r} = msGrid(), cells = c*r;
list.innerHTML="";
snaps.forEach((sn,i)=>{
const row=document.createElement("div");
row.className="crow"+(i>=cells?" over":"");
const num=document.createElement("span"); num.className="cnum"; num.textContent=(i+1);
const spacer=document.createElement("span"); spacer.className="cname";
if(sn.thumb) spacer.appendChild(sn.thumb);
const times=document.createElement("span"); times.className="ctimes";
const bT=document.createElement("b"); bT.className="edit"; bT.textContent=tc(sn.t);
times.appendChild(bT);
makeTimeEditor(bT, ()=>sn.t, v=>{ sn.t = clamp(v, 0, dur); });
const note=document.createElement("span"); note.className="cdur";
note.textContent = i>=cells ? "no cell" : "";
const btns=document.createElement("span"); btns.className="cbtns";
const go=document.createElement("button");
go.textContent="▶"; go.title="Jump to this frame";
go.addEventListener("click", ev=>{ ev.stopPropagation(); if(!exporting) V.currentTime=sn.t; });
const use=document.createElement("button");
use.textContent="Set"; use.title="Move this snapshot to where the playhead is now";
use.addEventListener("click", ev=>{ ev.stopPropagation(); if(exporting) return; sn.t=V.currentTime; refresh(); });
const del=document.createElement("button");
del.textContent="✕"; del.title="Remove"; del.className="danger";
del.addEventListener("click", ev=>{ ev.stopPropagation(); if(exporting) return;
snaps.splice(i,1); refresh(); });
btns.appendChild(go); btns.appendChild(use); btns.appendChild(del);
row.appendChild(num); row.appendChild(spacer); row.appendChild(times);
row.appendChild(note); row.appendChild(btns);
row.addEventListener("click", ()=>{ if(!exporting) V.currentTime=sn.t; });
list.appendChild(row);
});
}
function renderSnapBand(){
if(!picMode || !dur) return;
const band=$("segBand");
snaps.forEach((sn,i)=>{
const el=document.createElement("div");
el.className="segbar"; el.style.left=(sn.t/dur*100)+"%";
el.style.width="0"; el.style.minWidth="3px"; el.textContent="";
band.appendChild(el);
});
}
/* ---------------- clip list ---------------- */
$("addClip").addEventListener("click", ()=> picMode ? addSnap() : addClip());
function addClip(){
if(exporting || !dur) return;
if(outT - inT < 0.05){ setStatus("Selection is too short to add."); return; }
segments.push({id:++segId, start:inT, end:outT, name:""});
// Leave the selection unlinked so the shift bar positions the NEXT clip
// rather than dragging the one you just saved. Click a row to link it.
activeSeg = -1;
setStatus("");
refresh();
}
$("clearClips").addEventListener("click", ()=>{
if(exporting || !segments.length) return;
if(segments.length>1 && !confirm("Remove all "+segments.length+" clips from the list?")) return;
segments=[]; activeSeg=-1; refresh();
});
function renderClips(){
const wrap=$("clipsWrap"), list=$("clipList");
wrap.style.display = (!picMode && segments.length) ? "block" : "none";
if(picMode){ list.innerHTML=""; return; }
$("clipsTitle").textContent = "Clip list ("+segments.length+")";
if(!segments.length){ list.innerHTML=""; return; }
if(list.querySelector("input:focus")) return; // don't yank a field being typed in
list.innerHTML="";
segments.forEach((s,i)=>{
const row=document.createElement("div");
row.className="crow"+(i===activeSeg?" on":"");
const num=document.createElement("span"); num.className="cnum"; num.textContent=(i+1);
const nameWrap=document.createElement("span"); nameWrap.className="cname";
const name=document.createElement("input");
name.type="text"; name.value=s.name||""; name.placeholder="name (optional)"; name.maxLength=40;
name.addEventListener("input", ()=>{ s.name=name.value; });
name.addEventListener("keydown", ev=>{ ev.stopPropagation(); if(ev.key==="Enter") name.blur(); });
name.addEventListener("click", ev=>ev.stopPropagation());
nameWrap.appendChild(name);
const times=document.createElement("span"); times.className="ctimes";
const bS=document.createElement("b"); bS.className="edit"; bS.textContent=tc(s.start);
const bE=document.createElement("b"); bE.className="edit"; bE.textContent=tc(s.end);
times.appendChild(bS); times.appendChild(document.createTextNode(" → ")); times.appendChild(bE);
makeTimeEditor(bS, ()=>s.start, v=>{ s.start = clamp(v, 0, s.end-0.02); });
makeTimeEditor(bE, ()=>s.end, v=>{ s.end = clamp(v, s.start+0.02, dur); });
const d=document.createElement("span"); d.className="cdur"; d.textContent=tc(s.end-s.start);
const btns=document.createElement("span"); btns.className="cbtns";
const prev=document.createElement("button");
prev.textContent="▶"; prev.title="Load this clip onto the timeline and play it";
prev.addEventListener("click", ev=>{ ev.stopPropagation();
if(exporting) return;
activeSeg=i; inT=s.start; outT=s.end; V.currentTime=s.start; refresh();
V.play().catch(()=>{}); });
const use=document.createElement("button");
use.textContent="Set"; use.title="Replace this clip's start and end with the current timeline selection";
use.addEventListener("click", ev=>{ ev.stopPropagation();
if(exporting) return;
s.start=inT; s.end=outT; activeSeg=i; refresh(); });
const del=document.createElement("button");
del.textContent="✕"; del.title="Remove this clip"; del.className="danger";
del.addEventListener("click", ev=>{ ev.stopPropagation();
if(exporting) return;
segments.splice(i,1);
if(activeSeg>=segments.length) activeSeg=segments.length-1;
refresh(); });
btns.appendChild(prev); btns.appendChild(use); btns.appendChild(del);
row.appendChild(num); row.appendChild(nameWrap); row.appendChild(times);
row.appendChild(d); row.appendChild(btns);
row.addEventListener("click", ()=>{ // preview this clip on the timeline
if(exporting) return;
activeSeg=i; inT=s.start; outT=s.end; V.currentTime=s.start; refresh();
});
list.appendChild(row);
});
}
function renderBand(){
const band=$("segBand"); band.innerHTML="";
if(!dur) return;
segments.forEach((s,i)=>{
const el=document.createElement("div");
el.className="segbar"+(i===activeSeg?" on":"");
el.style.left=(s.start/dur*100)+"%";
el.style.width=Math.max(0.4,(s.end-s.start)/dur*100)+"%";
el.textContent=(i+1);
band.appendChild(el);
});
}
/* the list is what gets exported; with an empty list it's just the selection */
function exportList(){
return segments.length ? segments.map(s=>({start:s.start,end:s.end,name:s.name}))
: [{start:inT,end:outT,name:""}];
}
function totalLen(){ return exportList().reduce((a,s)=>a+Math.max(0,s.end-s.start),0); }
/* ---------------- crop ----------------
Held in source pixels so it survives any output size change. Everything that
sizes the output asks srcW()/srcH() rather than the video's own dimensions. */
let crop=null, cropAR=0, cropARLabel="free", curScale=1;
function srcW(){ return crop ? crop.w : natW; }
function srcH(){ return crop ? crop.h : natH; }
/* The crop box is stored in source pixels, measured against the size the video
reported when it loaded. Some files don't have their real size ready at
loadedmetadata, so natW/natH can be stuck on the 640x360 fallback — and a crop
rectangle in the wrong coordinate space lands outside the real frame. When
that happens drawImage draws nothing at all: no error, no warning, just a
black clip at full bitrate. Clamping against the live size stops it. */
function liveW(){ return V.videoWidth || natW || 640; }
function liveH(){ return V.videoHeight || natH || 360; }
function cropRect(){
if(!crop) return null;
const sw=liveW(), sh=liveH();
const x=clamp(Math.round(crop.x), 0, Math.max(0,sw-2));
const y=clamp(Math.round(crop.y), 0, Math.max(0,sh-2));
return {x, y, w:clamp(Math.round(crop.w),2,sw-x), h:clamp(Math.round(crop.h),2,sh-y)};
}
function drawSource(dctx, dw, dh){
dctx.imageSmoothingEnabled=true; dctx.imageSmoothingQuality="high";
const c = cropRect();
if(c) dctx.drawImage(V, c.x, c.y, c.w, c.h, 0, 0, dw, dh);
else dctx.drawImage(V, 0, 0, dw, dh);
}
/* A video element fires "resize" when its intrinsic size first becomes known or
changes. Nothing was listening, so a file that reported nothing useful at
loadedmetadata kept the fallback size for the whole session. */
V.addEventListener("resize", ()=>{
const w=V.videoWidth, h=V.videoHeight;
if(!w || !h || !loadedOnce || (w===natW && h===natH)) return;
const sx = natW ? w/natW : 1, sy = natH ? h/natH : 1;
natW=w; natH=h;
if(crop){ crop={x:crop.x*sx, y:crop.y*sy, w:crop.w*sx, h:crop.h*sy}; cropChanged(true); }
$("srcBadge").textContent = natW+"\u00d7"+natH+" \u00b7 "+Math.round(srcFps)+" fps \u00b7 "+tc(dur,false);
layoutCrop(); estimate();
});
/* Is what we just drew completely black? Used as a safety net so a blank export
gets reported instead of quietly handed over as a finished file. */
function canvasIsBlank(c){
try{
if(!probeCv){
probeCv=document.createElement("canvas"); probeCv.width=24; probeCv.height=14;
probeCtx=probeCv.getContext("2d",{willReadFrequently:true});
}
probeCtx.drawImage(c, 0, 0, 24, 14);
const d=probeCtx.getImageData(0,0,24,14).data;
for(let i=0;i<d.length;i+=4) if(d[i]>8||d[i+1]>8||d[i+2]>8) return false;
return true;
}catch(e){ return false; }
}
/* ---------------- seeking that actually lands ----------------
The black-first-frame bug: `seeked` only promises the video has moved, not
that a picture is ready. Draw straight after it and the decoder can still be
empty, which paints as black. Three things fix it — wait for a frame to be
presented rather than just for the seek, handle the case where the video was
already parked on the wanted time (no `seeked` ever fires), and check the
result isn't blank before accepting it. */
let probeCv=null, probeCtx=null, probeDead=false;
function frameIsBlank(){
if(probeDead || !V.videoWidth) return false;
try{
if(!probeCv){
probeCv = document.createElement("canvas"); probeCv.width=24; probeCv.height=14;
probeCtx = probeCv.getContext("2d", {willReadFrequently:true});
}
probeCtx.drawImage(V, 0, 0, 24, 14);
const d = probeCtx.getImageData(0,0,24,14).data;
let mx=0;
for(let i=0;i<d.length;i+=4){
const v = d[i]>d[i+1] ? (d[i]>d[i+2]?d[i]:d[i+2]) : (d[i+1]>d[i+2]?d[i+1]:d[i+2]);
if(v>mx){ mx=v; if(mx>=8) return false; }
}
return true;
}catch(e){ probeDead=true; return false; } // cross-origin video: can't look, don't try again
}
/* resolves once the next frame is on screen, or after a short wait */
function settleFrame(ms){
return new Promise(res=>{
let done=false;
const fin=()=>{ if(!done){ done=true; res(); } };
if("requestVideoFrameCallback" in HTMLVideoElement.prototype){
try{ V.requestVideoFrameCallback(fin); }catch(e){}
}
setTimeout(fin, ms||90);
});
}
async function seekTo(time){
const target = clamp(time, 0, Math.max(0, dur-0.001));
const already = Math.abs(V.currentTime - target) < 1e-4;
if(V.readyState < 2) await Promise.race([once(V,"loadeddata"), new Promise(r=>setTimeout(r,3000))]);
V.currentTime = target;
if(!already) await Promise.race([once(V,"seeked"), new Promise(r=>setTimeout(r,3000))]);
await settleFrame();
// A frame that is blank because the decoder is behind fills in if you wait.
