Mailing List Archive

Nick,

Did you point the set-up to /dev/dsp1?

Something doesn't seem right here, I think it should look like this

/dev/dsp >> Regular Sound Card
/dev/dsp0 >> btaudio digital (this is the one you want)
/dev/dsp1 >> btaudio analog (this doesn't work for btaudio recording
IIRC)

try:

# dmesg | grep btaudio

should tell you what device numbers are assigned to btaudio.

-Eric

On Saturday, July 26, 2003, at 02:20 PM, NICHOLAS ALLEN HALL wrote:

> Hi,
>
> I'm trying to get MythTV 0.10 to work with btaudio. It works with the
> line out port but there is an annoying hum that seems to be a physical
> problem so I thought it would be worthwhile to get btaudio to work.
>
> My TV tuner card is a Haupaugge WinTV (BT878) card. I'm using OSS (not
> Alsa) - although I could install Alsa if it would help. I know btaudio
> works on this card because if I do:
>
> sox -r 32000 -c 2 -t ossdsp /dev/dsp1 -r 48000 -t offdsp /dev/dsp
>
> then the sound comes out the speakers just fine (the rate parameters
> don't seem to matter except to eliminate the sox warnings).
>
> Per what I could find on the mailing list, I tried adding to
> /etc/modules.conf:
>
> options btaudio debug=2 digital=1 analog=0 rate=32000
>
> and when I either watch TV in MythTV or run sox I get in my
> /var/log/messages each time:
>
> btaudio: open digital dsp[19]
>
> I changed MythTV's settings to use /dev/dsp1 and then go to watch TV
> but there is no sound and the video also seems like its in slow motion
> (like maybe 3x slower than normal). If I use /dev/dsp and have the
> sound coming through the line-in jack it works fine (although the
> sound has the whine).
>
> Does anyone have any pointers or suggestions? I'd gladly debug if
> someone pointed me to the right place. Thanks for any help,
>
> Nick
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users@snowman.net
> http://lists.snowman.net/cgi-bin/mailman/listinfo/mythtv-users

Yes, the MythTV setup is pointed to /dev/dsp1. If I run dmesg | grep btaudio I get:

btaudio: driver version 0.7 loaded [digital]
btaudio: Bt878 (rev 2) at 01:06.1. irq:4, latency: 32, mnio: 0xde001000
btaudio: using card config "default"
btaudio: registered device dsp1 [digital]

So it seems btaudio is using dsp1 just fine.

When I run mythfrontend, I get on the console (after I go to Watch TV):

Changing from None to WatchingLiveTV
Opening OSS audio device '/dev/dsp1'.
audio device cannot report buffer state accurately.
audio/video sync will be bad, continuing anyway

I'm not sure if these MythTV warnings are an artifact of the sound not working correctly or have something to do with the cause.

BTW, I'm running RedHat 9 - kernel 2.4.20-8

Thanks for any help,

Nick


> Nick,
>
>Did you point the set-up to /dev/dsp1?
>
>Something doesn't seem right here, I think it should look like this
>
>/dev/dsp >> Regular Sound Card
>/dev/dsp0 >> btaudio digital (this is the one you >want)
>/dev/dsp1 >> btaudio analog (this doesn't work for >btaudio recording
>IIRC)
>
>try:
>
># dmesg | grep btaudio
>
>should tell you what device numbers are assigned to >btaudio.
>
>-Eric
>
>On Saturday, July 26, 2003, at 02:20 PM, NICHOLAS >ALLEN HALL wrote:
>
>> Hi,
>>
>> I'm trying to get MythTV 0.10 to work with btaudio. It works with the
>> line out port but there is an annoying hum that seems to be a physical
>> problem so I thought it would be worthwhile to get btaudio to work.
>>
>> My TV tuner card is a Haupaugge WinTV (BT878) card. I'm using OSS (not
>> Alsa) - although I could install Alsa if it would help. I know btaudio
>> works on this card because if I do:
>>
>> sox -r 32000 -c 2 -t ossdsp /dev/dsp1 -r 48000 -t offdsp /dev/dsp
>>
>> then the sound comes out the speakers just fine (the rate parameters
>> don't seem to matter except to eliminate the sox warnings).
>>
>> Per what I could find on the mailing list, I tried adding to
>> /etc/modules.conf:
>>
>> options btaudio debug=2 digital=1 analog=0 rate=32000
>>
>> and when I either watch TV in MythTV or run sox I get in my
>> /var/log/messages each time:
>>
>> btaudio: open digital dsp[19]
>>
>> I changed MythTV's settings to use /dev/dsp1 and then go to watch TV
>> but there is no sound and the video also seems like its in slow motion
>> (like maybe 3x slower than normal). If I use /dev/dsp and have the
>> sound coming through the line-in jack it works fine (although the
>> sound has the whine).
>>
>> Does anyone have any pointers or suggestions? I'd gladly debug if
>> someone pointed me to the right place. Thanks for any help,
>>
>> Nick

