[mythtv-users] problem with audio underruns on 720p only

Michael T. Dean mtdean at thirdcontact.com
Mon Dec 8 06:20:43 UTC 2008

On 12/07/2008 11:43 PM, Jeffrey J. Kosowsky wrote:

>  Michael T. Dean wrote at about 23:27:16 -0500 on Sunday, December 7,
>  2008:
> > Note, also, that--AFAIU--recently there have been a lot of reports
> > of streams in the wild that seem to have enough offset between the
> > audio and video streams (not A/V sync offset during playback, but
> > offset of the streams in the transmission), that Myth (and likely
> > most other media players)--which only decodes so far into the
> > stream--is unable to keep sufficient audio and/or video (whichever
> > is ahead of the other) buffered to play back without pauses.  In
> > other words, it's quite possible the OP's provider is sending out
> > a--well, let's just call it--"less than optimal" stream.
>  I am having very similar problems. But since I am watching OTA, I
>  don't have any one provider and I'm not sure they would all be so
>  simultaneously guilty.
>  Could the catpture card be doing something funky in displacing audio
>  and video streams? (I have a pchdtv5500 card)
>  Also, since I see this on ALL digital streams (HD or SD) could my
>  relatively underpowered system be exacerbating an underlying problem
>  and perhaps causing it to show itself more bodly?
>  I have an old P4 2.8GHz CPU on an Asus P4PE motherboard with a new
>  GeForce 6200 AGP (running at 4x) with 256MB DDR.

If you're seeing it on all streams, it's probably some other issue.  I'd 
suggest starting with 
http://www.mythtv.org/wiki/index.php/Prebuffering_pause , and if--when 
you find your cause/solution--you need to add another case, your doing 
so would be much appreciated.  :)


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