// One that is blank because the video really is black stays blank, so give up
// after two tries rather than stalling on a fade-in.
for(let i=0;i<2 && frameIsBlank();i++) await settleFrame(110);
}
function videoBox(){
const st=$("stage").getBoundingClientRect(), v=V.getBoundingClientRect();
return {left:v.left-st.left, top:v.top-st.top, w:v.width, h:v.height};
}
function layoutCrop(){
if(!crop || !natW) return;
const L=$("cropLayer"), b=videoBox();
if(!b.w || !b.h) return;
L.style.left=b.left+"px"; L.style.top=b.top+"px";
L.style.width=b.w+"px"; L.style.height=b.h+"px";
const sx=b.w/natW, sy=b.h/natH, B=$("cropBox");
B.style.left=(crop.x*sx)+"px"; B.style.top=(crop.y*sy)+"px";
B.style.width=(crop.w*sx)+"px"; B.style.height=(crop.h*sy)+"px";
$("cropDims").textContent = Math.round(crop.w)+" × "+Math.round(crop.h);
}
function cropChanged(finalise){
if(crop){
crop.x=Math.max(0,Math.round(crop.x)); crop.y=Math.max(0,Math.round(crop.y));
crop.w=Math.min(Math.round(crop.w), natW-crop.x);
crop.h=Math.min(Math.round(crop.h), natH-crop.y);
}
layoutCrop();
$("cropInfo").textContent = crop
? "Keeping "+crop.w+" × "+crop.h+" ("+cropARLabel+") out of "+natW+" × "+natH+" · drag the box or its handles"
: "";
if(finalise){ // only resize the output once the drag ends
if(curScale){ W.value=even(srcW()*curScale); H.value=even(srcH()*curScale); markScale(curScale); }
else if(lock.checked){ H.value=even((+W.value||srcW())*srcH()/srcW()); }
}
estimate();
}
function setCrop(x,y,w,h){
w=Math.max(16,Math.min(w,natW)); h=Math.max(16,Math.min(h,natH));
crop={x:clamp(x,0,natW-w), y:clamp(y,0,natH-h), w, h};
}
function snapToAR(ar){
if(!ar || !crop) return;
const cx=crop.x+crop.w/2, cy=crop.y+crop.h/2;
let w=Math.min(natW, Math.max(crop.w, crop.h*ar)), h=w/ar;
if(h>natH){ h=natH; w=h*ar; }
setCrop(cx-w/2, cy-h/2, w, h);
}
function biggestFit(ar){
let w=natW, h=natW/(ar||natW/natH);
if(h>natH){ h=natH; w=h*(ar||natW/natH); }
setCrop((natW-w)/2, (natH-h)/2, w, h);
}
function showCrop(on){
$("cropLayer").style.display = on ? "block" : "none";
$("cropSection").style.display = on ? "block" : "none";
$("cropBtn").classList.toggle("on", on);
}
$("cropBtn").addEventListener("click", toggleCrop);
function toggleCrop(){
if(exporting || !dur) return;
if(crop){ removeCrop(); return; }
if(cropAR) biggestFit(cropAR);
else setCrop(natW*0.1, natH*0.1, natW*0.8, natH*0.8);
showCrop(true); markAR(); cropChanged(true);
}
function removeCrop(){
crop=null; cropAR=0; cropARLabel="free";
showCrop(false);
if(curScale){ W.value=even(natW*curScale); H.value=even(natH*curScale); markScale(curScale); }
$("cropInfo").textContent="";
estimate();
}
$("cropMax").addEventListener("click", ()=>{ if(!crop) return; biggestFit(cropAR||natW/natH); cropChanged(true); });
function applyAR(ar, label){
cropAR = ar; cropARLabel = label;
markAR();
if(cropAR) snapToAR(cropAR);
cropChanged(true);
}
document.querySelectorAll(".arRow").forEach(row=>{
row.addEventListener("click", e=>{
const b=e.target.closest("button"); if(!b || !crop) return;
const v=b.dataset.ar;
applyAR(v==="src" ? natW/natH : parseFloat(v), v==="src" ? "original" : b.dataset.lbl);
});
});
function useCustomAR(){
if(!crop) return;
const a=+$("arW").value, b=+$("arH").value;
if(!(a>0) || !(b>0)){ $("arW").focus(); return; }
applyAR(a/b, a+":"+b);
}
$("arApply").addEventListener("click", useCustomAR);
["arW","arH"].forEach(id=>$(id).addEventListener("keydown", e=>{
e.stopPropagation();
if(e.key==="Enter"){ e.preventDefault(); useCustomAR(); }
}));
function markAR(){
let matched=false;
document.querySelectorAll(".arRow button").forEach(b=>{
const v=b.dataset.ar, val = v==="src" ? (natW/natH) : parseFloat(v);
const on = (!cropAR && v==="0") || (cropAR>0 && Math.abs(val-cropAR) < 0.004);
b.classList.toggle("on", on);
if(on) matched=true;
});
$("arCustom").classList.toggle("on", !matched && cropAR>0);
}
let cropDrag=null;
$("cropLayer").addEventListener("pointerdown", e=>{
const h=e.target.dataset.h;
if(!h || exporting || !crop) return;
e.preventDefault();
const b=videoBox();
cropDrag={h, s:{...crop}, px:e.clientX, py:e.clientY, sx:b.w/natW, sy:b.h/natH};
$("cropLayer").setPointerCapture(e.pointerId);
});
$("cropLayer").addEventListener("pointermove", e=>{
if(!cropDrag) return;
const dx=(e.clientX-cropDrag.px)/cropDrag.sx, dy=(e.clientY-cropDrag.py)/cropDrag.sy;
const s=cropDrag.s, H=cropDrag.h, ar=cropAR;
if(H==="move"){
setCrop(s.x+dx, s.y+dy, s.w, s.h);
}else if(ar){
if(H==="n"||H==="s"){
let hh = H==="n" ? s.h-dy : s.h+dy;
hh=Math.max(16,Math.min(hh,natH)); let ww=hh*ar;
if(ww>natW){ ww=natW; hh=ww/ar; }
const cx=s.x+s.w/2, y = H==="n" ? (s.y+s.h)-hh : s.y;
setCrop(cx-ww/2, y, ww, hh);
}else if(H==="e"||H==="w"){
let ww = H==="w" ? s.w-dx : s.w+dx;
ww=Math.max(16,Math.min(ww,natW)); let hh=ww/ar;
if(hh>natH){ hh=natH; ww=hh*ar; }
const cy=s.y+s.h/2, x = H==="w" ? (s.x+s.w)-ww : s.x;
setCrop(x, cy-hh/2, ww, hh);
}else{ // corner: opposite corner stays put
const west=H.indexOf("w")>=0, north=H.indexOf("n")>=0;
const ax = west ? s.x+s.w : s.x, ay = north ? s.y+s.h : s.y;
const availW = west ? ax : natW-ax, availH = north ? ay : natH-ay;
let ww = Math.max(west ? s.w-dx : s.w+dx, (north ? s.h-dy : s.h+dy)*ar);
ww = Math.max(16, Math.min(ww, availW, availH*ar));
const hh = ww/ar;
setCrop(west ? ax-ww : ax, north ? ay-hh : ay, ww, hh);
}
}else{
let l=s.x, tp=s.y, r=s.x+s.w, bt=s.y+s.h;
if(H.indexOf("w")>=0) l=clamp(s.x+dx, 0, r-16);
if(H.indexOf("e")>=0) r=clamp(s.x+s.w+dx, l+16, natW);
if(H.indexOf("n")>=0) tp=clamp(s.y+dy, 0, bt-16);
if(H.indexOf("s")>=0) bt=clamp(s.y+s.h+dy, tp+16, natH);
setCrop(l, tp, r-l, bt-tp);
}
cropChanged(false);
});
["pointerup","pointercancel"].forEach(ev=>$("cropLayer").addEventListener(ev, ()=>{
if(cropDrag){ cropDrag=null; cropChanged(true); }
}));
window.addEventListener("resize", layoutCrop);
if(window.ResizeObserver) new ResizeObserver(layoutCrop).observe($("stage"));
V.addEventListener("loadeddata", layoutCrop);
/* ---------------- size ---------------- */
const W=$("w"), H=$("h"), lock=$("lockAr");
$("scaleSeg").addEventListener("click", e=>{
const b=e.target.closest("button"); if(!b) return;
const s=parseFloat(b.dataset.s);
W.value=even(srcW()*s); H.value=even(srcH()*s); markScale(s); estimate();
});
function markScale(s){
curScale = s;
[...$("scaleSeg").children].forEach(b=>b.classList.toggle("on", parseFloat(b.dataset.s)===s));
}
W.addEventListener("input", ()=>{ if(lock.checked && srcW()) H.value=even(W.value*srcH()/srcW()); markScale(null); estimate(); });
H.addEventListener("input", ()=>{ if(lock.checked && srcH()) W.value=even(H.value*srcW()/srcH()); markScale(null); estimate(); });
/* ---------------- fps ---------------- */
function buildFpsSeg(){
const seg=$("fpsSeg"); seg.innerHTML="";
const opts=[Math.round(srcFps),60,30,24,15,12].filter((v,i,a)=>v<=Math.max(60,Math.round(srcFps))&&a.indexOf(v)===i);
opts.forEach(f=>{
const b=document.createElement("button");
b.textContent = (f===Math.round(srcFps)? "Same ("+f+")" : f);
b.dataset.f=f;
b.addEventListener("click",()=>{ $("fps").value=f; markFps(); estimate(); });
seg.appendChild(b);
});
markFps();
}
function markFps(){
const f=+$("fps").value;
[...$("fpsSeg").children].forEach(b=>b.classList.toggle("on", +b.dataset.f===f));
}
$("fps").addEventListener("input", ()=>{ markFps(); estimate(); });
/* ---------------- collapsible sections ---------------- */
$("sizeHead").addEventListener("click", ()=>{
const open = $("sizeHead").classList.toggle("open");
$("sizeHead").classList.toggle("shut", !open);
$("sizeBody").style.display = open ? "block" : "none";
});
/* ---------------- tabs ---------------- */
let picMode = false;
$("tabs").addEventListener("click", e=>{
const b=e.target.closest("button"); if(!b) return;
const t=b.dataset.tab;
[...$("tabs").children].forEach(x=>x.classList.toggle("on", x===b));
$("tabVideo").style.display = t==="video" ? "block" : "none";
$("tabPic").style.display = t==="pic" ? "block" : "none";
picMode = (t==="pic");
syncMode();
});
/* The two buttons under the timeline do different jobs depending on the tab:
clips for video, individual frames for the manual storyboard. */
function syncMode(){
$("addClip").innerHTML = (picMode ? "+ Add snapshot" : "+ Add clip")
+ ' <span class="kbd" style="background:rgba(0,0,0,.15);border-color:rgba(0,0,0,.25)">A</span>';
$("resetSel").textContent = picMode ? "Reset storyboard" : "Reset to full clip";
$("keyA").textContent = picMode ? "add snapshot" : "add clip";