>>>>> On Sat, 26 Jul 2003 19:49:22 -0500, NICHOLAS ALLEN HALL <nhall@students.wisc.edu> said:

n> Yes, the MythTV setup is pointed to /dev/dsp1. If I run dmesg | grep btaudio I get:
n> btaudio: driver version 0.7 loaded [digital]
n> btaudio: Bt878 (rev 2) at 01:06.1. irq:4, latency: 32, mnio: 0xde001000
n> btaudio: using card config "default"
n> btaudio: registered device dsp1 [digital]

n> So it seems btaudio is using dsp1 just fine.

n> When I run mythfrontend, I get on the console (after I go to Watch TV):

n> Changing from None to WatchingLiveTV
n> Opening OSS audio device '/dev/dsp1'.
n> audio device cannot report buffer state accurately.
n> audio/video sync will be bad, continuing anyway

The btaudio device is for input only. Your frontend audio
output device needs to be /dev/dsp. (Set this in the mythfrontend
Setup->General menu.)

Also, you probably need to set the backend input device
sampling rate limit to 32000. This is in the "setup" program's
Capture cards menu (use the left/right arrow keys).
--
Gregorio Gervasio, Jr.
gtgj@pacbell.net

Did you actually check what dsp btaudio picks up?

ie

cat /var/log/messages | grep dsp

You should see something like this

Jul 25 17:34:55 marcus kernel: btaudio: registered device dsp2 [digital]
Jul 25 17:34:55 marcus kernel: btaudio: registered device dsp3 [analog]

Set Myth to use the digital dsp (applies for the ATI TV Wonder)

On 26 Jul 2003 at 13:20, NICHOLAS ALLEN HALL wrote:

> I changed MythTV's settings to use /dev/dsp1 and then go to watch TV but there
> is no sound and the video also seems like its in slow motion (like maybe 3x
> slower than normal). If I use /dev/dsp and have the sound coming through the
> line-in jack it works fine (although the sound has the whine).
>
> Does anyone have any pointers or suggestions? I'd gladly debug if someone
> pointed me to the right place. Thanks for any help,


--
Harondel J. Sibble
Sibble Computer Consulting
Creating solutions for the small business and home computer user.
help@pdscc.com (use pgp keyid 0x3AD5C11D) http://www.pdscc.com
(604) 739-3709 (voice/fax) (604) 686-2253 (pager)

On Saturday 26 July 2003 20:49, NICHOLAS ALLEN HALL wrote:
> Yes, the MythTV setup is pointed to /dev/dsp1. If I run dmesg | grep
> btaudio I get:
>
> btaudio: driver version 0.7 loaded [digital]
> btaudio: Bt878 (rev 2) at 01:06.1. irq:4, latency: 32, mnio: 0xde001000
> btaudio: using card config "default"
> btaudio: registered device dsp1 [digital]
>
> So it seems btaudio is using dsp1 just fine.
>
> When I run mythfrontend, I get on the console (after I go to Watch TV):
>
> Changing from None to WatchingLiveTV
> Opening OSS audio device '/dev/dsp1'.
> audio device cannot report buffer state accurately.
> audio/video sync will be bad, continuing anyway
>
> I'm not sure if these MythTV warnings are an artifact of the sound not
> working correctly or have something to do with the cause.

