[mythtv-users] jerky video and sound problems with live tv and recorded tv internal player only.

[Tom Lichti]

On Mon, Mar 7, 2011 at 11:55 AM, Braindead <Braindead at diablops.com> wrote:
> On Fri, 4 Mar 2011 07:14:49 -0600 Carl <crazy at wi.rr.com> wrote:
>> I have a similar problem.  I just upgraded from 0.20 to the current
>> top of the git repository and the playback of everything (movies,
>> recordings, music) is too fast (expect LiveTV where the video is
>> correct but the audio cuts in and out).  The pitch of the audio is
>> correct so the sample rate should be right but it skips forward
>> staying in sync.  With the version upgrade I replaced a dead 7600gs
>> with a geforce 210 so I could use VDPAU but the problem occurs
>> whether it's enabled or not.  My CPU is also an Athlon 64 X2 3800+
>> and the audio device is an Nvidia MCP51 HDA with a Realtek ALC883
>> codec and I use the SPDIF output but the problem still happens even
>> if I use the analog output.  If I play any of the recordings with
>> Xine there aren't any problems.
>>
>> When I use debugging I get a lot of "Video is 4.0644 frames behind
>> audio (too slow), dropping frame to catch up" followed by
>> "'video_output' mean = '20208.52', std. dev. = '16111.62', fps =
>> '49.48'"  despite the fact the source video is 30 fps and when I
>> watch an HD progressive scan video it plays back at about 85fps.
>
>
> Your setup sounds very similar to mine.  I'm currently not having any problems since moving to VDPAU.  I sending audio out to spdif and analog, I've noticed the analog is a bit behind the spdif but it's clean and I just use one or the other not both anyway.
>
> Are you certain you have mythtv compiled with VDPAU support?  The playback profile will show up whether you have that enabled or not, although I expect you would have seen errors.
>
> Have you tried playing back recorded shows via mplayer?  I think it really helps to narrow down the problem, if you can confirm it's with the internal player then messing around with the playback profiles may be the best bet.

I haven't followed the whole thread, so forgive me if I missed it, but
I recently experienced horrible jerkiness and audio out of sync (by up
to 5 seconds!) and it was all down to an Nvidia driver update. I was
running 256.35 on one of my ION frontends, I upgraded to 260.19.36,
and playback went into the toilet. That was *all* I changed. After
reverting back to 256.35, playback is rock solid again. So there may
be something there, if nothing else pans out.

Tom