[FFmpeg-user] HD > SD Down-Convert Prores Color

Kevin Wells kevwells at hotmail.co.uk
Tue May 26 22:33:07 CEST 2015

> From: kevwells at hotmail.co.uk
> To: ffmpeg-user at ffmpeg.org
> Date: Tue, 26 May 2015 18:44:48 +0000
> Subject: Re: [FFmpeg-user] HD> SD Down-Convert Prores Color
> ----------------------------------------
>> To: ffmpeg-user at ffmpeg.org
>> From: cehoyos at ag.or.at
>> Date: Tue, 26 May 2015 16:37:24 +0000
>> Subject: Re: [FFmpeg-user] HD> SD Down-Convert Prores Color
>> Unfortunately, the colormatrix filter only works with eight bit, so
>> we are back where we originally started.
> Thats a bit of a show stopper! A real shame the colormatrix filter has this limitation. Any chance this will get 'upgraded' to support 10 bit, or perhaps a patch?
> Or is there any other way to convert from bt709 to bt601 in 10 bit?
>> (My question was why you are inserting yuvy422 colourspace.)
> Using that in my command line gave me the closest conversion I could achieve, now I know why it wasn't perfect, no colormatrix 10 bit support!
> I guess it's time to throw the towel in and give up, back to avisynth :(
> Thanks for all your help Carl, appreciated.
> Kev.
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But I am currently using Avisynth to do the down-conversion and the result is really good, and Avisynth is only 8 bit, so it shouldn't matter that the colormatrix filter only works in 8 bit?

This is the Avisynth script I currently use, for reference, to get good results:

QTInput("HD_BARS.mov", quality=100, audio=2)
ColorMatrix(mode="Rec.709->Rec.601", clamp=0)
Spline36Resize(720, 576)
AssumeFPS(25, 1, false)


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