[mythtv-users] Yet another sound problem

David Wadler david at davidwadler.com
Thu Jul 8 17:15:23 EDT 2004

A few months ago, I set up Myth on my machine (2.4.x kernel on Gentoo) and had lots of issues with sound.  Ultimately, I fixed it by loading the tvmixer module.  I don't know why that fixed it, but as soon as I loaded the module and restarted mythfrontend, everything sounded good.

I had to wipe my drive (don't ask) and am now running a 2.6.6 kernel.  The new kernel made it very easy to get ALSA up-and-running and I'm using it in Xine, mplayer, XMMS, and other apps.  However, when I set Myth to use ALSA:default, I got choppy video (lots of prebuffering messages) and audio that wasn't quite right.  It sounds clipped.  I played with the mixer levels, and no matter how low I go, there remains distortion.  I switched to /dev/dsp and /dev/adsp, both of which work, but both of which have the same audio distortion.  In addition to adjusting the levels with my soundcard, I also tried to adjust the TV-Card's mixer, by doing alsamixer -c 1.  I can only adjust the level attached to "Capture" and changing it doesn't have any effect.

ALSA gives me great sound in my other apps and I'm fairly confident that I have it set up correctly.  I don't know what I'm missing in Myth.  I'd be okay with using OSS with Myth, provided I can get clean sound.  Any ideas?

Loaded modules:

Module                  Size  Used by
snd_pcm_oss            48932  2
snd_mixer_oss          17344  1 snd_pcm_oss
tvmixer                 4720  1
snd_bt87x              11204  0
tuner                  17356  0
tvaudio                20428  0
tda7432                 6924  0
bttv                  143980  2
video_buf              16516  1 bttv
i2c_algo_bit            8904  1 bttv
btcx_risc               3848  1 bttv
i2c_core               18756  6 tvmixer,tuner,tvaudio,tda7432,bttv,i2c_algo_bit
snd_via82xx            22208  2
snd_pcm                84580  3 snd_pcm_oss,snd_bt87x,snd_via82xx
snd_timer              20996  1 snd_pcm
snd_ac97_codec         61444  1 snd_via82xx
snd_page_alloc          8964  3 snd_bt87x,snd_via82xx,snd_pcm
snd_mpu401_uart         6144  1 snd_via82xx
snd_rawmidi            20128  1 snd_mpu401_uart
snd_seq_device          6536  1 snd_rawmidi
snd                    46564  10 snd_pcm_oss,snd_mixer_oss,snd_bt87x,snd_via82xx,snd_pcm,snd_timer,snd_ac97_codec,snd_mpu401_uart,snd_rawmidi,snd_seq_device

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