[FFmpeg-user] ? About ffmpeg's prores implemention

Paul B Mahol onemda at gmail.com
Fri Aug 28 03:14:45 EEST 2020

On 8/28/20, Gary Yost <gary at yostopia.com> wrote:
> ’ve got a question about the Prores implementation in ffmpeg because I’ve
> seen some odd behavior here with FCPX (running on a very beefy 16-core Mac
> Pro with 192Gram and an Afterburner card).
> When I output files from ffmpeg in ProresLT format and bring them into FCPX,
> they stutter badly… playback is ~5fps.  But when I transcode/optimize them
> in FCPX, which creates Prores422 versions of those files, they play back in
> FCPX seamlessly.
> The ffmpeg files _used_ to play back seamlessly on this machine when I was
> doing this Jan-March, but I haven’t been using this workflow since March.
> My questions are:
> 1.  Is the Prores implementation in ffmpeg a 100% accurate implementation as
> per the Apple spec?

There is no Apple specification for ProRes. At least not official one
as open standard.

> 2.  Has anything changed in the Prores code transcoding of ffmpeg in the lat
> 4 months?

If ffplay playback is also very slow, than yes.

> Thanks!
> -g
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