[mythtv-users] 30 second skip == stutter

[Doug Larrick]

John Patrick Poet wrote:
> 
> With the latest CVS, I am getting the best, smoothest video playback of 
> HD matterial I have ever had.  It is basically perfect!

Good to hear!  That's my goal.  I want to try realtime scheduling of the 
videoout (and maybe decode) thread, so it's perfect for heavier loads 
and/or less CPU.  But I think all the pieces are there now.

> However, skipping forward or backwards causes the video to stutter for 
> several seconds.  I am currently using ALSA->OSS emulation via a S/PDIF 
> connector.  When I use pure ALSA, the stutter is not near as bad, but I 
> get segfaults and aborts.
> 
> Doug, here is the log from mythfrontend with "-v playback".  Is there 
> anything I can do to "tune" the A/V sync?

I think the problem here is that we're not managing to seek to exactly 
the same spot in the video and audio streams, and so it takes a little 
while for them to be back in sync.  I have not done any investigation to 
confirm my suspicion.

I also think there's something odd going on with your setup that I don't 
see here... you seem to get audio timestamps that are way off after a 
seek; the patch that pins the adjustment to 200 frames masks this 
problem, but doesn't actually fix it.  Unfortunately without being able 
to reproduce it there's not a lot I can do except offer encouragement.

-Doug
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