Are you sure you're configuring Myth properly to use /dev/dsp1? The place
where you would do that is in the backend setup where you define your tuner
card, you assign it an audio capture device, which you should set to
/dev/dsp1. There is a different setting in the frontend setup that defines
the audio *output* device. That one should remain /dev/dsp (as you don't
want it to try to output to your btaudio device!).

-JAC
_______________________________________________
mythtv-users mailing list
mythtv-users@snowman.net
http://lists.snowman.net/cgi-bin/mailman/listinfo/mythtv-users

Thanks for the help everyone. I feel stupid but at least got btaudio to function by changing the capture card to use /dev/dsp1 (my digital capture device) as suggested by several people. Now I have a related problem however:

When I go to watch TV, the audio comes out high-pitched, like a chipmunk. Now, I've searched the MythTV mailing list trying to figure out how to fix this and have tried everything previously posted but have not gotten it working yet. I realize it has something to do with the sampling rate. This is how I have it set up:

In MythTV's "setup" program, in the capture card setting underneath where I set /dev/dsp1, I have Audio sampling rate limit set to 32000, which I believe should be what my capture card returns audio at. I've also checked the mythconverg database and that value is in there properly. I've tried changing this but all settings result in a high pitch (although higher ones seem to make the audio even higher pitched).

In the mythfrontend TV recording setup, the sampling rate is set to 32000. I've tried changing it to other settings but they do not help.

In modules.conf I've added the line:

options btaudio debug=2 digital=1 analog=0 rate=32000

to force btaudio to that rate. If I change the rate I can seem to get the audio to go --higher-- but cannot get it to approach the proper pitch.

Does anyone have any further suggestions? Thanks again for any help,

Nick


----- Original Message -----
From: "Joseph A. Caputo" <jcaputo1@comcast.net>
Date: Sunday, July 27, 2003 9:26 am
Subject: Re: [mythtv-users] Re:btaudio works under sox but not MythTV

> On Saturday 26 July 2003 20:49, NICHOLAS ALLEN HALL wrote:
> > Yes, the MythTV setup is pointed to /dev/dsp1. If I run dmesg | grep
> > btaudio I get:
> >
> > btaudio: driver version 0.7 loaded [digital]
> > btaudio: Bt878 (rev 2) at 01:06.1. irq:4, latency: 32, mnio:
> 0xde001000> btaudio: using card config "default"
> > btaudio: registered device dsp1 [digital]
> >
> > So it seems btaudio is using dsp1 just fine.
> >
> > When I run mythfrontend, I get on the console (after I go to
> Watch TV):
> >
> > Changing from None to WatchingLiveTV
> > Opening OSS audio device '/dev/dsp1'.
> > audio device cannot report buffer state accurately.
> > audio/video sync will be bad, continuing anyway
> >
> > I'm not sure if these MythTV warnings are an artifact of the
> sound not
> > working correctly or have something to do with the cause.
>
> Are you sure you're configuring Myth properly to use /dev/dsp1?
> The place
> where you would do that is in the backend setup where you define
> your tuner
> card, you assign it an audio capture device, which you should set
> to
> /dev/dsp1. There is a different setting in the frontend setup
> that defines
> the audio *output* device. That one should remain /dev/dsp (as
> you don't
> want it to try to output to your btaudio device!).
>
> -JAC
>

