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[Sasquatch <sasquatch@xxxxxxxxxxx>]

I'm having this same problem, but very strange results. On my PC, with
an nVidia card, I have no problems. I can run a VirtualBox VM, then open
a video file with SMplayer, no transparent video output. Xv works just
fine too. Compiz-Fusion is running (I use the Xfce environment). My PC
has the latest nVidia driver installed through the VDPAU ppa though.

My laptop on the other hand, does have this problem. The video card is
an ATi X1400 Mobility Radeon and I'm forced to use the Open Source
driver for it (xserver-xorg-video-radeon from bdrung's ppa, version
1:6.12.99+git20090629.f39cafc5-0ubuntu1~ppa). It doesn't happen until I
run a VM. After I ran a VM, the window preview boxes are also showing
some transparency where it shouldn't. A reload of Compiz fixes this for
a moment (until I run a VM again), but it doesn't fix SMplayer. Even
switching back to Xfwm4 as window manager doesn't get it going. SMplayer
isn't transparent anymore, but the video is now black. Using the
XLIB_NO_ARGB_VISUALS=1 option isn't a real fix. I've seen on other
sites, including the SMPlayer forum that it's a Qt problem. Is Qt 4.5.3
in Karmic now? Can anyone check if that does not have this issue? If
it's fixed with that, Qt 4.5.3 should be backported to Jaunty.

-- 
Video corruption with composition
https://bugs.launchpad.net/bugs/364764
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