[mythtv-users] 0.20, bad audio, HD-5500

[Noah Knowles]

Since my answer to your question is OT for this list, I've responded to the 
post you linked to in the pcHDTV forums.

But to restate my original question/plea more succinctly:

Can someone please help me figure out why I can play captured NTSC audio 
(HD-5500, /dev/dsp1) fine with sox, but in MythTV it sounds like 
low-bandwidth streaming audio? I've been struggling with this for a while and 
could use some expert guidance.


On Wednesday 18 October 2006 06:34 pm, Nathan A. Smith wrote:
> On Tue, 2006-10-17 at 21:58 -0700, noah at bonfire.homelinux.org wrote:
> > Hi, I am slowly getting a couple of HD-5500 cards to work under Mandriva
> > 2007 with Myth 0.20
>
> You're doing better than I am.....  Could you let me in on how to got
> the cards working with 2007?  I am having issues I noted here:
>
> http://pchdtv.com/forum/viewtopic.php?t=1790&sid=d9ed73f594c68d33964c6b2572
>7d2cc5
>
> Did you run into similar issues?
>
> Nasa.
>
> > but am having audio probs (also tried svn rev 11570-- no
> > improvement). This is on an ASUS P5W DH board with a Conroe 6600 and a
> > GeForce 7600GT.
> >
> > My current problem is that the NTSC audio in MythTV is awful-- it sounds
> > like compressed streaming audio on a very low bandwidth connection. I
> > know the captured audio from the HD-5500 cards is ok, because I can
> > listen to it using:
> >
> > sox -t ossdsp -w -c2 -r 48000 /dev/dsp1 -t ossdsp /dev/dsp
> >
> > and they both sound fine.
> >
> > [Also, the audio from ATSC channels is completely fine as long as long as
> > AC3 passthough is disabled-- otherwise I get (undecoded?) static. I'll
> > worry about that after I get the NTSC audio working.]
> >
> > I've tried everything I can find or think of. Extra audio buffering has
> > no effect on the bad NTSC audio. I have the following settings:
> >
> > Audio output device = ALSA:default
> > Passthrough output device = default
> > mixer device = default
> >
> > In the backend, the audio capture devices for the HD-5500 cards are
> > /dev/dsp1 and /dev/dsp2, which are created when the cx88-alsa module is
> > loaded.
> >
> > Under ALSA, my capture devices look like this:
> > ----------------
> > $ arecord -l
> > **** List of CAPTURE Hardware Devices ****
> > card 0: Intel [HDA Intel], device 0: ALC882 Analog [ALC882 Analog]
> >   Subdevices: 1/2
> >   Subdevice #0: subdevice #0
> >   Subdevice #1: subdevice #1
> > card 0: Intel [HDA Intel], device 1: ALC882 Analog [ALC882 Analog]
> >   Subdevices: 2/2
> >   Subdevice #0: subdevice #0
> >   Subdevice #1: subdevice #1
> > card 1: CX8801 [Conexant CX8801], device 0: CX88 Digital [CX88 Digital]
> >   Subdevices: 0/1
> >   Subdevice #0: subdevice #0
> > card 2: CX8801_1 [Conexant CX8801], device 0: CX88 Digital [CX88 Digital]
> >   Subdevices: 1/1
> >   Subdevice #0: subdevice #0
> > ---------------
> >
> > I'm hoping someone else has had this problem, though I couldn't find it
> > in the archives or elswhere. I'd be grateful for any suggestions. Please
> > let me know if there's more info that I could provide that would help
> > diagnose this.
> >
> > _______________________________________________
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> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
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