refresh();
}
/* ---------------- compression / estimate ---------------- */
$("q").addEventListener("input", estimate);
$("cfr").addEventListener("change", ()=>{ if(!$("cfr").checked) $("h3").checked=false; estimate(); });
$("h3").addEventListener("change", ()=>{ if($("h3").checked) $("cfr").checked=true; estimate(); });
$("keepAudio").addEventListener("change", estimate);
["sbCols","sbRows","imgMax","msCols","msRows"].forEach(id=>$(id).addEventListener("input", ()=>{ estimate(); renderSnaps(); }));
/* bits per pixel per frame. The browser's recorder is a realtime encoder, so it
needs noticeably more bitrate than an offline one to look the same. At the
78 default the curve gives 0.30 bpp, which is 8.3 Mbps for 720p30 and
18.7 Mbps for 1080p30. (The old comment here said 7 and 16 — it was written
against an earlier curve and no longer matched the maths.) */
function qualityBpp(){
const q=+$("q").value/100;
return 0.035 * Math.pow(0.55/0.035, q); // 0.035 → 0.55
}
function targets(){
const w=even(clamp(+W.value||srcW(),16,7680)), h=even(clamp(+H.value||srcH(),16,4320));
const f=clamp(+$("fps").value||Math.round(srcFps),1,120);
const bitrate=Math.round(clamp(w*h*f*qualityBpp(), 250000, 120000000));
return {w,h,f,bitrate};
}
/* ---------------- fixed frame rate ----------------
Off, the browser samples the canvas whenever it feels like it, so frame
spacing wanders. On, we hand the recorder one frame at a time on a wall-clock
schedule and count them, which also makes an exact frame count possible. */
function cfrOn(){ return $("cfr").checked || $("h3").checked; }
/* H3 wants 17n+5 frames in total: 5, 22, 39, 56, 73, 90 ... */
function h3Snap(f){ return 17*Math.max(0, Math.ceil((f-5)/17)) + 5; }
/* How many frames a clip should contain, and how long it has to run to hold
them. Padding comes from real video after the out point, so it is capped by
what is actually left in the file — if there isn't room we drop to the next
valid count down rather than inventing frames. */
function frameFit(start, end){
const fps = targets().f;
let frames = Math.max(1, Math.round(Math.max(0, end-start)*fps));
let short = false;
if($("h3").checked){
let want = h3Snap(frames);
const room = Math.floor(Math.max(0, dur-start)*fps);
while(want > room && want > 5){ want -= 17; short = true; }
frames = Math.max(1, want);
}
return {fps, frames, len: frames/fps, short};
}
/* What actually gets written, not what was selected. With a fixed frame rate
the range is stretched (or clipped) to hold a whole number of frames, so the
old estimate quietly used the wrong length. */
function exportLen(){
const list = exportList();
if(!cfrOn()) return list.reduce((a,s)=>a+Math.max(0,s.end-s.start),0);
return list.reduce((a,s)=>a+frameFit(s.start, s.end).len, 0);
}
/* Container overhead — headers, the cue index, and a packet header per frame.
Small, but it was missing entirely, and it grows with the frame rate. */
function muxOverhead(f){ return 1.012 + Math.min(0.010, f/12000); }
function estBytes(){
const t = targets(), n = Math.max(1, exportList().length), len = exportLen();
const audio = wantAudio() ? 192000 : 0; // what the recorder is asked for
return (t.bitrate + audio) * len / 8 * muxOverhead(t.f) + n*2048;
}
function estimate(){
const t=targets(), n=exportList().length, len=exportLen();
$("eSize").textContent = t.w+"×"+t.h;
$("eRate").textContent = (t.bitrate/1e6).toFixed(2)+" Mbps";
$("eBytesLbl").textContent = n>1 ? "Est. size, all "+n : "Est. file size";
$("eCodec").textContent = codecLabel();
$("eBytes").textContent = bytes(estBytes());
$("eTime").textContent = len<1 ? "—" : (len<60? Math.ceil(len)+" s" : Math.ceil(len/60)+" min");
if($("h3").checked) $("cfr").checked = true;
if(cfrOn()){
const seg = exportList()[0] || {start:inT, end:outT};
const ff = frameFit(seg.start, seg.end);
$("cfrHint").textContent = "Canvas repainted strictly on a "+ff.fps+" fps grid."
+ ($("h3").checked
? " " + (n>1?"First clip: ":"") + ff.frames + " frames ("+ff.len.toFixed(2)+" s"
+ (ff.short ? ", trimmed down — not enough video after the out point" : ", out point pushed out to suit")+")."
: "")
+ " The browser still does the encoding, so treat it as close rather than certain.";
}else{
$("cfrHint").textContent = "Off, the browser samples the canvas when it likes and the frame spacing varies a little.";
}
const q=+$("q").value;
$("qHint").textContent = (q<20?"Squeezed hard — smallest file, softest picture"
: q<40?"Well compressed — easy to email"
: q<60?"Balanced"
: q<80?"Light compression — larger file, crisper picture"
: "Barely compressed — largest file");
const gfit = fitWithin(t.w, t.h, imgCap());
$("imgMaxHint").textContent = "Pictures are scaled to fit inside this. A single frame comes out "
+ gfit.w + " × " + gfit.h + (gfit.scale<1 ? " (scaled down from "+t.w+" × "+t.h+")" : "") + ".";
$("sizeHint").textContent = (crop ? "Cropped to "+crop.w+"×"+crop.h+" (from "+natW+"×"+natH+")."
: "Source "+natW+"×"+natH+".")+" Width and height are rounded to even numbers.";
$("exportBtn").textContent = n>1 ? "Export "+n+" clips" : (segments.length===1 ? "Export 1 clip" : "Export clip");
$("gifBtn").textContent = n>1 ? "Export "+n+" GIFs" : "Export as GIF";
const g = sbGrid(), cell = sbCell(t, g.c, g.r), frames = g.c*g.r;
$("sbHint").textContent = frames+" frame"+(frames===1?"":"s")+" · sheet "
+ (g.c*cell.cw + (g.c-1)*SB_GAP) + " × " + (g.r*cell.ch + (g.r-1)*SB_GAP) + " px";
$("sbBtn").textContent = n>1 ? "Export "+n+" storyboards" : "Export storyboard";
const mg = msGrid(), mcell = sbCell(t, mg.c, mg.r), cells = mg.c*mg.r;
$("msHint").textContent = snaps.length
? snaps.length+" snapshot"+(snaps.length===1?"":"s")+" · "+cells+" cell"+(cells===1?"":"s")
+ (snaps.length>cells ? " · "+(snaps.length-cells)+" won't fit"
: snaps.length<cells ? " · "+(cells-snaps.length)+" left blank" : "")
+ " · sheet "+(mg.c*mcell.cw+(mg.c-1)*SB_GAP)+" × "+(mg.r*mcell.ch+(mg.r-1)*SB_GAP)+" px"
: "No snapshots yet — press + Add snapshot under the video.";
}
/* ---------------- recording engine ---------------- */
/* H.264 High profile first — Baseline (the old default) has no CABAC and no
B-frames, which is a big quality loss at the same bitrate. Level 5.2 so 4K
is inside the profile limits. */
const MIMES = [
"video/mp4;codecs=avc1.640034,mp4a.40.2", // High 5.2
"video/mp4;codecs=avc1.64002A,mp4a.40.2", // High 4.2
"video/mp4;codecs=avc1.4D402A,mp4a.40.2", // Main 4.2
"video/mp4;codecs=avc1.640034",
"video/mp4",
"video/webm;codecs=vp9,opus",
"video/webm;codecs=vp9",
"video/webm;codecs=vp8,opus",
"video/webm"
];
function pickMime(){
for(const m of MIMES) if(window.MediaRecorder && MediaRecorder.isTypeSupported(m)) return m;
return "";
}
/* isTypeSupported saying yes only means the string parses and the codecs exist.
It does not promise the encoder will actually run: Chrome 152 accepts
video/mp4;codecs=avc1.640034,mp4a.40.2 and then aborts the recorder a few
milliseconds after start on some machines. So keep the whole list and work
down it when one turns out not to record. */
function mimeChoices(){
if(!window.MediaRecorder) return [];
const out=[], seen=new Set();
for(const m of MIMES){
if(seen.has(m) || !MediaRecorder.isTypeSupported(m)) continue;
seen.add(m); out.push(m);
}
return out;
}
/* What to try after `failed` didn't record. When MP4 refuses, another H.264
profile is very likely to refuse the same way — the whole family goes through
one encoder. Cross to WebM first and only come back to the siblings after,
otherwise three retries get spent inside the family that already failed. */
function fallbackMimes(failed){
const fam = m => /mp4|avc1/.test(m) ? "mp4" : "webm";
const bad = fam(failed);
const rest = mimeChoices().filter(m => m !== failed);
return rest.filter(m => fam(m) !== bad).concat(rest.filter(m => fam(m) === bad));
}
function shortMime(m){
if(!m) return "another format";
if(/avc1|mp4/.test(m)) return "MP4";
if(/vp9/.test(m)) return "WebM (VP9)";
if(/vp8/.test(m)) return "WebM (VP8)";
return "WebM";
}
function codecLabel(){
const m = pickMime();
if(!m) return "none";
if(/avc1\.64/.test(m)) return "H.264 High";
if(/avc1\.4D/.test(m)) return "H.264 Main";
if(/avc1/.test(m)) return "H.264";
if(/mp4/.test(m)) return "MP4";
if(/vp9/.test(m)) return "VP9";
if(/vp8/.test(m)) return "VP8";
return m;
}
function wantAudio(){ const c=$("keepAudio"); return !c || c.checked; }
/* createMediaElementSource can only ever be called once for a given <video>.
