teleop viewer: multi-view sync — slow-loading tile skips to freshest buffered frame instead of replaying from start

teleopSample/drink_ep0.html

@@ -133,10 +133,20 @@ function syncSlaves(t,hard){
     if(hard){ v.playbackRate=1; if(!v.seeking&&Math.abs(v.currentTime-t)>0.06){ try{v.currentTime=t;}catch(e){} } continue; }
     if(!playing) continue;
     if(v.paused&&!v.ended){ v.play().catch(()=>{}); }
-    const drift=v.currentTime-t, ad=Math.abs(drift);
-    if(ad>0.75){ if(!v.seeking&&inBuf(v,t)){ try{v.currentTime=t;}catch(e){} } v.playbackRate=1; }
-    else if(ad>0.035){ v.playbackRate=Math.max(0.5,Math.min(1.6, 1-drift*3)); }
-    else v.playbackRate=1;
+    const drift=v.currentTime-t, ad=Math.abs(drift);   // drift<0 => this tile is behind
+    if(ad>1.0 && !v.seeking){
+      // big gap: jump to master if it's downloaded here, otherwise to the freshest
+      // buffered point of THIS tile — so a slow-loading tile skips ahead to current
+      // content instead of crawling from the start (which looked like a replay loop)
+      let tgt = inBuf(v,t) ? t
+        : (v.buffered.length ? Math.max(0, v.buffered.end(v.buffered.length-1)-0.25) : v.currentTime);
+      if(Math.abs(v.currentTime-tgt)>0.4){ try{ v.currentTime=tgt; }catch(e){} }
+      v.playbackRate=1;
+    } else if(ad>0.04){
+      v.playbackRate=Math.max(0.5,Math.min(1.8, 1-drift*3));   // trim toward master
+    } else {
+      v.playbackRate=1;
+    }
   }
 }
 function seekTo(t){ t=Math.max(0,Math.min(DUR-0.01,t));