[mythtv] Separating CAPTUR and Capture in OSS

Dwight Hubbard dhubbard at dwightandamy.com
Wed Mar 5 09:28:19 EST 2003


That modules.conf has the alsa sb-live driver loaded (snd-emu10k1) and the
alsa oss modules.  Not the oss drivers.  The OSS sblive driver is called
emu10k1.

> FWIW, I have an SBLive using oss and it works fine for me.  BTW, since
> you are using a Haupauge, why not try btaudio.  But anyway...
>
> I am running Mandrake 9.0 and according to my modules.conf, I am not
> loading alsa.  I use kmix to mute line in and set it to capture. I use
> the iGain to adjust the capture volume;  because of the ringbuffer it
> takes a couple seconds to hear the adjustment.  Here is my modules.conf
> (generated by Mandrake install):
>
> probeall scsi_hostadapter ide-scsi
> alias sound-slot-1 snd-emu10k1
> alias eth0 3c59x
> above snd-emu10k1 snd-pcm-oss
> alias sound-slot-0 es1371
> probeall usb-interface usb-uhci
> alias /dev/nvidia*   nvidia
>
> Larry
>
>> Tom Panning wrote:
>>> When I try to watch live TV with MythTV, I hear both the sound for
>>> the live  feed (what Myth is recording) and what's being played from
>>> the buffer. Here's  what I'm using:
>>> * SB Live sound card (with OSS sound drivers)
>>> * Hauppage WinTV card
>>> * CVS version (today) of MythTv
>>> * Debian unstable
>>>
>>> I know that the Faq and the How-to mention this problem, but in both
>>> documents  the solution appears to be specific to alsa drivers. I
>>> understand what has to  be done with the mixer in order to get it to
>>> work, but I can't seem mute the  "CAPTUR source" without muting the
>>> "Capture mixer" (as they are referred to  in section 17.11 of the
>>> HOWTO).
>>>
>>> After futzing with the mixer quite a bit, here's what I've been able
>>> to  discover:
>>> 1) There are 13 mixer controls: Volume, Pcm, Speaker, Line*,
>>> Microphone*, CD*,  IGain*, OGain, Line1*, Digital1, PhoneIn*,
>>> PhoneOut, and Video*. (an asterisk  (*) means that I can record this
>>> channel)
>>
>> I believe IGain (or possibly OGain) is the equivalent of ALSA's
>> "Capture" to control to level going into the DSP. For OSS, you
>> can do the same kind of test from section 17.11 by subsitiuting
>> "sox" for "aplay" and your favorite mixer in place of "alsamixer".
>> "man sox" to determine the options it will need.
>>
>>> 2) When I listen to mp3's using xmms, all of the controls can be
>>> muted except  for Pcm and OGain; I can set any channel to be the
>>> recording channel and it  does not affect playback. Moving the volume
>>> control in xmms moves the Pcm  slider. (I have no idea why I can
>>> muting the Volume control has no effect).
>>
>> Since this is an SB Live!, is it possible you are going out
>> through an output other than line-out/speaker?
>>
>>> 3) When I use xawtv, all of the controls can be muted except for
>>> IGain and  OGain; Line must be set to record (but the mute and volume
>>> setting have no  effect).
>>>
>>> 4) In MythTV, if I use the xawtv settings (see #3), then I hear the
>>> live feed  and not the playback. If I unmute the Pcm control, then I
>>> hear both the live  feed and the playback. If I then mute the IGain
>>> control (or turn it's volume  down to zero) then I hear just the
>>> playback for a few seconds until I hit the  point where IGain was
>>> muted, and then there is no sound.
>>
>> If it turns out that you really can't mute the analog audio
>> passthru and still record with the DSP, then you may want to
>> try ALSA. I use a SB Live! with ALSA for MythTV and both the
>> speaker out and the digital out to a reciever work perfectly.
>>
>> --  bjm
>>
>>
>>
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>
>
>
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