On Fri, 23 Jun 2006 11:59:56 +0100
Dieter <[EMAIL PROTECTED]> wrote:
> What I don't know is how much CPU will be needed for video. I don't have
> a handle on how much the OGC GPU will do and how much the CPU will have to do.
For the video case, the X server is only shuffling memory around.
No decoding or anything cpu intensive. But this means that it
needs to do a lot of I/O which is the bottle neck these days.
Of course, you can offload some parts of the decoding with
XVmc, but that functionality is not widely spread and doesn't
work for all codecs.
It is another matter if you want to do decoding on this cpu too.
Then you cannot have enough power. Current schemes like h.264 need an
awfull lot of CPU time that you'd need something in the range
of 2GHz for any decent video resolution. Modern schemes that
are wavelet based exceede this by a factor of 10 or even more.
Attila Kinali
--
心をこめて聞け心をこめて話せ
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