Comment 3 for bug 763894

Parole uses Xv output by default, but some drivers do not support it, or it is not enabled.
Though, you might tell Parole not to use Xv at all, with its "--xv false" command-line option. This setting is permanent, up to when you enable it back using "--xv true".

Reference:
http://gnubyexample.blogspot.com/2011/04/parole-media-player-xv-option-and.html

Hope it helps