[mythtv-users] 32khz AC3 Streams was: Sound problem with AC3 passthrough

[Rob Baumstark]

On 6/6/06, Steve Hodge <stevehodge at gmail.com> wrote:
> On 6/7/06, Meatwad <meatwad.get.the.honeys at gmail.com> wrote:
> > Rob Baumstark wrote:
> > ALSA is resampling to 48k because my Denon 3806 on-screen display is
> > showing PCM 48,000 but some funkyness has happened between now and then
> >
> > first, i tried -ao alsa:device=default (ok)
> >
> > then i tried above with -ac hwac3 (still ok) as seen in the second
> > bracket of output
>
> Is your receiver showing PCM 48000 with this option? Also, according
> to your outputs, you used -ao alsa:device=digital in this case.
>
> > WITH -ac hwacs, jittery scratchy garble which could only be 32k arriving
> > at the receiver (see 4th block of output)
>
> The only differences I can see are a slight change in buffer size and
> the fact that this time you used -ao alsa:device=default.
>
> Can you try the following command lines and let me know what happens
> (including what the receiver says):
>
> mplayer -vo xv -ao alsa:device=digital -ac hwac3 ~/test.mpg
> mplayer -vo xv -ao alsa:device=digital-hw -ac hwac3 ~/test.mpg
> mplayer -vo xv -ao alsa:device=mixed-digital -ac hwac3 ~/test.mpg
> mplayer -vo xv -ao alsa:device=dmix-digital -ac hwac3 ~/test.mpg
>
> Steve
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Ok - I've ran the above 4 tests.

Using digital and mixed-digital results in garbage playback.  Scratchy
popping useless stuff that doesn't sound good for the speakers.  The
receiver indicates it is receiving a PCM stream at 48khz for these
tests.

With digital-hw or dmix-digital, I get high-speed/high-pitch audio
playback, and the receiver indicates it is receiving a dolby-digital
stream.