[FFmpeg-devel] RoQ colorspace inflated

[Vitor Sessak]

Mike Melanson wrote:
> Hi,
> 
> I was looking at the RoQ video decoder. I noticed that the colorspace is 
> set as YUV444P. Natively, RoQ video is YUV420P. I see that the decoder 
> unpacks the YUV420 pixels and manually upscales the chroma samples. Is 
> there a good reason for this?

Yes, actually the decoder use YUV420 to store the codebooks but does 
motion compensation using full YUV444 (or in the original decoder, RGB). 
  Eric Lasota (who sent the patch for this change) sent a sample that 
didn't decoded with artifacts in the YUV420 colorspace, but correctly in 
Quake3. See 
http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2007-June/030404.html 
and for the sample http://icculus.org/~riot/redbox.bz2 .

-Vitor