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

[Robert Krüger]

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?