[mythtv-users] What do I have to do to get HD working?

Steven Adeff adeffs.mythtv at gmail.com
Fri Apr 14 21:59:30 UTC 2006


On 4/14/06, Kevin Kuphal <kuphal at dls.net> wrote:
> Michael T. Dean wrote:
> > On 04/14/2006 05:36 PM, Kevin Kuphal wrote:
> >
> >> Kevin Kuphal wrote:
> >>
> >>
> >>> I'm about at my wits end.  I just purchased a P4 3.2ghz HT to do HDTV
> >>> playback in software but no matter what I do, I get continual studdering
> >>> and "Video X frames ahead of audio" on my HD playback material.  This
> >>> happens on my MX4000 PCI video card system, my ATI 9100 IGP video card
> >>> system, and my Unichrome Pro video card system.
> >>>
> >>> Everything I read said that a P4 3.2 is enough to do HD but nothing I do
> >>> can get it to work.  I'm running the 2.6.15 smp kernel but that almost
> >>> seems to make it worse.  With the non-smp on my Unichrome system it
> >>> plays back but only at about 17-20 fps.  With the smp kernel, it does
> >>> the 29-30 but jumps and skips complaining about the video ahead of audio.
> >>>
> >>> Please, anyone have any help?
> >>>
> >> And a little more, I can duplicate the 17-20fps setting when I set my
> >> audio device to something wrong or if I disable audio in the BIOS.  Is
> >> this possible some kind of ALSA problem maybe?
> >>
> >>
> >
> > Hmmm.  20fps is 2/3 of 30fps and 32kHz is 2/3 of 48kHz....  Perhaps your
> > ALSA device is playing a 48kHz stream (which you're likely to see in
> > HDTV) at 32kHz?
> >
> > What audio device are you using for playback?  Assuming you have ALSA
> > 1.0.9 or above, try "ALSA:default", which will use the "plug" conversion
> > plugin to automatically convert sample, rate, and format as required for
> > your sound card.
> >
> Normally I use ALSA:spdif but I tried ALSA:default with the same
> results.  If I play it with mplayer it reports that the audio is
>
> Opening audio decoder: [liba52] AC3 decoding with liba52
> Using SSE optimized IMDCT transform
> AC3: 2.0 (stereo)  48000 Hz  384.0 kbit/s
> Using MMX optimized resampler
> AUDIO: 48000 Hz, 2 ch, s16le, 384.0 kbit/25.00% (ratio: 48000->192000)
> Selected audio codec: [a52] afm:liba52 (AC3-liba52)
>
> I don't have any .asoundrc (never needed it).  The system I'm working on
> now is the Unichrome Pro system using the internal snd_via82xx driver.
> I have a Turtle Beach riviera I could throw in there if I need to but
> the results have been the same no matter what I've tried

so does it play right in mplayer?

--
Steve


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