Baloo,

I have a couple questions for you, also I would appreciate if you could do some tests and send me the output.

Are you running Ubuntu LiveCD or an installed system?
Does this problem happen with local media files as well?

Could you run the following commands and send me the output?

1) Save a youtube video using canola
2) run:
mplayer -msglevel all=9 -vo xv <youtubevideo.pls> > /tmp/mplayer.out 2>&1
xvinfo > /tmp/xvinfo.out 2>&1

Then send me the files /tmp/mplayer.out and /tmp/xvinfo.out to my email:
eduardo <d0t> fleury <at> openbossa <d0t> org

Thanks,
Fleury