I have just submitted a patch for the YUV playback code which significantly reduces the cpu used during playback using the Xv code.
Wow! Huge improvement on my 800MHz VIA C3. It looks like the cpu is juuuust a bit too slow to play DVDs or /dev/video0 with xine. The bottleneck now is probably the mpeg2 decoding; I'm not sure if there's any room for improvement there.
Ian
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