[mythtv-users] Playback lag when recordings start

Brad DerManouelian myth at dermanouelian.com
Mon Jan 26 19:15:28 UTC 2009


On Jan 26, 2009, at 11:05 AM, jr wrote:

> I am sure that this must have been covered before, but I have done
> searches on combinations and variations on playback, lag, pause,
> record, start, multiple tuners etc, with no joy.  I am running an AMD
> 4200 dual core, 1GB mem,  with two digital and two analog tuners.
> When a recording starts, the currently playing recording lags out for
> 30 seconds to a full minute.  Unsurprisingly, the lag is worse with
> digital than with analog.  What I was searching for was techniques and
> tweaks that might ameliorate the lag.  If anyone could point me at
> such posts, I would be grateful.

Sure. Check out any of the posts about LiveTV being slow. You should  
find a whole lot of information about what happens when starting to  
watch a program. Some of it has to do with changing channels and  
switching tuners, etc. but you'll also find information about the  
amount of time it takes to start watching video.

Also, run mythfrontend with -v all so you can see all the things it's  
doing before watching and try to find your bottlenecks there. MySQL is  
typically one - especially if the database is on the same drive as  
your recordings or doesn't have enough memory allocated to cache  
queries.

-Brad



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