[mythtv-users] Yet another sound problem
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?
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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