On 28/05/2025 21.27, Alex Xu wrote:
I got those "unnecessary" args from
https://trac.ffmpeg.org/wiki/Encode/YouTube They aren't important.
I think you might be mistaking CRF for CFR (constant frame rate).
Nope.
CRF is a
measure of compression, it shouldn't drop and duplicate frames. frames.
https://trac.ffmpeg.org/wiki/Encode/H.264#a1.ChooseaCRFvalue
Crf is essentially undocumented in both FFmpeg and x264. I think it means constant rate factor -- a
factor? what kind of factor? a factor in what?. I reckon frame 173 was 'late' and so, was dropped.
Then frame 174 was repeated to maintain 'crf=18' (whatever that is). I think crf is for streaming,
not transcoding, of which detelecine is part.
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