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

Kevin Wells kevwells at hotmail.co.uk
Tue May 26 23:47:24 CEST 2015

> To: ffmpeg-user at ffmpeg.org
> From: cehoyos at ag.or.at
> Date: Tue, 26 May 2015 21:10:47 +0000
> Subject: Re: [FFmpeg-user] HD> SD Down-Convert Prores Color
> Kevin Wells <kevwells <at> hotmail.co.uk> writes:
>>> (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!
> Since yuyv422 is eight bit, 10bit colormatrix support
> wouldn't help with your command line...
> Did you test my last command line? Does it work?
> Carl Eugen
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Hi Carl, your last command:

ffmpeg -i HD_BARS.mov -vf colormatrix=bt709:bt470,scale=pal -movflags +write_colr -color_primaries smpte170m -colorspace bt470bg -vcodec proves out.mov

At first all looks good, until I apply a gamma filter to it and turn it up, exactly the same issue as we started with, lots of artefacts have been introduced.


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