[mythtv] PVR350, mythmusic, and mpeg2 encoding audio for playback

John Kondis jkondis at yahoo.com
Sat May 14 21:06:16 UTC 2005

I had the same problem.  Sadly, I have only 2 pci
slots, now they're both filled (350 + sound card) and
I can't put a USB2.0 card in.  Go for it!  Write that
tool/sound driver!

Might be a bit cpu-intensive, and I have to wonder if
the 350's decoder will be expecting mpeg video at the
same time (dummy video stream?), thus complicating how
mythmusic handles its own graphics.  How does the
decoder work?  Can you keep it in regular
"framebuffer" mode while you send it video that is not
displayed?  Seems similar to pegging the alpha to 255
so that mythmusic can do its graphics stuff normally.

Then you'll have to figure out how to adjust volume
through such an encoder.  Currently myth can't control
volume on the mpeg2 streams sent to the 350's decoder,
AFAIK, but a live encoder shouldn't have any problem
changing the volume of the stream.

--- Miah Gregory <mace at darksilence.net> wrote:

> On Sat, 2005-05-14 at 16:25 -0400, Isaac Richards
> wrote:
> > On Saturday 14 May 2005 04:23 pm, Miah Gregory
> wrote:
> > > Hi,
> > >
> > > Been looking through a few posts, and it seems
> that mythmusic can only
> > > output to the soundcard, and nothing else. I'm
> wondering how much
> > > mileage there is in feeding the audio output
> through an MPEG2 encoder
> > > and into the PVR for output?
> > >
> > > I'm willing to have a go at this, if I can get a
> few pointers.
> > 
> > Why would you do that, instead of just using a
> jumper cable from the pvr-350 
> > to the soundcard?
> I have no soundcard? :-)
> More seriously, I don't have any speakers or
> anything either and rely on
> the TV for audio playback.
> -- 
> Miah Gregory
> > _______________________________________________
> mythtv-dev mailing list
> mythtv-dev at mythtv.org

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