[mythtv] Solving my performance problems...

[Steve Brown]

Jason Hoos wrote:

>
>
>Oddly I have noticed that the stutter problem occurs regularly on a 720p
>HDTV station, but it doesn't occur on 1080i station.  Those results aren't
>conclusive; since I only have two stations I can get right now I can't tell
>whether it has more to do with how the streams are encoded than with what
>resolution they are.  Especially since the 720p station is the one that has
>the GOP issues I've been discussing on another thread.
>
>Jason
>
>  
>
I found that the difference to be more whether or not the stream is 
really hdtv or just up-converted standard res tv. These tests have all 
been from streams stored from disk. I wanted to eliminate the pchdtv 
stuff from the equation.

I've been having some problems with my the SATA driver on 2.4.22 
oops'ing now and so, for a lark, I cooked up a 2.6.0. Getting the nvidia 
closed-source xvmc driver working was the hardest part. No stuttering on 
my full hdtv test stream. On 2.4.22, it dropped out once every few 
seconds, but on 2.6.0 it ran for several minutes with NO sound 
underruns. I'll try a longer session, but in the several minutes, the 
sound queue was stable between about 8k and 12k samples. This is with a 
debug version and writing a 10MB log file. I suspected the updated 
(better) SATA disk driver, but hdparm -T and -t gave comparable results. 
Must be the scheduling.

I'll check the status of the pchdtv driver on 2.6.0 and if it's running, 
try that.

Go figure,

Steve