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

[Gary Yost]

Thanks Paul.  I’ll do more testing tomorrow and will get back to you with further data.

> On Aug 27, 2020, at 5:14 PM, Paul B Mahol <onemda at gmail.com> wrote:
> 
> On 8/28/20, Gary Yost <gary at yostopia.com <mailto: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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