[mythtv-users] Myth playback is inefficient?

Douglas Wagner douglasw0 at gmail.com
Tue May 16 23:12:13 EDT 2006

See my post about sound being out of sync when playing back video recorded
through Myth.

Fact is, anything I play outside of myth seems to work JUST fine, anything I
play THROUGH myth doesn't.

I'm REALLY hating the solution of having to drop out of myth TV every time I
want to watch an HD recorded program...


On 5/15/06, Jonathan Rogers <jonner at teegra.net> wrote:
> Dylan R. Semler wrote:
> > I have always (since 18.1) had trouble playing HD content on my mythbox
> > from mythtv.  The specs for my combined frontend/backend are
> > Dell 8200
> > nvidia 4200 64 MB
> > Pentium 4 2.23 GHz
> > 512 MB RDRAM
> >
> > Playing back a recorded HD file pauses every second or so with the
> > prebuffering pause messages in the frontend output.  However, /while/
> > mythtv is trying to view the channel, I can play the channel file
> > (2101_20060515194118.mpg) with mplayer and it plays smoothly.  Both
> > mythtv and mplayer are not deinterlacing and they both use ALSA.  This
> > leads me to believe that there is something inherently inefficient about
> > the way mythtv tries to playback video.  Has this been noticed before?
> I've certainly noticed that mythfrontend seems to use more CPU cycles
> than mplayer does to play the same HD video stream. In my unscientific
> experience, mplayer is almost always more frugal with CPU cycles than
> other players. However, it also seems to me that mythfrontend produces
> better quality playback by timing video frames more precisely and in
> deinterlacing. It would be an interesting hack to add an alternate
> playback mode that used mplayer in slave mode for more direct comparison.
> Jonathan Rogers
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