[mythtv-users] Asus Pundit Audio Problems

[Dave Stocker]

Tried a couple different things to try and resolve this. First I was
going over the settings in my kernel and realized I didn't have the real
time clock option enabled for ALSA. With this option on the audio gets
louder but is still filled with static. This is when using the audio
cable hooked from the TV card to the soundcard. 

Next I thought I would try telling the card to create its' own sound
devices (I am assuming that is what was meant by "digital loopback" in
the comments below). So I pass in the following options for the module:
oss=1 oss_debug=1 audio_debug=1
(Also tried passing in oss_rate=32000 as I was reading that this is the
rate you need for this card but it made no differencef).
I assume that you need to change the audio device setting under
mythsetup to be the new device created (in this case dsp1) but keep the
audio out device under mythfrontend to be the same as it was (dsp).
With all this setup I get absolutely no audio from live tv. (not even
interference). This is checking from both the SPDIF outs and the regular
line outs. I get the following messages back from the saa7134 module
when I start the live tv but not sure if there is anything of use:

saa7133[0]/audio: tvaudio thread scan start [1]
saa7133[0]/audio: NTSC scan
saa7133[0]/audio: scanning: M
saa7133[0]/audio: tvaudio thread status: 0x100000 [no standard detected]
saa7133[0]/audio: detailed status: ############# init done
saa7133[0]/oss: buffer config: 64 blocks / 4096 bytes, 256 kB total
saa7133[0]/oss: buffer config: 1024 blocks / 1024 bytes, 1024 kB total
saa7133[0]/oss: buffer config: 64 blocks / 4096 bytes, 256 kB total
saa7133[0]/oss: buffer config: 1024 blocks / 1024 bytes, 1024 kB total
saa7133[0]/oss: rec_start: afmt=16 ch=2  =>  fmt=0x21 swap=-

Also these messages at the time of module install (Not sure if the
timeout is normal):

saa7133[0]: board init: gpio is 0
saa7133[0]: dsp access wait timeout [bit=WRR]
saa7133[0]/oss: mixer input = TV
saa7133[0]: dsp access wait timeout [bit=WRR]

And might as well include an lsmod while I am at it:


Module                  Size  Used by
tda9887                 9800  -
tuner                  17228  -
saa7134                89196  -
video_buf              16740  -
v4l2_common             4512  -
v4l1_compat            13188  -
i2c_core               17860  -
ir_common               3204  -
b44                    18468  -

Am I doing something wrong in setting up the tuner audio? Thanks to
everyone for the help.




On Sat, 2004-04-10 at 16:54, Henk Poley wrote:
> Op zaterdag 10 april 2004 22:15, schreef Dave Stocker:
> > Been searching through the archives and seen mention of this same
> > hardware but nothing has seemed to make a difference yet. I am using an
> > Asus Pundit with an Asus TV FM card and have a couple problems with the
> > onboard audio (SIS SI7012, chip reports as Realtek ALC650 rev 2).
> >
> > The audio out from the TV card is hooked into the motherboard's CD-in
> > jack. I have muted the CD-IN under ALSA and set it to be CAPTUR. When
> > watching live TV or a recording from live TV the audio is filled with
> > static/interference. I can faintly hear the actual audio from the
> > channel if I turn the volume way up on the receiver.Using xawtv and
> > aplay /dev/dsp seems to work fine. Another topic said this problem can
> > be caused if the soundcard is not full duplex. Searching for specs on
> > this card, some say it is and some say it isn't. Does anyone know for
> > sure?
> 
> Well, people have used the audio in (loopback cable outside the case?) to 
> record sound with Pundit. I hear some complain about the quality (in the 
> sense that a dedicated soundcard will be a bit better), but not that you 
> can't hear anything. The onboard sound is full duplex.
> 
> I myself use the 'digital loopback' of my saa7134 based TV card, so I have no 
> idea about the recording quality of my Pundit. YMMV...
> 
> > The second problem is that I can't seem to get the card to output in
> > 5.1. I have the Optical SPDIF output hooked into a receiver and the
> > receiver only seems to detect 2 channels no matter what options I set in
> > myth or for the dvd player (tried both xine and mplayer). Could be some
> > ALSA configuration options I am missing. I have never played with 5.1
> > through a computer before.
> 
> MythTV per default uses OSS output (don't know about xine/mplayer). The OSS 
> emulation layer of ALSA then doesn't output the audio to the SPDIF output 
> (from what I've heard... I don't have an SPDIF receiver so can't try).
> 
> Try specifying that you want them to use ALSA output.
> 
> 	Henk Poley <><
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