[mythtv-users] Sound Syncronization Problems in Recording Playback ONLY

[Douglas Wagner]

Wierder yet: I'm not seeing this on PBS.  BTW it IS happening on Live TV as
well, not nearly as pronounced.  When I run MPlayer through MythTV (I
believe that's what's used to play back recorded shows by default correct?)
I do get the issue, but when I run it OUT of MythTV, I do not.  So it's not
a function of the player software either (unless MythTV uses it's own media
player to playback the MPEG stream, in which case it would be Myth's player
that would be the cause of the problem).

Did some TOP testing, looks like i'm only running 29% CPU when live TV is
playing or when i'm playing back a video through Myth.  What I DO notice is
that whether i'm running as root, have the bits set in /etc/security/ or
whatnot for Real Time scheduling, I STILL don't get a realtime thread.  I do
have the option checked in Myth TV (use realtime scheduling)...the settting
in MythFrontend's setup, main page I think.  Could that be an issue (it's
the thread's value seems to be 15, which is somewhat higher than most of the
rest of the processes, tho I do have several marked as RT, which I assume is
Real Time).

So, it doesn't look like a function of the hardware, it doesn't look like
the function of the software player (mplayer or xine).  It's either some
kind of delay that myth isn't picking up on that the externals are, or it's
something to do inside myth with the way it's syncing up audio.

I'm guessing i've come to the end of my rope on this board, but before I go
subscribe to the dev list and bother them, i'm looking for any last advice
here...

--Douglas Wagner

On 5/17/06, Steven Adeff <adeffs.mythtv at gmail.com> wrote:
>
> On 5/16/06, Douglas Wagner <douglasw0 at gmail.com> wrote:
> > On 5/16/06, Christopher Rodd <cmrodd at yahoo.com> wrote:
> > > I have this problem all the time when watching network primetime shows
> in
> > the US.  Fox never has a problem but ABC and NBC seem to give me sound
> sync
> > problems from time to time. It doesn't happen every week. Syndicated
> shows
> > on HD network stations never seem to have a problem either. I run SVN
> > versions (update every couple weeks) it has shown up in every version
> since
> > at least 0.18.  I don't use LiveTV all that often so I can't comment on
> sync
> > issue or lack thereof there.
> > >
> > > Don't just pause and restart.  Fast forwarding a few seconds resyncs
> > everything for me.  You may have to play with the number of seconds
> though.
> > >
> > > Chris
> > >
> > Just tried it, fast forward, rewind, pause, play etc.  All useless.
> >
> > Commersials are synced up perfectly, the tv show is not.  This used to
> work.
> >  Settings are the same.  I've not upgraded or changed anything since I
> > started this project.
>
> commercials are fine but the show is off? Sounds like there is a set
> delay in the mpeg stream that MythTV isn't picking up on but xine and
> mplayer are. this may be something to ask on the Dev list.
>
>
> --
> Steve
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