The old version reset audioCtx to null on failure and then tried again on the
next export, where that second call always throws — so one bad run poisoned
audio for the rest of the session and clips came out with no audio track at
all. Once the element is attached, that fact is remembered. */
let audioAttached=false, audioWhy="";
function setupAudio(){
if(audioCtx || audioAttached) return;
try{
audioCtx = new (window.AudioContext||window.webkitAudioContext)();
mediaSrc = audioCtx.createMediaElementSource(V);
audioAttached = true;
monitorGain = audioCtx.createGain(); monitorGain.gain.value = 1;
mediaSrc.connect(monitorGain); monitorGain.connect(audioCtx.destination);
streamDest = audioCtx.createMediaStreamDestination();
mediaSrc.connect(streamDest);
}catch(e){
audioWhy = e && e.message ? e.message : String(e);
try{ if(audioCtx) audioCtx.close(); }catch(e2){}
audioCtx=null; streamDest=null; monitorGain=null;
}
}
/* records V from `a` to `z` onto the export canvas; resolves with {blob,ext,stalled,speed} */
/* A clock that keeps ticking when the tab is in the background.
The bug this fixes: the whole export used to run inside requestAnimationFrame.
Chrome stops firing rAF when a tab is hidden (or the window is fully covered),
so the canvas was never repainted and the "we've reached the end, stop now"
check never ran. Result: one frozen video frame plus audio, recording on until
the source video ended. Web Audio runs on a realtime thread the browser does
not throttle, so it drives things now; rAF and a timer are extra safety. */
function makeClock(fn){
const stops=[];
try{
if(audioCtx && audioCtx.createScriptProcessor){
const node = audioCtx.createScriptProcessor(1024, 1, 1); // ~21 ms, ~47 Hz
const mute = audioCtx.createGain(); mute.gain.value = 0;
node.onaudioprocess = ()=>fn();
node.connect(mute); mute.connect(audioCtx.destination);
stops.push(()=>{ node.onaudioprocess=null; try{ node.disconnect(); mute.disconnect(); }catch(e){} });
}
}catch(e){}
if(typeof requestAnimationFrame === "function"){
let alive=true, raf=0;
const loop=()=>{ if(!alive) return; fn(); raf=requestAnimationFrame(loop); };
raf=requestAnimationFrame(loop);
stops.push(()=>{ alive=false; try{ cancelAnimationFrame(raf); }catch(e){} });
}
const id=setInterval(fn, 60);
stops.push(()=>clearInterval(id));
return ()=>stops.forEach(f=>{ try{ f(); }catch(e){} });
}
let wakeLock=null;
async function keepAwake(on){
try{
if(on && navigator.wakeLock && !wakeLock){ wakeLock = await navigator.wakeLock.request("screen"); }
else if(!on && wakeLock){ await wakeLock.release(); wakeLock=null; }
}catch(e){ wakeLock=null; }
}
/* ---------------- export log ----------------
Three attempts at diagnosing an export fault from screenshots got it wrong,
so the export now records what it actually did. "Copy export log" in the
result panel puts it on the clipboard. */
let xlog=[], xt0=0;
function logStart(){ xlog=[]; xt0=performance.now(); }
function log(msg){
if(xlog.length>400) return;
xlog.push(((performance.now()-xt0)/1000).toFixed(3).padStart(8)+"s "+msg);
}
function logText(){
return ["Pocket Video Trimmer v3.6 export log",
"source "+natW+"x"+natH+" @"+Math.round(srcFps)+"fps, duration "+dur.toFixed(2)+"s",
"video element "+V.videoWidth+"x"+V.videoHeight+", readyState "+V.readyState,
"browser "+navigator.userAgent, ""].concat(xlog).join("\n");
}
/* Did this recording capture anything worth keeping? A single frame in a valid
MP4 wrapper is roughly 2 KB, and its media span is one frame long. */
function isDud(r){
if(!r || !r.blob) return true;
if(r.blob.size < 8192) return true;
// 40% of what was asked for, with a floor so genuinely tiny clips aren't
// rejected. Math.min here instead of Math.max let a clip that died after one
// second of six sail through.
if(r.span != null && r.want > 0.5 && r.span < Math.max(0.35, r.want*0.4)) return true;
return false;
}
async function recordRange(a, z, t, mime, ctx, cv, onProg, forceFree){
// Fixed frame rate stretches (or shortens) the range so it holds a whole
// number of frames, taking the extra from real video after the out point.
const fixed = cfrOn();
const fit = fixed ? frameFit(a, z) : null;
if(fit) z = Math.min(dur, a + fit.len);
const len = Math.max(0.02, z-a);
// captureStream(0) plus requestFrame() was how fixed frame rate used to work.
// It is the correct API and it is also how clips ended up as a single frame in
// a 2 KB file: when a browser doesn't honour the manual requests there is no
// error, the track simply emits the one frame it started with and stops. The
// canvas now always samples on its own clock, which cannot fail that way.
// Fixed frame rate instead means "paint strictly on the 1/fps grid".
const paced = fixed && !forceFree;
const cStream = cv.captureStream(t.f);
const vtrk = cStream.getVideoTracks()[0];
// Tell the encoder to favour a sharp picture over smoothing. Measured free:
// +1.0 dB PSNR and it holds the target frame rate better, at the same file size.
try{ if(vtrk) vtrk.contentHint = "detail"; }catch(e){}
const wantFrames = paced && fit ? fit.frames : 0;
let emitted = 0;
const tracks = [...cStream.getVideoTracks()];
if(streamDest && wantAudio()) tracks.push(...streamDest.stream.getAudioTracks());
const stream = new MediaStream(tracks);
let rec;
try{ rec = new MediaRecorder(stream, {mimeType:mime, videoBitsPerSecond:t.bitrate, audioBitsPerSecond:192000}); }
catch(e){ rec = new MediaRecorder(stream, {mimeType:mime}); }
const chunks=[];
let recBytes=0, recErr="";
rec.ondataavailable = e => { if(e.data && e.data.size){ chunks.push(e.data); recBytes+=e.data.size; } };
rec.onerror = e => {
const err = (e && e.error) || e;
recErr = (err && (err.name || err.message)) ? ((err.name||"")+" "+(err.message||"")).trim() : "unknown";
log("rec.onerror: "+recErr);
};
const stopped = new Promise(r => rec.onstop = ()=>{ log("rec.onstop fired (bytes="+recBytes+")"); r(); });
const paintFrame = ()=> drawSource(ctx, t.w, t.h);
await seekTo(a);
// Container duration is not always honest — plenty of files (AI-generated
// clips especially) claim more than they hold. Seeking past the real end
// silently lands short, playback fires "ended" straight away, and the recorder
// gets one frame before stopping. That produced a ~2 KB file that the app
// cheerfully saved. Catch it here instead.
log("recordRange a="+a.toFixed(3)+" z="+z.toFixed(3)+" len="+len.toFixed(3)
+" paced="+paced+" wantFrames="+wantFrames+" out="+t.w+"x"+t.h+"@"+t.f
+" mime="+mime+" audioTrack="+(streamDest&&wantAudio()?"yes":"no"));
const landed = V.currentTime;
if(V.ended || landed < a - 0.3){
try{ cStream.getTracks().forEach(x=>x.stop()); }catch(e){}
return { blob:new Blob([]), ext:(mime.indexOf("mp4")>=0?"mp4":"webm"), stalled:false, speed:1,
aborted:false, blank:false, frames:0, fps:0, span:0,
reason:"the video actually ends at "+tc(landed,false)+", before this clip starts ("
+tc(a,false)+"), even though it reports a length of "+tc(dur,false) };
}
drawSource(ctx, t.w, t.h);
// Sampled a few times while recording. If every look is pure black but the
// video itself isn't, something is drawing nothing and the clip is a write-off
// — better to say so than to hand over a black file.
let blankLooks=0, blankSeen=0, lastLook=0, dead=false;
let stopClock=null, stopping=false, stalled=false, aborted=false, why="";
let wall0=0, media0=a, stopAt=z, speed=1, pausedTotal=0, pausedAt=0, hiddenPaused=false;
let lastT=V.currentTime, stallMs=0, prevNow=performance.now();
const paintFloor = Math.max(16, 1000/Math.max(1,t.f));
let lastPaint = 0, vfcOn = false;
const maxMs = len*1000*3 + 8000; // a clip can never run away, whatever else breaks
const stop = (immediate)=>{
const el=(performance.now()-wall0-pausedTotal)/1000;
if(el>0.2) speed=(V.currentTime-media0)/el;
V.pause();
const finish = ()=>{
if(stopClock){ stopClock(); stopClock=null; }
try{ rec.stop(); }catch(e){}
};
// Hold on the last frame briefly before cutting the recorder. Without it the
// final frame gets no screen time and a 10.000 s clip lands at 9.999 s —
// which most players display as 0:09.
if(immediate) finish();
else setTimeout(finish, Math.max(110, 2000/Math.max(1,t.f)));
};
// Chrome may stop decoding video for a hidden tab, so recording while hidden
// can't be trusted. Pause instead and pick up where we left off.
const onVis = ()=>{
if(stopping) return;
if(document.hidden && !hiddenPaused){
hiddenPaused=true; pausedAt=performance.now();
try{ V.pause(); }catch(e){}
try{ if(rec.state==="recording") rec.pause(); }catch(e){}
setStatus("Paused — come back to this tab to carry on exporting");
}else if(!document.hidden && hiddenPaused){
hiddenPaused=false; pausedTotal += performance.now()-pausedAt;
prevNow=performance.now(); lastPaint=0;
try{ if(rec.state==="paused") rec.resume(); }catch(e){}
V.play().catch(()=>{});
keepAwake(true);
}
};
document.addEventListener("visibilitychange", onVis);
const tick = ()=>{
if(stopping || hiddenPaused) return;
const now=performance.now();
if(paced){
// Repaint only when the next slot on the frame grid is due, so the canvas
// holds each frame for its full share of time instead of being redrawn
// whenever the browser happens to ask.
const due = Math.min(wantFrames, Math.floor((now-wall0-pausedTotal)/1000 * t.f) + 1);
if(emitted < due){ paintFrame(); emitted = due; lastPaint = now; }
}else if(!vfcOn || now-lastPaint > paintFloor){ paintFrame(); lastPaint = now; }
// Manual capture asks the canvas for each frame by hand. When a browser
// ignores those requests the track only ever emits the one frame it started
// with, and the export ends up a ~2 KB file holding a single picture. There
// is no error for this, so watch the encoder's output instead: frames going
// out but almost no bytes coming back means the path isn't working.
