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

[Douglas Wagner]

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.

Noticed I forgot to include anything related to my sound setup:

First, i'm using "ALSA:default" for the device and "default" for the mixer,
I tried setting device to /dev/dsp and I get the same thing...thinking about
it, it wouldn't have anything to do with the device would it?

Again, sound is perfectly synced up via live TV watching, and externally in
Xine, so is this an MPlayer problem?

This isn't making alot of sense to me: There are no errors being spit out by
mythfrontend, the actual stream (mpeg) is synced up through an external
player, even if I use MPlayer externally I get synced audio and video (there
might be a 1/10th second delay but it's practically unnoticeable unless
you're looking for it..and even then i'm unsure).

It's something DIRECTLY related to MythTV playing back recorded content.
Pretty much any other method of playing video (whether live or externally)
works flawlessly.

What do you guys need to see to help me with this?  .asoundrc?  Cuts from my
logs or settings?  Anyone have ANY clue what might be going on?

--Doug

On 5/16/06, Christopher Rodd <cmrodd at yahoo.com> wrote:
>
>
>
> Douglas Wagner wrote:
>
> Ok,
>
>      I've accepted my fate.  I'm GOING to get yelled at for posting this.
> I know for a fact i've seen this issue come up several times in the recent
> past but for the LIFE of me I can't find the threads.  So, i'm going to ask
> this again.
>
> Problem:  When I try to play back a recorded ATSC HDTV show (only those,
> it seems, shown in high def, see "oddities" next) the audio lags behind the
> video by about 3 to 5 seconds.  Meaning that you see the people on the
> screen speaking and then hear the audio.  The problem GOES AWAY if I drop
> out of mythtv, and load the recorded video through Xine.  So, my solution so
> far has been to go into MythTV, to the recorded shows section, find the show
> and date, and then go to my video directory and use xine to play it.  Of
> course this cuts out my remote (I don't have xine setup on it yet) and the
> nifty features of MythTV, so i'm really not liking the solution.
>
> Oddities: Several:  1) this happens ONLY on shows recorded in true HD.  My
> PBS Shows, which are shown in HD but only come out to about 600 Meg in size
> (while a show of the same length on ABC Comes out to about 6 - 7 Gig), work
> just fine when played back via Myth.  So, Callou and Clifford for my kids
> are fine but alias and boston legal all lag sound (for instance).
> 2) When i'm OUT of mythtv another player plays the audio/video just fine,
> so it has something to do with how Mythtv is streaming the audio in to the
> video.  As I said above xine has no problem.  I guess more to the point,
> it's how MPlayer streams audio/video as I think that's the default setup for
> Myth playback.
> 3) This DOES NOT happen in live TV, when myth is playing live TV
> everything works JUST fine.  Sound/Video syncronization is no issue.
> 4) THIS WORKED!!! I've not upgraded, i've not changed settings, i've not
> done anything I can think of (I did have to re-setup myth due to a database
> channel issue, but I THOUGHT I set it back the same way).
>
> Hardware: pcHDTV 3000 card with ATSC Signal connected directly to it,
> nothing comming out of the card (audio and video are recorded streamed over
> the PCI bus, not using any patch wires).  Fedora Core 5, Pentium IV 2.8GHyper-Threaded, 1G memory, ~400g harddrive, all 7200 RPM (IDE, not SATA).
> Soundblaster Live! Value Digital sound card.
>
> Software: MythTV v0.19, Kernel Version 2.6.16_2096 SMP.  Mplayer I believe
> is setup as the default playback software for recorded streams (it's the
> default setting, I don't think i've mucked with anything).
>
> HELP!  I REALLY don't want to have to keep dumping out of MythTV to play
> recorded shows.  I'm going to try to re-setup myth to use Xine via the WIKI
> instructions sometime later this week, but for the moment, i'm hopelessly
> lost.  I'm SURE it's something stupid.  Oh, and no, pausing and restarting
> doesn't seem to help either.
>
> Any assistance would be MOST apprecaited.
>
> --Douglas Wagner
>
> ------------------------------
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>
> 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
>
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