[MPlayer-dev-eng] Can mplayer output MPEG2 422/444 YUV data?

[Shachar Raindel]

On Tue, 21 Sep 2004 11:44:27 +0100, James Courtier-Dutton
<james at superbug.co.uk> wrote:
> Jason Geng wrote:
> > Hi all,
> >
> > I have seen in the mplayer homepage that it has "MPEG2 chroma422/444 support". But I can't find the related code in libmpeg2 or libffmpeg. My version is 1.0Pre5. Can anyone tell me if mplayer really can output 422/444 YUV data? Thank you very much.
> >
> > Best Regards
> > Jason Geng
> >
> 
> I doubt that you will get True YUV output from an MPEG2 decoder, because
> the MPEG2 is not stored in YUV format. DVD quality MPEG2 is stored in
> Y'CrCb 4:2:0 format.
> 
> Any other format will be using interpolation and Colour space
> conversions to get 422/444 YUV.
> 
> Some people use the term YUV when in fact they should be using the term
> Y'CrCb.
> 
> YUV is in fact different from Y'CrCb, and so people using the YUV term
> are going to confuse things if they talk to someone who understands the
> terms accurately.
> 
> Y'CrCb is a scaled and offset version of the YUV color space where Y
> represents luminance (or brightness), U represents color, and V
> represents the saturation value.

While doing a small google search about YUV422 stuff, I stumbled upon
this site, which might be of interest to MPlayer developers:

http://www.fourcc.org/index.php

Nice listing of many many video codecs, and pretty useful explenation
about some of the YUV and RBG formats, including figures and other
useful stuff. One might want to add this to the tech docs.

     Cheers,
     Shachar