[mythtv-users] playback performance regression: show of hands

[Brian J. Murrell]

Alright, I have been struggling (tolerating, putting up with, etc.) the
playback performance regression that got introduced with 0.19.  It seems
that a lot of people here have observed the same thing.

I don't know what happened between 0.18.1 and 0.19, but the _only_ thing
I did was upgrade the myth software packages on both my BE/FE machine
and a standalone FE to 0.19 and since that upgrade both of the FE's
suffer 100% CPU usage and the associated stutters in playback.  Both of
these systems used to playback perfectly smoothly with 0.18.

This sounds like what a lot of people have been complaining about so
let's explore why this has happened.

As for my set up, both machines have an nVidia 5200 card in them.  Both
are SDTV on composite outputs.  Both run the 7676 nvidia driver.  Both
use Bob de-interlacing (much to my chagrin because a decent output
device like the G400 doesn't need it -- crappy nvidia 5200's apparently
do need it).  Other hardware specs are irrelevant since I am comparing
playback performance on the exact same setups with the only change being
from Myth 0.18.1 to 0.19.

I don't want to get into checking this this setting and tweaking that
setting because the root of this problem has to lie in the myth playback
code.  It is the _only_ thing that has changed here.

Additional evidence of Myth's poor playback performance is that using
mplayer or xine on the exact same hardware _always_ plays back without a
blip.

There is something wrong in the myth playback code, let's find it!
Please?

b.

-- 
My other computer is your Microsoft Windows server.

Brian J. Murrell
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