// Frames going by with almost nothing coming back from the encoder means
// the recording is not happening, whatever the reason.
if(!dead && now-wall0 > 1800 && recBytes < 4096){
dead=true; stopping=true; why="the encoder returned no data";
stop(true); return;
}
if(blankLooks<3 && now-wall0>350 && now-lastLook>700){
lastLook=now; blankLooks++;
if(canvasIsBlank(cv) && !frameIsBlank()) blankSeen++;
}
if(Math.abs(V.currentTime-lastT)>0.001){ lastT=V.currentTime; stallMs=0; } else { stallMs += now-prevNow; }
prevNow=now;
if(onProg) onProg(clamp((V.currentTime-a)/len,0,1), Math.max(0,len-(V.currentTime-a)));
if(cancelExport || (paced && emitted >= wantFrames && V.currentTime >= stopAt) || V.currentTime >= stopAt || V.ended ||
stallMs > 10000 || (now-wall0-pausedTotal) > maxMs){
stopping=true;
log("stopping at t="+V.currentTime.toFixed(3)+" emitted="+emitted+" bytes="+recBytes
+" stallMs="+Math.round(stallMs));
if(cancelExport) aborted=true; // half a clip is worse than none
if(stallMs>10000 || (now-wall0-pausedTotal)>maxMs) stalled=true;
why = cancelExport ? "stopped by you"
: V.ended ? "the video ended"
: V.currentTime>=stopAt ? "reached the out point"
: stallMs>10000 ? "playback stalled" : "took too long";
stop(cancelExport || V.ended);
}
};
const onEnded = ()=>{ if(!stopping){ stopping=true; why="the video ended";
log("'ended' fired at t="+V.currentTime.toFixed(3)); stop(true); } };
V.addEventListener("ended", onEnded);
// start playback FIRST, then the recorder — otherwise the frozen first frame
// gets baked into the front of the clip and the output runs long
V.playbackRate = 1;
try{ await V.play(); }
catch(e){
document.removeEventListener("visibilitychange", onVis);
V.removeEventListener("ended",onEnded);
try{ cStream.getTracks().forEach(x=>x.stop()); }catch(e2){}
throw new Error("Couldn't start playback: "+e.message);
}
// Measure the end point from where the recorder actually began, not from the
// mark. play() resolves a few ms after the video starts moving, and that gap
// used to come straight off the length of the clip.
wall0 = performance.now(); media0 = V.currentTime;
stopAt = Math.min(dur, media0 + len);
log("playing: media0="+media0.toFixed(3)+" stopAt="+stopAt.toFixed(3)+" paused="+V.paused+" ended="+V.ended);
prevNow = wall0; lastPaint = 0;
if(!paced && "requestVideoFrameCallback" in HTMLVideoElement.prototype){
vfcOn = true;
const vfc = ()=>{ if(stopping) return; paintFrame(); lastPaint=performance.now();
try{ V.requestVideoFrameCallback(vfc); }catch(e){} };
try{ V.requestVideoFrameCallback(vfc); }catch(e){ vfcOn=false; }
}
rec.start(200);
log("rec.start: state="+rec.state+" mime="+rec.mimeType+" streamActive="+stream.active
+" tracks="+stream.getTracks().map(x=>x.kind+":"+x.readyState+(x.muted?"/muted":"")).join(","));
stopClock = makeClock(tick);
try{
// A recorder that errors, or a stop that never lands, used to leave this
// waiting forever with the clock still ticking and the video still playing.
await Promise.race([stopped, new Promise(r=>setTimeout(r, maxMs+15000))]);
}finally{
// Whatever happened above, nothing is left running.
if(stopClock){ stopClock(); stopClock=null; }
document.removeEventListener("visibilitychange", onVis);
V.removeEventListener("ended", onEnded);
try{ if(rec.state!=="inactive") rec.stop(); }catch(e){}
try{ V.pause(); }catch(e){}
try{ cStream.getTracks().forEach(x=>x.stop()); }catch(e){}
}
const type = mime.split(";")[0];
log("finished: span="+(V.currentTime-media0).toFixed(3)+"s of "+len.toFixed(3)
+"s, bytes="+recBytes+", reason="+(why||"?"));
return { blob:new Blob(chunks,{type}), ext:(type.indexOf("mp4")>=0?"mp4":"webm"), stalled, speed, aborted,
blank: blankLooks>0 && blankSeen===blankLooks,
span: Math.max(0, V.currentTime - media0), want: len,
reason: why || (recErr ? "the encoder failed ("+recErr+")" : "the recorder stopped on its own"),
recErr, mime, dead,
usedManual: paced, bytes: recBytes,
frames: paced ? emitted : 0, fps: paced ? t.f : 0 };
}
/* ---------------- GIF encoder ----------------
Written out longhand so the file stays self-contained and works offline.
GIF is limited to 256 colours per frame, so each frame gets its own palette
(median cut) and Floyd-Steinberg dithering to stop gradients banding. */
const _hist=new Int32Array(32768), _rs=new Int32Array(32768), _gs=new Int32Array(32768), _bs=new Int32Array(32768);
const _bins=new Int32Array(32768), _cache=new Int16Array(32768);
function gifBytes(){
let b=new Uint8Array(1<<18), n=0;
const grow=k=>{ if(n+k<=b.length) return; let L=b.length; while(L<n+k) L*=2;
const t=new Uint8Array(L); t.set(b.subarray(0,n)); b=t; };
return {
u8(v){ grow(1); b[n++]=v&255; },
u16(v){ grow(2); b[n++]=v&255; b[n++]=(v>>8)&255; },
str(s){ grow(s.length); for(let i=0;i<s.length;i++) b[n++]=s.charCodeAt(i); },
raw(a){ grow(a.length); b.set(a,n); n+=a.length; },
size(){ return n; },
out(){ return b.slice(0,n); }
};
}
function buildPalette(data, maxColors){
_hist.fill(0); _rs.fill(0); _gs.fill(0); _bs.fill(0);
for(let i=0;i<data.length;i+=4){
const r=data[i], g=data[i+1], b=data[i+2];
const k=((r>>3)<<10)|((g>>3)<<5)|(b>>3);
_hist[k]++; _rs[k]+=r; _gs[k]+=g; _bs[k]+=b;
}
let m=0; for(let k=0;k<32768;k++) if(_hist[k]) _bins[m++]=k;
const stat=(s,e)=>{
let rmin=31,rmax=0,gmin=31,gmax=0,bmin=31,bmax=0;
for(let i=s;i<e;i++){ const k=_bins[i], r=(k>>10)&31, g=(k>>5)&31, b=k&31;
if(r<rmin)rmin=r; if(r>rmax)rmax=r;
if(g<gmin)gmin=g; if(g>gmax)gmax=g;
if(b<bmin)bmin=b; if(b>bmax)bmax=b; }
const dr=rmax-rmin, dg=gmax-gmin, db=bmax-bmin;
let chan=0, ext=dr;
if(dg>ext){ chan=1; ext=dg; }
if(db>ext){ chan=2; ext=db; }
return {s,e,chan,ext};
};
let boxes=[stat(0,m)];
while(boxes.length<maxColors){
let bi=-1, best=0;
for(let i=0;i<boxes.length;i++){ const B=boxes[i];
if(B.e-B.s<2) continue;
if(B.ext>best){ best=B.ext; bi=i; } }
if(bi<0) break;
const B=boxes[bi], shift=B.chan===0?10:B.chan===1?5:0;
const sub=Array.from(_bins.subarray(B.s,B.e));
sub.sort((x,y)=>(((x>>shift)&31)-((y>>shift)&31)));
_bins.set(sub,B.s);
let total=0; for(let i=B.s;i<B.e;i++) total+=_hist[_bins[i]];
let acc=0, mid=B.s+1;
for(let i=B.s;i<B.e;i++){ acc+=_hist[_bins[i]]; if(acc*2>=total){ mid=i+1; break; } }
if(mid<=B.s) mid=B.s+1;
if(mid>=B.e) mid=B.e-1;
boxes.splice(bi,1,stat(B.s,mid),stat(mid,B.e));
}
const pal=new Uint8Array(768);
for(let i=0;i<boxes.length;i++){
const B=boxes[i]; let c=0,R=0,G=0,Bl=0;
for(let x=B.s;x<B.e;x++){ const k=_bins[x]; c+=_hist[k]; R+=_rs[k]; G+=_gs[k]; Bl+=_bs[k]; }
if(c){ pal[i*3]=Math.round(R/c); pal[i*3+1]=Math.round(G/c); pal[i*3+2]=Math.round(Bl/c); }
}
return {pal, count:Math.max(1,boxes.length)};
}
function mapToPalette(data, w, h, pal, palCount, dither){
const idx=new Uint8Array(w*h);
_cache.fill(-1);
const nearest=(r,g,b)=>{
const key=((r>>3)<<10)|((g>>3)<<5)|(b>>3);
const hit=_cache[key]; if(hit>=0) return hit;
let bd=Infinity, bi=0;
for(let i=0;i<palCount;i++){
const dr=r-pal[i*3], dg=g-pal[i*3+1], db=b-pal[i*3+2];
const d=dr*dr*3+dg*dg*6+db*db; // roughly luma-weighted
if(d<bd){ bd=d; bi=i; }
}
_cache[key]=bi; return bi;
};
if(!dither){
for(let p=0,q=0;q<idx.length;q++,p+=4) idx[q]=nearest(data[p],data[p+1],data[p+2]);
return idx;
}
const buf=new Float32Array(w*h*3);
for(let p=0,q=0;q<w*h;q++,p+=4){ buf[q*3]=data[p]; buf[q*3+1]=data[p+1]; buf[q*3+2]=data[p+2]; }
const cl=v=>v<0?0:(v>255?255:v);
for(let y=0;y<h;y++){
for(let x=0;x<w;x++){
const q=y*w+x, o=q*3;
const r=cl(buf[o]), g=cl(buf[o+1]), b=cl(buf[o+2]);
const i=nearest(r|0,g|0,b|0); idx[q]=i;
const er=(r-pal[i*3])*0.75, eg=(g-pal[i*3+1])*0.75, eb=(b-pal[i*3+2])*0.75;
if(x+1<w){ const oo=(q+1)*3; buf[oo]+=er*0.4375; buf[oo+1]+=eg*0.4375; buf[oo+2]+=eb*0.4375; }
if(y+1<h){
if(x>0){ const oo=(q+w-1)*3; buf[oo]+=er*0.1875; buf[oo+1]+=eg*0.1875; buf[oo+2]+=eb*0.1875; }
{ const oo=(q+w)*3; buf[oo]+=er*0.3125; buf[oo+1]+=eg*0.3125; buf[oo+2]+=eb*0.3125; }
if(x+1<w){ const oo=(q+w+1)*3; buf[oo]+=er*0.0625; buf[oo+1]+=eg*0.0625; buf[oo+2]+=eb*0.0625; }
}
}
}
return idx;
}
function lzwWrite(minCodeSize, indices, g){
const CLEAR=1<<minCodeSize, EOI=CLEAR+1;
let codeSize=minCodeSize+1, next=EOI+1;
let dict=new Map(), cur=0, curBits=0;
const block=[];
const flush=()=>{ if(block.length){ g.u8(block.length); for(let i=0;i<block.length;i++) g.u8(block[i]); block.length=0; } };
const emit=code=>{
cur |= code<<curBits; curBits += codeSize;
while(curBits>=8){ block.push(cur&255); cur>>>=8; curBits-=8; if(block.length===255) flush(); }
};
g.u8(minCodeSize);
emit(CLEAR);
let prefix=indices[0];
for(let i=1;i<indices.length;i++){
const k=indices[i], key=prefix*256+k, found=dict.get(key);
if(found!==undefined){ prefix=found; continue; }
emit(prefix);
if(next===4096){
emit(CLEAR); dict=new Map(); next=EOI+1; codeSize=minCodeSize+1;
}else{
// grow the code width BEFORE claiming the code, so the decoder — which
// builds its table one code behind — switches width at the same place
if(next >= (1<<codeSize) && codeSize<12) codeSize++;
dict.set(key,next); next++;
}
prefix=k;
}
emit(prefix); emit(EOI);
if(curBits>0){ block.push(cur&255); if(block.length===255) flush(); }
flush();
g.u8(0);
}
function bgOn(){ const c=$("bgWork"); return !c || c.checked; }
function whileVisible(){
if(!document.hidden || bgOn()) return Promise.resolve();
setStatus("Paused — come back to this tab to carry on");
return new Promise(res=>{
const h=()=>{ if(!document.hidden){ document.removeEventListener("visibilitychange",h); res(); } };
document.addEventListener("visibilitychange",h);
});
}
/* A yield that survives a hidden tab. setTimeout is clamped to about one second
in background tabs (and once a minute after a few minutes), which would drag a
64-frame sheet out to over a minute of doing nothing. MessageChannel posts are
not clamped that way, so the loop keeps its normal pace out of sight. */
const _yieldChan = (typeof MessageChannel === "function") ? new MessageChannel() : null;
let _yieldQueue = [];
if(_yieldChan) _yieldChan.port1.onmessage = ()=>{ const f=_yieldQueue.shift(); if(f) f(); };
function yieldTick(){
if(!_yieldChan) return new Promise(r=>setTimeout(r,0));
return new Promise(r=>{ _yieldQueue.push(r); _yieldChan.port2.postMessage(0); });
}
/* Browsers are much less keen to freeze a tab that is making sound, so a silent
tone runs for the length of a background-friendly export. It uses its own
context rather than the one wired to the video, which is busy during exports. */
let bgCtx=null, bgNode=null;
function bgKeepAlive(on){
try{
if(on){
if(bgCtx) return;
// Browsers cap how many AudioContexts a page may hold (Chrome allows six).
