Do you have a multi screen setup?
I've the same problem on lucid using intel drivers and xv.
XV doesn't work using gstreamer or vlc.
When disabling the 2nd monitor xv works fine in vlc, but gstreamer seems to
activate the 2nd monitor uppon playback.
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gstreamer unable to init xvideo output (
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/36546019/Dependencies.txt
** Attachment added: "XsessionErrors.txt"
http://launchpadlibrarian.net/36546020/XsessionErrors.txt
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gstreamer unable to init xvideo output (xvimagesink)
https://bugs.launchpad.net/bugs/49375
