[revasm]

At a minimum you'll need gstreamer1.0 and gst-plugins-ugly[1]. Perhaps gst-libav[2] would be an alternative to plugins-ugly.

OT: Check out http://mpv.io/. It's a forked mplayer2 with native support for libva:

  mpv --hwdec=vaapi --vo=vaapi

[1] http://gstreamer.freedesktop.org/documentation/plugins.html

[2] http://gstreamer.freedesktop.org/modules/gst-libav.html

[mhurron]

I believe it is Gstreamer 0.10.

https://bugzilla.mozilla.org/show_bug.cgi?id=806917

Gstreamer 1.0 is a work in progress.

[ushi]

Yes, that's right. Works with gstreamer0.10-ugly-plugins on Arch Linux.