[mythtv-users] Problem with VDPAU after broadcaster changes it encoder

David Wong david.wong at marvel.com.hk
Fri Jun 12 10:45:33 UTC 2009

----- "Mark Kendall" <mark.kendall at gmail.com> wrote:
> 2009/6/6 David Wong <david.wong at marvel.com.hk>:
> >  I still having problem on HD source with trunk and vdpau. I've
> tried 185.18.14, still the same. In my
> > environment, mplayer svn could play it with "-mc 2" option, using
> vdpau acceleration, so I think there
> > is nothing wrong with vdpau itself.
> > see http://www.nvnews.net/vbulletin/showthread.php?t=133915
> > People could play it on xine-vdpau too. I checked 'wait for seq
> start header' too, it should be already on.
> >
> >  I've filed a mythtv ticket #6603,
> http://svn.mythtv.org/trac/ticket/6603
> >
> >  Please suggest how should I help and debug. I've compared
> libavcodec of mythtv trunk and mplayer svn.
> > There are quite some differences on H264 and vdpau, at least about
> David
> I'm not sure there's much else you can do at this point.
> Mythtv's VDPAU code is currently getting a bit of a re-work which
> will
> involve some regression testing - hence I don't want to touch ffmpeg
> code at this point and throw another (sizeable) variable into the
> mix.
> For reference, my current plan of attack is:-
> 1. Break out VDPAU code from Xv/XvMC (almost done).
> 2. Refactor X11 display code to minimise code duplication and fix
> some
> xlib/xcb crashes people are seeing.
> 3. Change the way we create/handle the VideoMixerRender (add support
> for blur, denoise etc, reduce memory consumption for progressive
> streams, remove annoying vdpau interlacing error message).
> 4. Finally commit some more video buffer memory optimisations (for
> 256Mb cards).
> If that means nothing to you, the key message is that it's going to
> be
> 2-3 weeks before I seriously think about testing some ffmpeg updates.
> If, in the meantime, someone wants to produce a test patch that
> updates the ffmpeg elements of the code, then that may speed
> everything up at some point and would be much appreciated.
> regards
> Mark
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Hello, Mark,

  I have found the cause. It is libavcodec setting wrong 
parameters to vdpau. See http://svn.mythtv.org/trac/ticket/6603
 for detail.

  It also fix the problem on 0.21 vdpau backport, for those who
may interested.


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