[mythtv-users] VDPAU decoding pauses/vdpaubuffersize filter (was Re: Playback problem -- random short pauses)

Michael T. Dean mtdean at thirdcontact.com
Mon May 23 16:50:17 UTC 2011

On 05/23/2011 12:42 PM, Steven Adeff wrote:
> On Mon, May 23, 2011 at 12:29 PM, Michael T. Dean wrote:
>> Also, it's possible that specifying videobuffersize=32 in the filter
>> section of the VDPAU-decode playback profile may work around the VDPAU
>> video buffer starvation issue (#2), but that may "undo" all the changes
>> that have allowed use of VDPAU on low-memory video cards (like 256MB
>> cards)--you'll likely need a 512MB or greater card.  We're still testing
>> this, and would appreciate users providing feedback about whether it
>> helps or not.  This may be why you're not seeing the VDPAU issues, Paul
>> (so please let us know if you have specified videobuffersize or other
>> filters).
> Mike, Thank you for clearing these up for us, it's comforting to know
> the issues are at least known by the dev's, and from the sounds of it
> the reasons for the issues as well.
> The big question we as users have at this point is whether these are
> concerns that are on the minds of the developers to be addressed? We
> understand the time frame is open.

Yes.  Even we developers don't like random short pauses during playback.  :)

The right people are working on it--and spending a /lot/ of time on it.  
Lurk in #mythtv in IRC and you'll see Taylor Ralph and Mark Kendall 
talking about and investigating it for hours each day (and working on 
both 0.24-fixes and master).

> As for the videobuffersize question, I have various systems that
> already have videobuffersize=32 set which has helped with playback of
> some x264 content but seems not to eliminate issue 2). I will play
> further with this. Is there a ticket or thread to report our findings

There's now a thread for it.  :)  (And thanks for the feedback, Steve 
and Paul.)


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