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No progress and slow detection of 4K 10bit HEVC #2274

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mifi opened this issue Dec 21, 2024 · 0 comments

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ffmpeg

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mifi commented Dec 21, 2024 •

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Detect scene changes on a 23 sec video:

minChange 0.3: took 34 sec no progress (stuck at 0%)
minChange 0.01: took about the same time, but does show progress from the beginning!

When running filters like scene change detection on 4K HEVC 10-bit footage video from iPhone 15:

ffmpeg -i IMG_7049.MOV -t 1 -filter_complex 'select='\''gt(scene,0.3)'\'',metadata=print:file=-' -f null -

The above command uses about 500% CPU and takes about 34 to complete on a 23 sec video.

Also tested other commands:

# Slow (2fps)
ffmpeg -i IMG_7049.MOV -c:v libx264 out.mov
# Fast (22fps)
ffmpeg -i IMG_7049.MOV -f null -

The biggest issue is that there is no progress being emitted at all from ffmpeg.

mifi added the ffmpeg label

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