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I have a 2K ProRes 4444 film scan in which every fourth frame is duplicate:

ABCCDEFFGHIIJKLL ... etc

Is there an FFmpeg command that can trim every 4th frame? Thankfully it's a silent film, so audio isn't an issue.

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1 Answer 1

Reset to default
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Use the select filter with a mod (modulo) expression to make it evaluate to zero for every fourth frame. Then reset the timestamps (setpts) and output again using prores as the encoder:

ffmpeg \
    -i input.mov \
    -filter:v "select=mod(n+1\,4),setpts=N/FRAME_RATE/TB" \
    -c:v prores \
    out.mov
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