Re: [MEncoder-users] Cannot achieve better picture quality with MPEG2 - help needed

Nicolas Hesler wrote:
> You can easily reproduce the color space conversion problem by taking
> any rgb24 png image sequence, and then encode it with mencoder. Compare
> the resulting image with the original and you'll see colors change far
> more than they should. It is very apparent if you use a video source
> with large flat color areas, or just a matte color. (I can provide
> samples if anyone wants them)

That's probably a good idea.

> I converted the same rgb24 pngs to yuy2 and back again to a bitmap using
> premiere to use as a reference - perceptually the colors were the same.
>
> Although, I know relatively little about color space conversion, could
> the matrices discussed on this avisynth page have something to do with
> the color shifting?
>
> http://avisynth.org/mediawiki/Convert

I don't know (in case you were hoping for an answer from me).

-Corey
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