[mythtv] Audio stutter on black screens

Mark Spieth mark at dclabs.com.au
Wed Dec 14 19:11:29 EST 2005

> Adam Greenbaum wrote:
>>On Tue, 2005-12-13 at 13:36 +0000, Stuart Morgan wrote:
>>>On Tuesday 13 Dec 2005 13:26, Adam Egger wrote:
>>>>It sounds like it's the commercial flagger causing it. It's the only
>>>>thing that looks for black screens or scene changes.
>>>Good theory but I'm not flagging any commercials. Commercial flagging is 
>>>useless in the UK so I don't use it at all.
>>I'm using an svn checkout from a few months back and get the same black
>>screen stuttering problem. I get it when playing back recordings. People
>>pointed me towards the mpeg decoder last time I asked, but I couldn't
>>get to the bottom of what was causing it.
> It also happens to me using an absolutely ancient CVS version from before 
> we moved to SVN.  It only started to happen "recently" though, ie a few 
> months back or less.  It's also more common on some channels than on 
> others, in particular "Lost" causes it whenever there is a major scene 
> change
> My suspicioun is that there is something iffy going on with the way they 
> cut the scenes, perhaps changing timestamps?  Haven't had any time to even 
> do basic debugging on it though
try increasing the buffers from 31 to something larger say 63 in 
videoout_xv.cpp search for 31
it could be that there is a delay in the audio stream and setting audio sync 
to 2 secs may be good.
if you can dump the stream with tcscan for the first 100 timestamps that may 
give a clue too.


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