[theora] Theora encoder performance

[Mircea Gliga]

ogg.k.ogg.k at googlemail.com wrote:
>> webcam encoded, and then decoded using theora. As you can see there are
>> some strange
>> colors overs there ( looks like edge detection  :-D ).
>>     
>
> I'd guess that the YUV to RGB color conversion code is not clamping
> where it should.
> See the color space docs in the Theora tarball (color.html).
>
>   
You were right, there were values of RGB, larger or smaller than 255.
    Thank you!

Mircea
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