[FFmpeg-devel] Fw: Re: [issue986] Truemotion2 decoder - chroma issues

[Jason Garrett-Glaser]

On Thu, Apr 23, 2009 at 12:52 PM, Michael Niedermayer <michaelni at gmx.at> wrote:
> On Thu, Apr 23, 2009 at 12:36:20PM -0700, Jason Garrett-Glaser wrote:
>> > The problem is that tm2 yuv seems to use 9bit for U & V this makes
>> > it impossible to fit in any of the common pixel packings
>> > thus it seems this has to be to converted in the decoder unless you
>> > would use 16bit YUV420 but this seems really silly.
>>
>> 9-bit U/V? ?What is it using, YCgCo?
>
> no, is anyone using YCgCo ? I tried it in ffv1 once and it was
> crap compared to normal YCbCr in terms of compression IIRC.

Is it better than RGB?  I recall that YCgCo with 9-bit U/V can
represent all RGB color values.

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