Fix silent movie detection (a bit).
Fix silent movie detection (a bit).

Still to do on GWorld movie:
 - timestamps are very wrong -- need to ask QT what unit is
 - haven't checked audio/video sync yet (QT doesn't have an xvid codec ;-)
 - still jumpy on my ibook even with small videos.
 - misses first second or so starting up.. need to cue movie (and write a test
   for this in mediaplay).
 - multiple same movie playback at once (need to reopen movie)

mpasternak/michaldtz-fixes-518-522,arifgursel/pyglet,mpasternak/pyglet-fix-issue-518-522,mpasternak/pyglet-fix-issue-518-522,kmonsoor/pyglet,arifgursel/pyglet,mpasternak/michaldtz-fix-552,xshotD/pyglet,cledio66/pyglet,mpasternak/pyglet-fix-issue-552,xshotD/pyglet,kmonsoor/pyglet,google-code-export/pyglet,google-code-export/pyglet,mpasternak/michaldtz-fix-552,odyaka341/pyglet,google-code-export/pyglet,xshotD/pyglet,gdkar/pyglet,shaileshgoogler/pyglet,Austin503/pyglet,mpasternak/michaldtz-fixes-518-522,Austin503/pyglet,cledio66/pyglet,xshotD/pyglet,Austin503/pyglet,mpasternak/michaldtz-fixes-518-522,odyaka341/pyglet,shaileshgoogler/pyglet,mpasternak/michaldtz-fix-552,kmonsoor/pyglet,gdkar/pyglet,cledio66/pyglet,arifgursel/pyglet,mpasternak/michaldtz-fix-552,arifgursel/pyglet,Alwnikrotikz/pyglet,Alwnikrotikz/pyglet,mpasternak/pyglet-fix-issue-552,google-code-export/pyglet,Austin503/pyglet,mpasternak/pyglet-fix-issue-552,shaileshgoogler/pyglet,cledio66/pyglet,Alwnikrotikz/pyglet,qbektrix/pyglet,Alwnikrotikz/pyglet,qbektrix/pyglet,mpasternak/michaldtz-fixes-518-522,odyaka341/pyglet,shaileshgoogler/pyglet,google-code-export/pyglet,Alwnikrotikz/pyglet,odyaka341/pyglet,gdkar/pyglet,qbektrix/pyglet,xshotD/pyglet,kmonsoor/pyglet,gdkar/pyglet,mpasternak/pyglet-fix-issue-552,odyaka341/pyglet,cledio66/pyglet,qbektrix/pyglet,shaileshgoogler/pyglet,arifgursel/pyglet,mpasternak/pyglet-fix-issue-518-522,qbektrix/pyglet,Austin503/pyglet,gdkar/pyglet,mpasternak/pyglet-fix-issue-518-522,kmonsoor/pyglet