> -----Original Message-----
> From: mythtv-users-bounces@snowman.net
> [mailto:mythtv-users-bounces@snowman.net]On Behalf Of NICHOLAS ALLEN
> HALL
> Sent: Sunday, July 27, 2003 3:18 PM
> To: mythtv-users@snowman.net
> Subject: Re: [mythtv-users] Re:btaudio works under sox but not MythTV
>
>
> Thanks for the help everyone. I feel stupid but at least got
> btaudio to function by changing the capture card to use /dev/dsp1
> (my digital capture device) as suggested by several people. Now I
> have a related problem however:
>
> When I go to watch TV, the audio comes out high-pitched, like a
> chipmunk. Now, I've searched the MythTV mailing list trying to
> figure out how to fix this and have tried everything previously
> posted but have not gotten it working yet. I realize it has
> something to do with the sampling rate. This is how I have it set up:
>
> In MythTV's "setup" program, in the capture card setting
> underneath where I set /dev/dsp1, I have Audio sampling rate
> limit set to 32000, which I believe should be what my capture
> card returns audio at. I've also checked the mythconverg database
> and that value is in there properly. I've tried changing this but
> all settings result in a high pitch (although higher ones seem to
> make the audio even higher pitched).
>
> In the mythfrontend TV recording setup, the sampling rate is set
> to 32000. I've tried changing it to other settings but they do not help.
>

Did you change the sampling rate for both the 'Default' and 'LiveTV'
recording profiles?

-JAC

----- Original Message -----
From: "Joseph A. Caputo" <jcaputo1@comcast.net>
Date: Monday, July 28, 2003 12:12 pm
Subject: RE: [mythtv-users] Re:btaudio works under sox but not MythTV

> > -----Original Message-----
> > From: mythtv-users-bounces@snowman.net
> > [mythtv-users-bounces@snowman.net]On Behalf Of NICHOLAS ALLEN
> > HALL
> > Sent: Sunday, July 27, 2003 3:18 PM
> > To: mythtv-users@snowman.net
> > Subject: Re: [mythtv-users] Re:btaudio works under sox but not
> MythTV>
> >
> > Thanks for the help everyone. I feel stupid but at least got
> > btaudio to function by changing the capture card to use /dev/dsp1
> > (my digital capture device) as suggested by several people. Now I
> > have a related problem however:
> >
> > When I go to watch TV, the audio comes out high-pitched, like a
> > chipmunk. Now, I've searched the MythTV mailing list trying to
> > figure out how to fix this and have tried everything previously
> > posted but have not gotten it working yet. I realize it has
> > something to do with the sampling rate. This is how I have it
> set up:
> >
> > In MythTV's "setup" program, in the capture card setting
> > underneath where I set /dev/dsp1, I have Audio sampling rate
> > limit set to 32000, which I believe should be what my capture
> > card returns audio at. I've also checked the mythconverg database
> > and that value is in there properly. I've tried changing this but
> > all settings result in a high pitch (although higher ones seem to
> > make the audio even higher pitched).
> >
> > In the mythfrontend TV recording setup, the sampling rate is set
> > to 32000. I've tried changing it to other settings but they do
> not help.
> >
>
> Did you change the sampling rate for both the 'Default' and 'LiveTV'
> recording profiles?
>
> -JAC
>
>


Thanks for replying. Yes, I changed the sampling rate to 32000 for both the Default and LiveTV recording profiles. Even though it says on that screen that 32000 is recommended for btaudio, I did also try changing them both to 48000 after I was unable to get the sound to the normal pitch at 32000 but it did not help - no matter what they are set to the high-pitch chipmunk sound still remains.

One note that may or not be significant is that when I'm watching live tv, the video is the normal speed but since the sound seems about 2 times faster, the sound pauses every couple seconds to let the video catch up (I think this seems obvious). However, if I record a program, the sound is still the same speed/pitch but the audio is also speeded up and stays in sync with the video. I used MythTV to do a 1 minute "manual recording" and then played back the video it recorded and it took 38 seconds to play the video so it turns out that the video plays at about 1.6x normal speed.

I was curious what would happen if I changed the mythfrontend Record options for "Default" and "LiveTV" to 48000 kHz and the video still recorded so it played in 38 seconds, with no apparent difference. I've also tried changing the "setup" settings for the capture card to have a sampling rate limit of "none" and also tried "48000" (in addition to the 32000 it apparently should be) and all of those settings always result in a recording of 38 seconds long, so it doesn't seem like any of those settings are actually doing anything. I've checked the "capturecard" table in the mythconverg to confirm that the setup program is definitely putting the values in there.

