julius - Isn't that a Haswell processor?  Ubuntu 13.04 was released with
version 1.0.17-1 of the va-api driver.  According to
http://lists.freedesktop.org/archives/libva/2012-November/001420.html
Haswell support was not added until version 1.0.19 of the va-api driver.

According to http://lists.freedesktop.org/archives/gstreamer-
devel/2013-April/040527.html MPEG-4:2 support was present in gstreamer-
va-api 0.5.3 (earlier than I mentioned in comment #11).  MPEG4 support
seems to have been present since the original gstreamer-va-api release,
but I'm unsure of which part of MPEG4.

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https://bugs.launchpad.net/bugs/997370

Title:
  Totem does not use the va-api gstreamer backend

Status in Totem Movie Player:
  Confirmed
Status in “gstreamer-vaapi” package in Ubuntu:
  Confirmed
Status in “totem” package in Ubuntu:
  Confirmed

Bug description:
  installing gstreamer -vaapi from ubuntu repos breaks thumbnail generation in 
nautilus
  furthermore acceleration does not work in totem - cpu usage is as high as 
with software rendering.

  mplayer-vaapi works perfectly on the same system.

  gst-launch-0.10 -v filesrc location=~/test.mkv ! matroskademux ! vaapidecode 
! vaapisink
  makes it possible to use vaapi via commandline

  i did not find a way to use vaapi for mpeg4 part 2 video streams.

  and i wasnt able to find proper values for gstreamer-properties that
  fix thumbnails and acceleration in totem.

  id like to share debug information. just tell me what you need.

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