[mythtv] Channel change slow....

[Joel Utting]

On Sun, 2005-07-31 at 20:11 +0100, Ed W wrote:
> >RingBuffer.cpp
> >
> >There are a few places where it waits for a full 256K before doing
> >anything. 30 frames may take as little as 100K so this can account
> >for about 2-3 seconds. And some of the timeouts on waiting for the
> >buffer to fill are LONG, and there is no mechanism for flushing to
> >disk based on time rather than buffer fill... You might also want to
> >start live TV at 90% of real speed and speed up to 100% when the
> >excess buffer has grown to at least 2-3 MB ahead.
> >  
> >
> 
> I think also there is a lot of sync stuff waiting for playback to pause 
> and audio to pause, etc, etc.  I have tried a few patchsets on this in 
> the past and also reduced the buffering and you can drop the wait times 
> by a couple of secs easily.  I haven't submitted anything because I 
> don't really understand it all that well so it's a bit of a hack
> 
> I hope someone who understands this better will do some optimisation 
> because it's currently really wasting a lot of unneccesary time.
> 
> Finger crossed...
> 
> Ed W
> 
> P.S.  I can't see any reason to sync on the audio pausing...

I spent some time playing with RingBuffer.cpp, but I couldn't affect
channel change speed at all (just managed to screw up myth in various
ways) - even a hack would be good - any suggestions as to what to
change ? Can I see your hacked file ?

Bye - Joel.