[FFmpeg-user] prores4444 to dpx: colourshift & translation

[Paul B Mahol]

On 2/20/13, ArnoB <ffmpeg at rgbaz.eu> wrote:
> Hello!
>
> I'm trying to convert a prores4444 quicktime with gamma 2.2 to
> a dpx sequence with the following command:
>
> % ffmpeg -i prores4444g2.2_v01.mov prores.%02d.dpx
>
> In the resulting DPX sequence I have the following errors:
> -the DPXs are tagged as being sRGB. manually switching my program's
> reader to 2.2 makes them look ok;
>
> -there is a colourshift of around 120DEG. My prores file contains a
> colourwheel
> so it's easy to spot. green becomes blue, red becomes green and blue
> becomes red;
>
> -also there's a translation in the X axis of +277 pixels. the missing part
> is wrapped around and visible on the other side:

You are doing YUV444p10 to RGB48 conversion.

So either one of this is broken:

1. colorspace conversion
2. prores decoder
3. your program reader