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

ArnoB ffmpeg at rgbaz.eu
Wed Feb 20 21:57:34 CET 2013

On 20 feb 2013, at 21:18, Paul B Mahol wrote:

> On 2/20/13, ArnoB <ffmpeg@> 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

Hi Paul,

could you elaborate your comment a bit more please?

my program reader is very unlikely the problem.
I use the foundry's Nuke to create the ProRes on OSX and read the
DPX files back in.


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