File size: 3,352 Bytes
979665e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | """
Extract frames from the Motive Loop Closure Dataset raw video clips.
Usage:
# Extract all sequences at 2 fps (default)
python3 extract_frames.py
# Extract a specific sequence
python3 extract_frames.py --sequence v102_20260909_loop01
# Custom frame rate and output root
python3 extract_frames.py --fps 5 --frames-root ./frames_5fps
Outputs frames to:
data/<sequence_id>/<role>/frames/<fps>fps/000001.jpg ...
Requirements: ffmpeg must be on PATH
"""
from __future__ import annotations
import argparse, subprocess, sys
from pathlib import Path
SCRIPT_DIR = Path(__file__).parent
VIDEOS_DIR = SCRIPT_DIR / "videos"
DATA_DIR = SCRIPT_DIR / "data"
CLIP_DURATION = 180 # seconds
def extract(mp4: Path, out_dir: Path, fps: int):
out_dir.mkdir(parents=True, exist_ok=True)
existing = list(out_dir.glob("*.jpg"))
if existing:
print(f" {out_dir.name}/ already has {len(existing)} frames — skipping")
return len(existing)
cmd = [
"ffmpeg", "-y", "-i", str(mp4),
"-vf", f"fps={fps}",
"-q:v", "3",
str(out_dir / "%06d.jpg"),
]
result = subprocess.run(cmd, capture_output=True)
if result.returncode != 0:
print(f" ERROR: ffmpeg failed:\n{result.stderr.decode()[-300:]}")
return 0
n = len(list(out_dir.glob("*.jpg")))
print(f" → {n} frames")
return n
def main():
ap = argparse.ArgumentParser(description=__doc__,
formatter_class=argparse.RawDescriptionHelpFormatter)
ap.add_argument("--fps", type=int, default=2)
ap.add_argument("--sequence", default=None, help="Extract only this sequence")
ap.add_argument("--frames-root", default=None,
help="Root for frame output (default: data/<seq>/<role>/frames/<fps>fps/)")
args = ap.parse_args()
sequences = sorted(DATA_DIR.iterdir()) if DATA_DIR.exists() else []
if args.sequence:
sequences = [DATA_DIR / args.sequence]
total_frames = 0
for seq_dir in sequences:
if not seq_dir.is_dir():
continue
print(f"\n[{seq_dir.name}]")
for role in ("origin", "revisit"):
role_dir = seq_dir / role
if not role_dir.exists():
continue
# Find the mp4 in videos/
# filename pattern: v{vehicle}_{role}_{YYYYMMDD_HHMMSS}_front_facing.mp4
parts = seq_dir.name.split("_") # v102, 20260909, loop01
vehicle = parts[0][1:] # "102"
date = parts[1] # "20260909"
mp4s = sorted(VIDEOS_DIR.glob(f"v{vehicle}_{role}_*_front_facing.mp4"))
# Match by date
mp4s = [m for m in mp4s if date in m.name]
if not mp4s:
print(f" [{role}] no MP4 found in videos/ — download it first")
continue
mp4 = mp4s[0]
if args.frames_root:
out_dir = Path(args.frames_root) / seq_dir.name / role
else:
out_dir = role_dir / "frames" / f"{args.fps}fps"
print(f" [{role}] {mp4.name} @ {args.fps} fps")
total_frames += extract(mp4, out_dir, args.fps)
print(f"\nDone. {total_frames:,} frames extracted.")
if __name__ == "__main__":
main()
|