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[madbiologist <515865@xxxxxxxxxxxxxxxxxx>]

Your NVIDIA GeForce 7600 GS is an NV40 series card and has a VPE2 video
decoding engine.  According to the VPE2 details in the Nouveau Wiki at
http://nouveau.freedesktop.org/wiki/VideoAcceleration/

* MPEG4 and H.264 decoding is not possible via VDPAU.
* MPEG1/2 decoding is possible via VDPAU but is not implemented yet.
* Only MPEG1/2 decoding is possible via XvMC, but you will need a Kernel 3.11 and mesa-git.  The good news is that you don't need any firmware.
* To use XvMC, you need to point your /etc/X11/XvMCConfig at the libXvMCnouveau.so library (single line with the full path).

The under-development Ubuntu 13.10 currently has the 3.11.0-2.5 kernel,
which is based on the upstream 3.11-rc5 kernel.  If it doesn't already
have a new enough version of mesa it probably will by the time of it's
final release in October 2013.  If you want to install the 3.11 kernel
on an earlier Ubuntu release, you can get it in a PPA from
http://kernel.ubuntu.com/~kernel-ppa/mainline/ and instructions on how
to install an uninstall it are available at
https://wiki.ubuntu.com/Kernel/MainlineBuilds

You can install the latest mesa on an pre-13.10 versions of Ubuntu by
using the xorg-edgers PPA at https://launchpad.net/~xorg-
edgers/+archive/ppa

So it looks like your original MPEG4 use case is not possible via GPU
hardware acceleration, although I'm not sure why xv-blit is not
producing any images for you.  It's probably worth re-testing on a more
recent version of Ubuntu.

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https://bugs.launchpad.net/bugs/515865

Title:
  "Wrong" Fallback Video Renderer playing MPEG4(NUV)

Status in “mythtv” package in Ubuntu:
  New

Bug description:
  Binary package hint: mythtv

  I have mythfrontend version: branches/release-0-22-fixes [22594]

  When trying to playback a tv show created with nuvexport in xvid
  format I get the following errors.

  2010-02-01 21:32:00.018 TV: Attempting to change from None to Watching WatchingPreRecorded
  2010-02-01 21:32:00.095 TV: StartPlayer(0, Watching WatchingPreRecorded, main) -- begin
  2010-02-01 21:32:00.636 AFD: Opened codec 0x7fe414ee2860, id(MPEG4) type(Video)
  2010-02-01 21:32:00.637 AFD: codec MP3 has 2 channels
  2010-02-01 21:32:00.651 AFD: Opened codec 0x7fe414f56170, id(MP3) type(Audio)
  2010-02-01 21:32:00.662 Opening audio device 'default'. ch 2(2) sr 48000
  2010-02-01 21:32:00.662 Opening ALSA audio device 'default'.
  2010-02-01 21:32:01.901 VidOutVDPAU Error: Failed to initialise VDPAU
  2010-02-01 21:32:02.075 VideoOutputXv: Desired video renderer 'xvmc-blit' not available.
  			codec 'MPEG4' makes 'xv-blit,xshm,xlib,' available, using 'xv-blit' instead.
  2010-02-01 21:32:02.103 VideoOutputXv: XVideo Adaptor Name: 'NV17 Video Texture'
  2010-02-01 21:32:02.161 OSD Theme Dimensions W: 640 H: 480
  2010-02-01 21:32:02.507 TV: StartPlayer(0, Watching WatchingPreRecorded, main) -- end ok
  2010-02-01 21:32:02.508 TV: Changing from None to Watching WatchingPreRecorded
  2010-02-01 21:32:02.508 New DB connection, total: 3
  2010-02-01 21:32:02.519 Couldn't load deinterlace filter none
  2010-02-01 21:32:02.521 Realtime priority would require SUID as root.
  2010-02-01 21:32:02.530 Video timing method: USleep with busy wait
  2010-02-01 21:32:02.533 Connected to database 'mythtv' at host: 192.168.1.8
  2010-02-01 21:32:02.566 [mp3 @ 0x7fe4304cc820]mdb:94, lastbuf:0 skipping granule 0
  X Error: BadMatch (invalid parameter attributes) 8
    Extension:    133 (Uknown extension)
    Minor opcode: 19 (Unknown request)
    Resource id:  0x5a00001
  X Error: BadMatch (invalid parameter attributes) 8
    Extension:    133 (Uknown extension)
    Minor opcode: 19 (Unknown request)
    Resource id:  0x5a00001
  X Error: BadMatch (invalid parameter attributes) 8

  
  I get sound but no images. I assume this is a fallback am I missing something or is this a bug as this worked fine before upgraded to Karmic.

  Is this the key ??? xvmc-blit ???

  I have a Nvidia Gforce 7600 GS if that a makes a difference. Is there
  any work arounds ?

  Thanks,

  Pete.

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