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No input sound on PVR-250
http://forums.linhes.org/viewtopic.php?f=1&t=1781		 Page 1 of 1
Author:  JoJa15 [ Sun Jun 20, 2004 8:29 am ]
Post subject:  No input sound on PVR-250
When I try to record a T.V. show or watch Live T.V. I hear no sound. These are the steps I have tried to resolve the problem:

(1) I played a MP3 to verify it was not my sound out that was not working. I heard sound so my sound out is working great. Sound out is coming from AC97 on board audio.
(2) I ran alsamixer and made sure that all channels had volume and that none of the channels had MM (mute) above them.
(3) I ran mythtv-setup and tried all the different sound processor options i.e. dsp, dsp0, dsp1, dsp2, and dsp3.
(4) I tried test_ioctl and made sure that volume was 65000 and mute was 0.
(5) I tried the following:

Code:
cd /usr/src
# The ivtv compile needs the src files.
tar xvfj linux-2.4.25-chw.tar.bz2

cd /usr/local/lib/ivtv/driver
make clean
# I suppose I could have used 'make install' but I was testing
# and didn't want to add to my problems.
make

cp msp3400.o /lib/modules/2.4.25-chw/kernel/drivers/media/video/
# And answer yes to overwrite the existing file.


Despite trying all of the above I still have no sound. My next step is to try the following but I have some questions about it:

test_ioctl -v input=X output=Y

Where X and Y are numbers that I try differently each time.

Here are my questions:

What do input and output actually map to? Is there a known range? I don't want to keep trying in desperation and starting trying X=35, and Y=110.

Do I need to reboot each time I make that setting?

Is there anyway to check and see what dsp my PVR-250 is using i.e. dsp, dsp0, dsp1, etc. without having to guess?

Each time I change the dsp using mythtv-setup do I need to reboot?

Is there anything else I should try or that I missed to get sound input working?

Any help would be much appreciated! I am so close to being able to record shows on my KnoppMyth box.

Best Regards,
John
Author:  Xsecrets [ Sun Jun 20, 2004 8:51 am ]
Post subject: 
what kind of input source are you using? coax, svid, composite?
Author:  JoJa15 [ Sun Jun 20, 2004 11:09 am ]
Post subject: 
I am using the composite input on the PVR-250. I am using Composite4 for the video input in MythTV.

For audio I am using the stereo audio input jack on the PVR-250. I am using a connector that accepts two RCA jacks (left audio and right audio) and then combines it into a stereo jack.

Hopefully someone can help me figure out this problem.

- John
Author:  JoJa15 [ Sun Jun 20, 2004 1:15 pm ]
Post subject: 
One other thing I forgot to ask. Is there anyway to verify that the new recompiled msp3400.o is being loaded? Is there anything I can do to check and make sure I have the right version now?

- John
Author:  LinHiNun [ Sun Jun 20, 2004 2:36 pm ]
Post subject: 
After much flailing, I am in the exact same state.
I have a PVR 350 and an nForce chip set in the MSI mega 180.
saved videos and mp3 play _perfectly_
watching live TV and recorded shows are silent.
I've tried everything JoJa15 has done, plus the instructions I found here (tries to get all sound out of SPDIF connector)

NOTHING WORKED!!!!

A few questions:

Where can I find the "aplay -l" utility that HOWTO describes.
Where does the .asoundrc file go?
Is the .asoundrc file really necessary.

HAS ANYBODY gotten Myth to _FULLY_ work on a MSI mega 180??

Thanks, and sorry if I sound a little short, I've reall sunk a lot of time into this and I feel like nothing I've tried has done a thing to improve things.

-- Ry
Author:  Xsecrets [ Sun Jun 20, 2004 5:57 pm ]
Post subject: 
well I seriously doubt that it is the motherboard that is the problem. you said you get sound from videos, so that sounds like the sound is working fine. The problem is that you are trying to use pvr350 tvout which is very new in linux and still under heavy development, and just recently got reports from a very few people that they actually got mpeg4 working ok. Then to top it off you try to run spdif, which is also a bit more difficult to configure. I'm not saying that any of this can't be done, but those types of configurations with all the latest bells and whistles, are going to be more difficult under linux, because the hardware vendors don't write the drivers for linux, and the community has to reverse engineer them which takes time and alot of trial and error and partial working etc.
Author:  JoJa15 [ Sun Jun 20, 2004 10:27 pm ]
Post subject: 
OK, in my attempt to try and figure this out I hooked my satellite up to my PVR-250. Instead of piping my PS2 video into the composite and the audio into the stereo headphone jack on the PVR-250 I am now running a COAX cable from the "Out to TV" port on my RCA DirectTV receiver to the COAX input on the PVR-250. I tune the station to channel 4 and I can see my cable feed. The only problem is still no sound!!!! :-(

I have verified that I can hear sound out for MP3's so I know sound out is working.

I then tried the following:

Mplayer /dev/video0

Sure enough a window fires up with the video from my Satellite. Interestingly in the output when Mplayr is starting up I saw the following:

Code:
MPEG: No audio stream found -> no sound


and later on down

Code:
Audio: no sound


Any ideas? Does that give anyone any clues that might help me resolve this problem? It is so frustrating to get this close to finishing the PVR but having no sound. :-)

Also what command would I use to find all the msp3400.o files on my system? I am wondering if one may be getting loaded that is no the recompiled one. I know it is a GREP command but I am a super linux novice.

Thanks,
John
Author:  cesman [ Sun Jun 20, 2004 11:27 pm ]
Post subject: 
Code:
locate msp3400.o

As root
Code:
updatedb
first.
Author:  LinHiNun [ Sun Jun 20, 2004 11:42 pm ]
Post subject:  SOLVED
I GOT MINE WORKING!!!!

see:

http://mysettopbox.tv/phpBB2/viewtopic.php?t=1777
Author:  JoJa15 [ Tue Jun 22, 2004 7:43 am ]
Post subject: 
I got mine working but it was not the method that you mentioned. I could not find a turn off HW XvMC. It is probably becuase I have a PVR-250 instead of a PVR-350?

What I did was a completely new fresh install and this time I did not run the install-i686-x which installs XvMC support. Later tonight I am going to try a fresh install with XvMC support again and see if that kills the sound. I am not sure why it kills sound but that is my suspect right now.

- John
Author:  LinHiNun [ Tue Jun 22, 2004 9:44 am ]
Post subject: 
That setting is not in the "setup" utility (I think called "myth-setup" in knoppmyth)

It's from the front end. Go to the setup icon -> tv -> playback

I think it's in the second or third screen ? and it's a checkbox towards the bottom of the screen.
Author:  JoJa15 [ Wed Jun 23, 2004 7:35 am ]
Post subject: 
That is where I went but I never saw the checkbox. Trust me I looked very carefully several times because I wanted to fix my sound in. Only after carefully looking at each page several times I decided to try a fresh install.

- John
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