// Opening a fresh one per export used to creep towards that ceiling, and
// once it was hit the export's own audio setup threw instead.
if(audioCtx){ bgCtx = audioCtx; bgNode = null; return; }
bgCtx = new (window.AudioContext||window.webkitAudioContext)();
const g = bgCtx.createGain(); g.gain.value = 0.0001; // inaudible, but not "silence"
bgNode = bgCtx.createOscillator(); bgNode.frequency.value = 20;
bgNode.connect(g); g.connect(bgCtx.destination); bgNode.start();
if(bgCtx.state === "suspended") bgCtx.resume().catch(()=>{});
}else if(bgCtx){
if(bgNode){ try{ bgNode.stop(); }catch(e){} }
if(bgCtx !== audioCtx){ try{ bgCtx.close(); }catch(e){} } // never close the shared one
bgCtx=null; bgNode=null;
}
}catch(e){ bgCtx=null; bgNode=null; }
}
/* Renders by seeking frame by frame rather than playing in real time, so it is
exact and doesn't care how fast the machine is. */
async function renderGif(a, z, t, ctx, cv, onProg){
const len=Math.max(0.02, z-a);
const gf = clamp(Math.round(+$("gfps").value||10), 1, 20);
const delay = Math.max(2, Math.round(100/gf)); // GIF delays are in 1/100 s
const fit = fitWithin(t.w, t.h, imgCap());
const w=fit.w, h=fit.h;
const n=Math.max(1, Math.min(900, Math.round(len*100/delay)));
const g=gifBytes();
g.str("GIF89a"); g.u16(w); g.u16(h); g.u8(0x70); g.u8(0); g.u8(0);
g.u8(0x21); g.u8(0xFF); g.u8(11); g.str("NETSCAPE2.0"); g.u8(3); g.u8(1); g.u16(0); g.u8(0); // loop forever
let aborted=false, t0=performance.now();
for(let i=0;i<n;i++){
if(cancelExport){ aborted=true; break; }
await whileVisible();
await seekTo(Math.min(z-0.001, a + i*delay/100));
drawSource(ctx, w, h);
const img=ctx.getImageData(0,0,w,h);
const {pal,count}=buildPalette(img.data, 256);
const idx=mapToPalette(img.data, w, h, pal, count, true);
g.u8(0x21); g.u8(0xF9); g.u8(4); g.u8(0x04); g.u16(delay); g.u8(0); g.u8(0);
g.u8(0x2C); g.u16(0); g.u16(0); g.u16(w); g.u16(h); g.u8(0x87);
g.raw(pal);
lzwWrite(8, idx, g);
if(onProg){
const per=(performance.now()-t0)/(i+1)/1000;
onProg((i+1)/n, Math.max(0,(n-i-1)*per));
}
if((i&1)===0) await yieldTick(); // keep the page responsive
}
g.u8(0x3B);
return { blob:new Blob([g.out()],{type:"image/gif"}), ext:"gif", stalled:false, speed:1, aborted,
frames:n, fps:Math.round(1000/delay)/10 };
}
/* ---------------- snapshot ----------------
Grabs whatever frame is currently on screen — same crop and output size as
the video/GIF export — and saves it as a PNG. No recording involved, so
it's instant. */
async function takeSnapshot(){
if(exporting || !dur) return;
const t = targets();
const fit = fitWithin(t.w, t.h, imgCap());
const cv = $("exportCanvas"); cv.width=fit.w; cv.height=fit.h;
const ctx = cv.getContext("2d", {alpha:false});
ctx.imageSmoothingEnabled=true; ctx.imageSmoothingQuality="high";
if(frameIsBlank()) await settleFrame(120);
drawSource(ctx, fit.w, fit.h);
cv.toBlob(blob=>{
if(!blob || !blob.size){ setStatus("Couldn't capture that frame."); return; }
const base = safeName(srcName,60) || "clip";
const name = base+"_"+stamp(V.currentTime)+"_"+fit.w+"x"+fit.h+".png";
pushDownload(blob, name);
setStatus("Saved "+name);
}, "image/png");
}
/* ---------------- extract audio ----------------
Decodes the file's own audio track and writes the selected span out as a WAV.
WAV rather than MP3 because a browser can't make an MP3 without shipping an
encoder alongside it, and this file stays self-contained and offline. */
function wavBytes(buf){
const ch = buf.numberOfChannels, n = buf.length, sr = buf.sampleRate;
const data = new ArrayBuffer(44 + n*ch*2), view = new DataView(data);
const str = (off,t)=>{ for(let i=0;i<t.length;i++) view.setUint8(off+i, t.charCodeAt(i)); };
str(0,"RIFF"); view.setUint32(4, 36 + n*ch*2, true); str(8,"WAVEfmt ");
view.setUint32(16, 16, true); view.setUint16(20, 1, true); // PCM
view.setUint16(22, ch, true); view.setUint32(24, sr, true);
view.setUint32(28, sr*ch*2, true); view.setUint16(32, ch*2, true);
view.setUint16(34, 16, true); str(36,"data"); view.setUint32(40, n*ch*2, true);
const src = [];
for(let c=0;c<ch;c++) src.push(buf.getChannelData(c));
let off = 44;
for(let i=0;i<n;i++){
for(let c=0;c<ch;c++){
let v = src[c][i];
v = v<-1 ? -1 : v>1 ? 1 : v;
view.setInt16(off, v<0 ? v*0x8000 : v*0x7FFF, true);
off += 2;
}
}
return new Blob([data], {type:"audio/wav"});
}
async function extractAudio(){
if(exporting || !dur) return;
if(!srcFile){ setStatus("Load the video again first — the original file isn't to hand."); return; }
const btn = $("audioBtn");
btn.disabled = true; btn.textContent = "Reading audio…";
try{
const ctx = new (window.OfflineAudioContext||window.webkitOfflineAudioContext)(1, 1, 44100);
const raw = await srcFile.arrayBuffer();
const full = await ctx.decodeAudioData(raw);
if(!full || !full.length || !full.numberOfChannels) throw new Error("no audio track");
// Slice the selection out as plain views over the decoded samples — no copy,
// and the WAV writer only ever asks for one channel at a time.
const a = clamp(inT, 0, full.duration), z = clamp(outT, a, full.duration);
const s0 = Math.floor(a*full.sampleRate);
const n = Math.max(1, Math.min(full.length-s0, Math.floor((z-a)*full.sampleRate)));
const out = {
numberOfChannels: full.numberOfChannels,
length: n,
sampleRate: full.sampleRate,
getChannelData: c => full.getChannelData(c).subarray(s0, s0+n)
};
const blob = wavBytes(out);
const base = safeName(srcName,60) || "clip";
const name = base+"_"+stamp(a)+"-"+stamp(z)+".wav";
pushDownload(blob, name);
setStatus("Saved "+name+" · "+bytes(blob.size));
}catch(e){
setStatus("Couldn't pull the audio out — this browser may not be able to decode this file's audio track. Exporting a clip with audio still works.");
}finally{
btn.disabled = false; btn.textContent = "Extract audio only";
}
}
$("audioBtn").addEventListener("click", extractAudio);
/* ---------------- storyboard ----------------
Nine frames spread evenly from the start of the selection to its end, laid out
left to right then down, with a 2px gap between them. Built by seeking rather
than playing, so it takes a couple of seconds whatever the clip length. */
const SB_GAP = 2;
/* One ceiling for every picture export: nothing comes out with a side longer
than this, however big the video or the storyboard grid is. */
function imgCap(){ return clamp(Math.round(+$("imgMax").value||1920), 64, 8000); }
function fitWithin(w, h, m){
const s = Math.min(1, m/Math.max(w,h));
return {w: Math.max(1,Math.round(w*s)), h: Math.max(1,Math.round(h*s)), scale:s};
}
function sbGrid(){
const c = clamp(Math.round(+$("sbCols").value||3), 1, 10);
const r = clamp(Math.round(+$("sbRows").value||3), 1, 10);
return {c, r};
}
function sbCell(t, cols, rows){
// Size the cells from the space left AFTER the gaps, so the finished sheet
// lands inside the ceiling rather than a few pixels over it.
