[mythtv] live TV stuttering
Dan Morphis
dan at milkcarton.com
Tue Apr 6 11:07:32 EDT 2004
FWIW, I see this with a standard bttv framegrabber card. IIRC, it
started to happen after the latest ffmpeg sync. Like Hamish, I don't
see anything on the console
-dan
Hamish Moffatt wrote:
> I'm having a problem with live TV where Myth will start "stuttering".
> It'll start within a second or two of changing to a channel, else it
> will be ok. The audio and picture will pause then resume, over and over.
>
> I can always fix it by quitting back to the menu and going straight back
> to live TV (which goes to the same channel). I can usually fix it by
> switching to another channel and back again.
>
> When the stuttering occurs, there are no messages output to either the
> mythfrontend terminal or the backend log (I have -v all).
>
>
> One channel seems to cause it the most here. (Nine, for Australian
> readers.) I'm running DVB-T. I get varying bit rate reports in the log
> for this station;
>
> Audiostream: Layer: 1 BRate: 320 kb/s Freq: 0.0 kHz
> Videostream: ASPECT: 16:9 Size = 720x576 FRate: 25 fps BRate: 10.00 Mbit/s
>
> Videostream: ASPECT: 16:9 Size = 720x576 FRate: 25 fps BRate: 10.00 Mbit/s
> Audiostream: Layer: 1 BRate: 256 kb/s Freq: 44.1 kHz
>
> Audiostream: Layer: 1 BRate: 128 kb/s Freq: 48.0 kHz
> Videostream: ASPECT: 16:9 Size = 720x576 FRate: 25 fps BRate: 10.00 Mbit/s
>
> Audiostream: Layer: 1 BRate: 352 kb/s Freq: 32.0 kHz
> Videostream: ASPECT: 16:9 Size = 720x576 FRate: 25 fps BRate: 10.00 Mbit/s
>
> I have other stations using higher bit rates (eg 15 Mbit/sec video).
> There are other stations using both layer 1 and layer 2 audio. And
> others using both the same picture size and a slightly different one. So
> I can't find a pattern there.
>
> I've tried tweaking my PCI bus latency settings while it's occurring but
> it didn't help (using powertweak). I have an Athlon XP 2600+, plenty of
> RAM, fast disk etc.
>
> I'm using linux 2.6.4 with OSS. I've seen it occur with 2.4.24.
> I think it occurs much more often with ALSA. Pausing the live TV for a
> few seconds then resuming does not help.
>
> One time when it started occurring I switched to another channel, and it
> didn't go away. Then the frontend starting print messages about audio
> buffer overruns and prebuffering pauses. I haven't had that happen a
> second time though.
>
> I would welcome suggestions on how to debug this.... It's been present
> for a few months here now. I've just checked it with absolute latest CVS.
>
> thanks,
> Hamish
>
>
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