[Open-graphics] RGB/YUV converstion... importance?

[Raphael Jacquot]

Attila Kinali wrote:

> The most common used subsampling format is 4:2:0 where there is
> one U/V sample per 4 Y sample. Ie one U/V sample per every second
> pixel and every second line. 

and having 4:2:2 will get you professionnal users

> And i wouldn't impose that onto the CPU. The Matrox G200 used
> and interleaved YUV format, which mean that the player software
> had to first convert the planar data into a interleaved format
> and then showel it over to the card. In the case of MPlayer this
> made a 10-20% performance los for the whole player (comparing
> the G200 to the G400), which means that for the transfere the
> los must have been somewhere between 50% and 80%.

imho, the thing should accept both planar and interleaved
professionnal systems use interleaved, as they work from streams