const m = imgCap(), ar = Math.max(0.01, t.w/t.h);
let cw = Math.min(t.w, 800);
cw = Math.min(cw, Math.floor((m - (cols-1)*SB_GAP) / cols));
cw = Math.min(cw, Math.floor((m - (rows-1)*SB_GAP) / rows * ar));
cw = Math.max(8, cw);
let ch = Math.max(8, Math.round(cw/ar));
for(let i=0;i<4 && rows*ch + (rows-1)*SB_GAP > m && ch > 8;i++){
ch = Math.max(8, ch - Math.ceil((rows*ch + (rows-1)*SB_GAP - m)/rows));
cw = Math.max(8, Math.round(ch*ar));
}
return {cw, ch};
}
/* A small numbered badge in the top-left of a cell. Drawn in cell-local
coordinates, so it goes on after the frame while the canvas is still
translated to that cell. Sized off the cell so it stays readable on any grid. */
function drawIndexBadge(g, n, cw, ch){
const fs = Math.max(9, Math.round(Math.min(cw, ch) * 0.11));
const pad = Math.max(3, Math.round(fs * 0.38));
const m = Math.max(3, Math.round(fs * 0.34));
const txt = String(n);
g.save();
g.font = "700 " + fs + "px system-ui, -apple-system, Segoe UI, sans-serif";
g.textBaseline = "top";
g.textAlign = "left";
const bw = Math.round(g.measureText(txt).width) + pad*2, bh = fs + pad*2;
g.fillStyle = "rgba(0,0,0,0.62)";
if(g.roundRect){ g.beginPath(); g.roundRect(m, m, bw, bh, Math.round(fs*0.32)); g.fill(); }
else g.fillRect(m, m, bw, bh);
g.fillStyle = "#ffffff";
g.fillText(txt, m + pad, m + pad);
g.restore();
}
/* Both storyboards paint the same kind of sheet — the only difference is where
the frame times come from. */
async function composeSheet(times, COLS, ROWS, t, cv, onProg, number){
const {cw, ch} = sbCell(t, COLS, ROWS);
const W = COLS*cw + (COLS-1)*SB_GAP, H = ROWS*ch + (ROWS-1)*SB_GAP;
cv.width = W; cv.height = H;
const g = cv.getContext("2d", {alpha:false});
g.imageSmoothingEnabled = true; g.imageSmoothingQuality = "high";
g.fillStyle = "#ffffff"; g.fillRect(0,0,W,H); // shows through as the 2px gaps
const cells = Math.min(times.length, COLS*ROWS);
for(let i=0;i<cells;i++){
if(cancelExport) return {aborted:true};
await whileVisible();
await seekTo(times[i]);
const col = i % COLS, row = (i / COLS) | 0; // across first, then down
g.save();
g.translate(col*(cw+SB_GAP), row*(ch+SB_GAP));
drawSource(g, cw, ch);
if(number) drawIndexBadge(g, i+1, cw, ch);
g.restore();
if(onProg) onProg((i+1)/cells, Math.max(0,(cells-i-1)*0.35));
await yieldTick();
}
return { blob: await new Promise(res=>cv.toBlob(res, "image/png")) };
}
/* evenly spaced from the start of the selection to its end */
async function renderStory(a, z, t, ctx, cv, onProg){
const {c:C, r:R} = sbGrid(), count = C*R, span = Math.max(0, z-a);
const times = [];
for(let i=0;i<count;i++) times.push(count>1 ? a + span*i/(count-1) : a);
times[count-1] = Math.min(times[count-1], z-0.001);
const out = await composeSheet(times, C, R, t, cv, onProg, $("sbNum").checked);
return { blob: out.blob || new Blob([]), ext:"png", stalled:false, speed:1, aborted:!!out.aborted };
}
/* exactly the frames you picked, in the order you picked them */
async function renderManual(a, z, t, ctx, cv, onProg){
const {c:C, r:R} = msGrid();
const out = await composeSheet(snaps.map(x=>x.t), C, R, t, cv, onProg, $("msNum").checked);
return { blob: out.blob || new Blob([]), ext:"png", stalled:false, speed:1, aborted:!!out.aborted };
}
/* One setting, two places to tick it — keep them agreeing with each other. */
$("sbNum").addEventListener("change", ()=>{ $("msNum").checked = $("sbNum").checked; });
$("msNum").addEventListener("change", ()=>{ $("sbNum").checked = $("msNum").checked; });
/* ---------------- export ---------------- */
$("exportBtn").addEventListener("click", ()=>doExport("video"));
$("snapBtn").addEventListener("click", takeSnapshot);
$("gifBtn").addEventListener("click", ()=>doExport("gif"));
$("sbBtn").addEventListener("click", ()=>doExport("story"));
$("msBtn").addEventListener("click", ()=>doExport("manual"));
$("stopBtn").addEventListener("click", ()=>{ cancelExport=true; setStatus("Stopping…"); });
async function doExport(mode){
if(exporting || !dur) return;
const isGif = mode === "gif";
const isStory = mode === "story";
const isManual = mode === "manual";
if(isManual && !snaps.length){
setStatus("Add some snapshots first — park the playhead and press + Add snapshot.");
return;
}
sheetKind = isManual ? "manual" : "auto";
const t = targets();
const list = isManual ? [{start:inT, end:outT, name:""}]
: exportList().filter(s => s.end - s.start >= 0.05);
if(!list.length){ setStatus("Selection is too short."); return; }
const multi = list.length > 1;
let mime = isGif ? "image/gif" : (isStory||isManual) ? "image/png" : pickMime();
if(!mime){ setStatus("This browser can't record video. Try Chrome or Edge."); return; }
if(isStory||isManual) lastExt = "png";
if(isGif){ // GIFs balloon quickly — say so before spending the time
const gfps = Math.min(20, t.f);
const frames = Math.round(list.reduce((x,sg)=>x+(sg.end-sg.start),0) * gfps);
if(t.w*t.h*frames > 90e6 &&
!confirm("That's "+frames+" frames at "+t.w+"×"+t.h+", which will make a very large GIF and take a while.\n\nA smaller width or fewer frames per second would help.\n\nCarry on anyway?")) return;
}
// several files → put them in a folder of your choosing (must happen on the click)
let dirHandle = null;
if(multi && window.showDirectoryPicker){
try{
dirHandle = await window.showDirectoryPicker({id:"nugget-clips", mode:"readwrite", startIn:"videos"});
}catch(e){
if(e && e.name === "AbortError"){ setStatus("Export cancelled — no folder chosen."); return; }
dirHandle = null; // not supported here; fall back to downloads
}
}
logStart();
log("export mode="+mode+" clips="+list.length+" cfr="+$("cfr").checked+" h3="+$("h3").checked
+" crop="+(crop? JSON.stringify(cropRect()) : "none"));
exporting=true; cancelExport=false;
clearResult(); clearSaved();
$("failBox").style.display="none";
$("exportBtn").disabled=true; $("gifBtn").disabled=true; $("snapBtn").disabled=true;
$("sbBtn").disabled=true; $("msBtn").disabled=true; $("audioBtn").disabled=true;
$("exportBtn").textContent = isGif ? "Building GIF…" : (isStory||isManual) ? "Building storyboard…" : "Exporting…";
$("stopBtn").style.display="block";
$("expNote").style.display="block";
$("bar").style.display="block"; $("barI").style.width="0%";
V.pause();
const cv=$("exportCanvas"); cv.width=t.w; cv.height=t.h;
const ctx=cv.getContext("2d",{alpha:false});
ctx.imageSmoothingEnabled=true; ctx.imageSmoothingQuality="high";
ctx.fillStyle="#000"; ctx.fillRect(0,0,t.w,t.h);
V.style.display="none"; cv.style.display="block"; $("cropLayer").style.display="none";
setupAudio();
log("audio: ctx="+(audioCtx?"ok":"none")+" dest="+(streamDest?"ok":"none")+(audioWhy?" err="+audioWhy:""));
if(audioCtx && audioCtx.state==="suspended"){ try{ await audioCtx.resume(); }catch(e){} }
if(monitorGain) monitorGain.gain.value = 0;
keepAwake(true);
// storyboards and GIFs are seek-driven, so they can carry on out of sight
if((isGif||isStory||isManual) && bgOn()) bgKeepAlive(true);
const total = list.reduce((a,s)=>a+(s.end-s.start),0);
let doneLen = 0, saved = [], slow = false, cut = false, failed = 0, frameCounts = [], blankOut = 0, duds = [], fellBack = false, switchedMime = "";
try{
for(let i=0;i<list.length;i++){
if(cancelExport) break;
const s = list[i];
const len = s.end - s.start;
const label = multi ? "Clip "+(i+1)+" of "+list.length+" · " : "";
const onProg = (p, left)=>{
const overall = (doneLen + p*len)/total;
$("barI").style.width=(overall*100).toFixed(1)+"%";
setStatus(label+(isGif?"building GIF ":(isStory||isManual)?"grabbing frames ":"recording ")+Math.round(p*100)+"% · about "+Math.ceil(left)+"s left");
};
let r = isGif ? await renderGif(s.start, s.end, t, ctx, cv, onProg)
: isManual ? await renderManual(s.start, s.end, t, ctx, cv, onProg)
: isStory ? await renderStory(s.start, s.end, t, ctx, cv, onProg)
: await recordRange(s.start, s.end, t, mime, ctx, cv, onProg);
// A recorder that stops almost immediately leaves a valid-looking file
// holding a single frame — about 2 KB. That used to be saved as a success.
// One retry clears the intermittent version of it; anything still short is
// reported rather than handed over.
// A container the browser claims to support can still refuse to record.