Does anyone have any suggestions of where to look next? Thanks for any help,

Nick

> -----Original Message-----
> From: mythtv-users-bounces@snowman.net
> [mailto:mythtv-users-bounces@snowman.net]On Behalf Of NICHOLAS ALLEN
> HALL
> Sent: Thursday, July 31, 2003 5:00 PM
> To: mythtv-users@snowman.net
> Subject: Re: RE: [mythtv-users] Re:btaudio works under sox but not
> MythTV
>
>
> Thanks for replying. Yes, I changed the sampling rate to 32000
> for both the Default and LiveTV recording profiles. Even though
> it says on that screen that 32000 is recommended for btaudio, I
> did also try changing them both to 48000 after I was unable to
> get the sound to the normal pitch at 32000 but it did not help -
> no matter what they are set to the high-pitch chipmunk sound
> still remains.
>
> One note that may or not be significant is that when I'm watching
> live tv, the video is the normal speed but since the sound seems
> about 2 times faster, the sound pauses every couple seconds to
> let the video catch up (I think this seems obvious). However, if
> I record a program, the sound is still the same speed/pitch but
> the audio is also speeded up and stays in sync with the video. I
> used MythTV to do a 1 minute "manual recording" and then played
> back the video it recorded and it took 38 seconds to play the
> video so it turns out that the video plays at about 1.6x normal speed.
>
> I was curious what would happen if I changed the mythfrontend
> Record options for "Default" and "LiveTV" to 48000 kHz and the
> video still recorded so it played in 38 seconds, with no apparent
> difference. I've also tried changing the "setup" settings for the
> capture card to have a sampling rate limit of "none" and also
> tried "48000" (in addition to the 32000 it apparently should be)
> and all of those settings always result in a recording of 38
> seconds long, so it doesn't seem like any of those settings are
> actually doing anything. I've checked the "capturecard" table in
> the mythconverg to confirm that the setup program is definitely
> putting the values in there.
>
> Does anyone have any suggestions of where to look next? Thanks
> for any help,
>
> Nick


The problem might be your (output) sound card. You may very well be
recording at 32000 Hz, but your sound card may not be able to *play* 32000
Hz, so everything gets played at 44100 or 48000 Hz. Do you have another
sound card or another computer you can try playing your recordings on?

-JAC

----- Original Message -----
From: "Joseph A. Caputo" <jcaputo1@comcast.net>
Date: Friday, August 1, 2003 10:27 am
Subject: RE: RE: [mythtv-users] Re:btaudio works under sox but not MythTV

> > -----Original Message-----
> > From: mythtv-users-bounces@snowman.net
> > [mythtv-users-bounces@snowman.net]On Behalf Of NICHOLAS ALLEN
> > HALL
> > Sent: Thursday, July 31, 2003 5:00 PM
> > To: mythtv-users@snowman.net
> > Subject: Re: RE: [mythtv-users] Re:btaudio works under sox but not
> > MythTV
> >
> >
> > Thanks for replying. Yes, I changed the sampling rate to 32000
> > for both the Default and LiveTV recording profiles. Even though
> > it says on that screen that 32000 is recommended for btaudio, I
> > did also try changing them both to 48000 after I was unable to
> > get the sound to the normal pitch at 32000 but it did not help -
> > no matter what they are set to the high-pitch chipmunk sound
> > still remains.
> >
> > One note that may or not be significant is that when I'm watching
> > live tv, the video is the normal speed but since the sound seems
> > about 2 times faster, the sound pauses every couple seconds to
> > let the video catch up (I think this seems obvious). However, if
> > I record a program, the sound is still the same speed/pitch but
> > the audio is also speeded up and stays in sync with the video. I
> > used MythTV to do a 1 minute "manual recording" and then played
> > back the video it recorded and it took 38 seconds to play the
> > video so it turns out that the video plays at about 1.6x normal
> speed.>
> > I was curious what would happen if I changed the mythfrontend
> > Record options for "Default" and "LiveTV" to 48000 kHz and the
> > video still recorded so it played in 38 seconds, with no apparent
> > difference. I've also tried changing the "setup" settings for the
> > capture card to have a sampling rate limit of "none" and also
> > tried "48000" (in addition to the 32000 it apparently should be)
> > and all of those settings always result in a recording of 38
> > seconds long, so it doesn't seem like any of those settings are
> > actually doing anything. I've checked the "capturecard" table in
> > the mythconverg to confirm that the setup program is definitely
> > putting the values in there.
> >
> > Does anyone have any suggestions of where to look next? Thanks
> > for any help,
> >
> > Nick
>
>
> The problem might be your (output) sound card. You may very well be
> recording at 32000 Hz, but your sound card may not be able to
> *play* 32000
> Hz, so everything gets played at 44100 or 48000 Hz. Do you have
> anothersound card or another computer you can try playing your
> recordings on?
>
> -JAC
>

