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

Paul B Mahol onemda at gmail.com
Sun Aug 30 22:52:54 EEST 2020

On 8/30/20, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> Am Fr., 28. Aug. 2020 um 02:01 Uhr schrieb Gary Yost <gary at yostopia.com>:
>> ’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…
> Command line and complete, uncut console output missing, but see below...

I think he uses one of ffmpeg prores encoders, but yes currently provided
information is far from helpful.

>> 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
> Which commit broke the behaviour?
> This is the most important question, continuing the discussion without
> the answer makes very little sense.

No ffmpeg commit caused it, he uses different decoder for playback,
probably hardware accelerated.

> Carl Eugen
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