// Work down the list rather than repeating the one that just failed.
if(!isGif && !isStory && !isManual && !cancelExport){
const others = fallbackMimes(mime);
let tries = 0;
while(!r.aborted && (r.dead || isDud(r)) && tries < 3){
const nextMime = (r.usedManual && tries===0) ? mime : others.shift();
if(!nextMime) break;
const dropPacing = r.usedManual;
setStatus(label + (dropPacing
? "that didn't record — retrying without fixed frame rate…"
: "that didn't record — trying "+shortMime(nextMime)+"…"));
log("retry "+(tries+1)+": mime="+nextMime+" pacing="+(dropPacing?"off":"as set"));
r = await recordRange(s.start, s.end, t, nextMime, ctx, cv, onProg, dropPacing);
if(!isDud(r)){
if(dropPacing) fellBack = true;
if(nextMime !== mime){ switchedMime = shortMime(nextMime); mime = nextMime; }
}
tries++;
}
}
doneLen += len;
if(r.blank) blankOut++;
if(r.frames) frameCounts.push(r.frames);
if(r.ext) lastExt = r.ext; // may now differ from the first choice
if(r.stalled) cut = true;
if(!r.stalled && r.speed < 0.9) slow = true;
if(r.aborted) break; // stopped part-way through this clip — discard it
if(!r.blob.size || (!isGif && !isStory && !isManual && isDud(r))){
failed++;
duds.push((s.name || "clip "+(i+1))+" — "+(r.reason || "the recorder stopped straight away")
+ (r.span!=null && r.want ? " (captured "+r.span.toFixed(2)+"s of "+r.want.toFixed(2)+"s)" : ""));
continue; // don't save a file with nothing in it
}
const fname = clipFileName(i, s, t, multi);
if(dirHandle){
setStatus(label+"saving…");
try{
const fh = await dirHandle.getFileHandle(fname, {create:true});
const ws = await fh.createWritable();
await ws.write(r.blob); await ws.close();
saved.push(fname+" ("+bytes(r.blob.size)+")");
}catch(e){ failed++; saved.push(fname+" — could not be written: "+e.message); }
}else if(multi){
pushDownload(r.blob, fname);
saved.push(fname+" ("+bytes(r.blob.size)+")");
await new Promise(r2=>setTimeout(r2,400)); // let the browser keep up
}else{
lastBlob = r.blob;
lastMeta = {w:t.w, h:t.h, f:t.f, at:s.start, name:s.name};
const url = URL.createObjectURL(lastBlob);
if(isGif || isStory || isManual){ $("outImg").src=url; $("outImg").style.display="block"; $("outVid").style.display="none"; }
else { $("outVid").src=url; $("outVid").style.display="block"; $("outImg").style.display="none"; }
$("result").style.display="block";
log("saving "+fname+" size="+r.blob.size);
const n = download();
saved.push((n||fname)+" ("+bytes(r.blob.size)+")");
}
}
}catch(err){
setStatus(err.message);
}finally{
exporting=false;
if(monitorGain) monitorGain.gain.value=1;
cv.style.display="none"; V.style.display="block";
if(crop){ showCrop(true); layoutCrop(); }
$("exportBtn").disabled=false; $("gifBtn").disabled=false; $("snapBtn").disabled=false;
$("sbBtn").disabled=false; $("msBtn").disabled=false; $("audioBtn").disabled=false;
$("stopBtn").style.display="none";
$("expNote").style.display="none";
$("bar").style.display="none";
keepAwake(false);
bgKeepAlive(false);
try{ V.pause(); }catch(e){} // an export that failed part-way used to
V.currentTime=inT; // leave the video playing on by itself
estimate();
}
// ---- report ----
const notes=[];
if(lastExt==="webm" && !isGif && !isStory && !isManual) notes.push("Saved as .webm — this browser can't record MP4. Plays in Chrome, Edge, Firefox and VLC.");
if(cut) notes.push("Playback stalled on at least one clip, so it may be cut short.");
if(slow && !isGif && !isStory && !isManual) notes.push("Your computer couldn't play the video at full speed, so clips may run slightly slow. Try a smaller output size or lower quality.");
if(failed) notes.push(failed+" clip(s) could not be saved.");
duds.forEach(d=>notes.push("Nothing usable was recorded for "+d+"."));
if(switchedMime) notes.push("This browser accepted the first format and then refused to record it, so the clip "
+ "was saved as "+switchedMime+" instead. Nothing else changed.");
if(fellBack) notes.push("Fixed frame rate produced no video in this browser, so the clip was recorded "
+ "the normal way instead. The picture and length are right, but the frame timing isn't exact — "
+ "which also means the 17n+5 count isn't guaranteed.");
if(wantAudio() && !streamDest && !isGif && !isStory && !isManual)
notes.push("Audio was requested but couldn't be captured"+(audioWhy? " ("+audioWhy+")" : "")+", so the clip is silent.");
if(blankOut) notes.push(blankOut+" clip(s) came out completely black even though the video was playing. "
+ "That usually means the crop box didn't line up with the frame, or this browser's encoder rejected "
+ t.w+"\u00d7"+t.h+". Try turning the crop off, or an output size that's a multiple of 16.");
if(frameCounts.length && !fellBack){
const uniq = [...new Set(frameCounts)];
notes.push("Handed "+uniq.join(" / ")+" frame"+(frameCounts[0]===1?"":"s")+" to the encoder at "+t.f+" fps"
+ ($("h3").checked ? " (17n+5)" : "")
+ ". Check the finished file if the exact count matters — the browser does the encoding, not us.");
}
if(multi){
$("saved").style.display = saved.length ? "block" : "none";
$("savedWhere").textContent = cancelExport
? "Stopped — "+saved.length+" of "+list.length+" saved"
: "Saved "+saved.length+" clip"+(saved.length===1?"":"s")+(dirHandle? " to “"+dirHandle.name+"”" : " to your Downloads folder");
$("savedList").innerHTML="";
saved.forEach(n=>{ const li=document.createElement("li"); li.textContent=n; $("savedList").appendChild(li); });
if(!dirHandle && saved.length>1) notes.push("Chrome asks permission the first time a page saves several files — choose Allow if you see that prompt.");
$("savedNote").textContent = notes.join(" ");
setStatus(cancelExport ? "Stopped." : "Done — "+saved.length+" clip"+(saved.length===1?"":"s")+".");
}else{
$("outNote").textContent = notes.join(" ");
setStatus(cancelExport ? "Stopped." : (saved[0] ? "Saved "+saved[0] : "Nothing was saved."));
}
// The reasons and the log button used to live inside the results panel, which
// only appears when a file was produced — so a failed export said "Nothing was
// saved." and gave you no way to find out why. They have their own box now.
log("outcome: saved="+saved.length+" failed="+failed+" duds="+duds.length+" blank="+blankOut);
duds.forEach(d=>log("dud: "+d));
const bad = !cancelExport && !saved.length;
$("failBox").style.display = (bad || duds.length || blankOut) ? "block" : "none";
$("failNote").textContent = notes.length
? notes.join(" ")
: "The export produced nothing and didn't say why. The log below has the detail.";
}
function clipFileName(i, s, t, multi){
const base = safeName(srcName,60) || "clip";
if(lastExt==="png"){
const lblS = safeName(s.name,40);
const gg = sheetKind==="manual" ? msGrid() : sbGrid();
return base+"_storyboard_"+(sheetKind==="manual"?"manual_":"")+gg.c+"x"+gg.r+"_"+(multi? String(i+1).padStart(2,"0")+"_" : "")+(lblS || stamp(s.start))+".png";
}
if(lastExt==="gif"){
const lbl0 = safeName(s.name,40);
return base+"_"+(multi? String(i+1).padStart(2,"0")+"_" : "")+(lbl0 || stamp(s.start))+"_"+t.w+"px.gif";
}
if(!multi) return base+"_"+stamp(s.start)+"_"+t.w+"x"+t.h+"_"+t.f+"fps."+lastExt;
const lbl = safeName(s.name,40);
return base+"_"+String(i+1).padStart(2,"0")+"_"+(lbl || stamp(s.start))+"."+lastExt;
}
function pushDownload(blob, name){
try{
const a=document.createElement("a");
a.href=URL.createObjectURL(blob); a.download=name; a.style.display="none";
document.body.appendChild(a); a.click();
setTimeout(()=>{ URL.revokeObjectURL(a.href); a.remove(); }, 12000);
return name;
}catch(e){ return null; }
}
function download(){
if(!lastBlob || !lastBlob.size) return null;
const m = lastMeta || Object.assign(targets(), {at:inT, name:""});
const base = safeName(srcName,60) || "clip";
const lbl = safeName(m.name,40);
const name = lastExt==="png"
? base+"_storyboard_"+(sheetKind==="manual"?"manual_":"")
+(sheetKind==="manual"?msGrid().c:sbGrid().c)+"x"+(sheetKind==="manual"?msGrid().r:sbGrid().r)
+"_"+(lbl || stamp(m.at))+".png"
: lastExt==="gif"
? base+"_"+(lbl || stamp(m.at))+"_"+m.w+"px.gif"
: base+"_"+(lbl || stamp(m.at))+"_"+m.w+"x"+m.h+"_"+m.f+"fps."+lastExt;
return pushDownload(lastBlob, name);
}
$("dlBtn").addEventListener("click", ()=>{ download(); });
$("logBtn").addEventListener("click", async ()=>{
const txt = logText();
try{
await navigator.clipboard.writeText(txt);
setStatus("Export log copied — paste it wherever you need it.");
return;
}catch(e){}
// Clipboard access is refused on pages opened straight from disk in some
// browsers, so fall back to something you can select by hand.
try{
const ta=document.createElement("textarea");
ta.value=txt; ta.style.cssText="position:fixed;left:0;top:0;width:100%;height:60vh;z-index:99;font:12px monospace";
document.body.appendChild(ta); ta.focus(); ta.select();
const ok=document.execCommand&&document.execCommand("copy");
if(ok){ ta.remove(); setStatus("Export log copied — paste it wherever you need it."); return; }
setStatus("Select the text above and copy it, then click Copy export log again to dismiss.");
ta.addEventListener("blur", ()=>ta.remove(), {once:true});
}catch(e2){
console.log(txt);
setStatus("The log is in the browser console — press F12, open Console, and copy it from there.");
}
});
$("clearRes").addEventListener("click", clearResult);
function clearResult(){
lastBlob=null; lastMeta=null; $("result").style.display="none";
const ov=$("outVid"); if(ov.src){ URL.revokeObjectURL(ov.src); ov.removeAttribute("src"); }
const oi=$("outImg"); if(oi.src){ URL.revokeObjectURL(oi.src); oi.removeAttribute("src"); }
setStatus("");
}
function clearSaved(){ $("saved").style.display="none"; $("savedList").innerHTML=""; $("savedNote").textContent=""; }
function setStatus(s){ $("status").textContent=s; }
window.__vt = {
get state(){ return {ready:$("app").style.display==="block",loads:loadSeq,dur,inT,outT,natW,natH,srcFps,
exporting,size:lastBlob&&lastBlob.size,ext:lastExt,
clips:segments.map(s=>({start:+s.start.toFixed(3),end:+s.end.toFixed(3),name:s.name}))}; },
load, doExport, addClip,
gif(){ return doExport("gif"); },
story(){ return doExport("story"); },
manual(){ return doExport("manual"); },
addSnap, snaps(){ return snaps.map(x=>+x.t.toFixed(3)); },
picMode(v){ picMode=v; syncMode(); },
set(a,b){ inT=a; outT=b; refresh(); },
shift(d){ nudge(d); },
shiftTo(t){ shiftTo(t); },
activeSeg(){ return activeSeg; },
pickClip(i){ const sg=segments[i]; if(!sg) return; activeSeg=i; inT=sg.start; outT=sg.end; V.currentTime=sg.start; refresh(); },
setCrop(x,y,w,h){ setCrop(x,y,w,h); showCrop(true); cropChanged(true); },
getCrop(){ return crop && {...crop}; },
setAR(v,l){ applyAR(v, l||String(v)); },
arLabel(){ return cropARLabel; },
setName(i,n){ segments[i].name=n; refresh(); },
clearClips(){ segments=[]; activeSeg=-1; refresh(); }
};
})();
</script>
</body>
</html>
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