How do I enable opengl in vlc as video output. It's not listed as a alternative.
1) Open VLC media player.
2) Click on Tools and select Preferences… .
3) mark "All" under "Show settings" in the bottom left corner
4) Expand Video and click on Output modules. Note that DON’T expand Output modules, just click on it.
5) Set Video output module to “OpenGL” or another setting you may want
Note: These steps are for V1.0.6 (Goldeneye) but I'm sure they'll be similar for other versions as well.
OpenGL output is not yet available in the Debian/Ubuntu packages.