[FFmpeg-user] ffmpeg architecture question #2

Edward Park kumowoon1025 at gmail.com
Fri Apr 24 21:02:52 EEST 2020


> Output is actually 29.97p with 5th frame duplicates . The repeat field flags
> are not taken into account.

> If you use direct encode, no filters, no switches, the output from soft
> telecine input video is 29.97p, where every 5th frame is a duplicate
> e.g
> ffmpeg -i input.mpeg -c:v rawvideo -an output.yuv
> But you can "force" it to output 23.976p by using -vf fps
> Is this what you mean by "forward the correct time base" ?

I think 5th frame duplicated is only accurate for shorter durations, I think you will see if you look at the timestamps of each frame over a longer period. They advance by 2 60fps 'ticks', 3 ticks, etc as if the duration was determined using rf and tff flags.

Ted Park

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