[mythtv] AV-Sync problem

[David Wong]

----- "Michael T. Dean" <mtdean at thirdcontact.com> wrote:
> On 04/23/2009 03:23 PM, Ed W wrote:
> > I *think* this is an issue I see on UK DVB on any black scenes - I
> had
> > presumed that the gap between video and audio was getting too large
> (but
> > still acceptable).  I haven't had a chance to debug this in any
> detail
> > though
> 
> Do you guys have
> 
> Extra audio buffering
> Enable this setting if MythTV is playing "crackly" audio and you are 
> using hardware encoding. This setting will have no effect on MPEG-4 or
> 
> RTJPEG video. MythTV will keep extra audio data in its internal
> buffers 
> to workaround this bug.
> 
> (In trunk, the help is:
> Enable this setting if MythTV is playing "crackly" audio.  This
> setting 
> affects digital tuners (QAM/DVB/ATSC) and hardware encoders.  It will
> 
> have no effect on framegrabbers (MPEG-4/RTJPEG).  MythTV will keep
> extra 
> audio data in its internal buffers to workaround this bug. )
> 
> enabled?  It's whole purpose it to work around the issue you describe.
>  
> If it is enabled, perhaps the real-world conditions have gotten worse
> 
> over the years.
> 
> Note, also, that's not the setting:
> 
> Aggressive Sound card Buffering
> If enabled, MythTV will pretend to have a smaller sound card buffer
> than 
> is really present.  This may speed up seeking, but can also cause 
> playback problems.
> 
> Which does basically the opposite of Extra audio buffering.
> 
> Mike
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Yes, extra audio buffer is enabled,
and Aggressive sound card buffering is off.

The real world is really harsh. I checked the PTS of audio and video packet,
they are almost 2 seconds apart. Fortunately, it is just low bit-rate SD channel.

David.