Hey, thanks a lot for all your help Joseph! I was thinking along the same lines last night when I tried out MythMusic and noticed that all the songs were playing a little fast and off pitch and figured that it was playing the 44.1 kHz at 48 kHz. I found an old Soundblaster Live laying around this morning and put it in and the audio was working just fine in only a few minutes. The sound I was using before was the onboard NForce2 chipset sound on my motherboard using the i810_audio module. Apparently sox must automatically resample the sound to bring it up to 48 kHz but Myth doesn't. I'm not sure if there's any way of getting Myth to resample in the same way or not. Anyway, its working now, so thanks a lot.

Nick

> -----Original Message-----
> From: mythtv-users-bounces@mythtv.org
> [mailto:mythtv-users-bounces@mythtv.org]On Behalf Of NICHOLAS ALLEN HALL
> Sent: Friday, August 01, 2003 2:27 PM
> To: mythtv-users@snowman.net
> Subject: Re: RE: RE: [mythtv-users] Re:btaudio works under sox but not
> MythTV
>
>
> Hey, thanks a lot for all your help Joseph! I was thinking along
> the same lines last night when I tried out MythMusic and noticed
> that all the songs were playing a little fast and off pitch and
> figured that it was playing the 44.1 kHz at 48 kHz. I found an
> old Soundblaster Live laying around this morning and put it in
> and the audio was working just fine in only a few minutes. The
> sound I was using before was the onboard NForce2 chipset sound on
> my motherboard using the i810_audio module. Apparently sox must
> automatically resample the sound to bring it up to 48 kHz but
> Myth doesn't. I'm not sure if there's any way of getting Myth to
> resample in the same way or not. Anyway, its working now, so thanks a lot.
>
> Nick


Check the list archives; I'm pretty sure this problem has been discussed
before, maybe someone has solved it. Glad to hear you've got something
working, though!

-JAC

Joseph A. Caputo wrote:

> The problem might be your (output) sound card. You may very well be
> recording at 32000 Hz, but your sound card may not be able to *play* 32000
> Hz, so everything gets played at 44100 or 48000 Hz. Do you have another
> sound card or another computer you can try playing your recordings on?

I just tackled a similar problem this weekend. My on-board audio device (via
82xx) only seems to be able to handle 44.1k and 48k. When playing back audio
recorded at 32k, the result from my receiver was at normal speed but just
"bad" somehow (dirty with odd bits of high noise).

Playing the output from the btaudio device (/dev/dsp1) to my alsa device
connected to my receiver (/dev/adsp0) with sox sounded just fine if I told sox
to resample the data it was sending to the alsa device to 44.1k or 48k:
sox -w -r 32000 -t ossdsp /dev/dsp1 -r 44100 -t ossdsp /dev/adsp0

So, if Myth had the ability to set the sampling rate of the source device
*and* the rate at which to record the data at, then I'd be able to use the
btaudio device. As it is, I'm capturing via line-in on my sound card.

--
__ ____
/ / / __/ Brian Lalor
/ _ \/__ \ blalor@bravo5.org
/_.__/____/ http://bravo5.org/