[FFmpeg-user] 422 to 420 H264 : the chroma is not good

Robert Krüger krueger at lesspain.de
Fri Sep 11 15:41:46 CEST 2015

On Fri, Sep 11, 2015 at 3:37 PM, Alexandre Fressenon <
alexandre at fressenon.com> wrote:

> Hi all,
> I have a chroma problem with a conversion.
> As input I have 2 files : 422 Uncompressed (yuv) or AppleProRes 422 (yuv),
> and I want to create a new file with H264 420 (yuv).
> But when I try to convert the sources from 422 to 420 I still have a
> problem with the chroma, and this elements is very important for me.
> The problem is not the H264 because if I already have a 420 uncompressed,
> the conversion is perfect, but my input is a 422, and QuickTime can't read
> a H264 422, so the final file has to be a H264 420…
> I know some software can create a H264 / 420 with the same chroma, and I
> would like do this part with ffmpeg.
could you describe your problem with the chroma output more precisely?

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