[mythtv-users] remote frontend audio problem

Daryl Williams daryl at weblane.com
Fri Dec 2 13:12:21 EST 2005

folks, i am having a difficult time getting the audio to work on my 
remote (diskless) frontend.
i believe i have alsa working correctly, as alsaplayer will play just 
fine. if i set the audio output
device to "ALSA:default" and the mixer device to "default"  i get the 
message: "Unable to set ALSA parameters"
on the screen and mythfrontend reports:

2005-12-02 09:50:45.098 Using protocol version 15
2005-12-02 09:50:45.845 Killing AudioOutputDSP
2005-12-02 09:50:45.847 Opening audio device 'default'.
2005-12-02 09:50:45.865 in SetParameters(format=2, channels=2, 
rate=32000, buffer_time=500000, period_time=125000)
2005-12-02 09:50:45.866 Unable to set buffer time 500000 for playback: 
Invalid argument
2005-12-02 09:50:45.866 Unable to set ALSA parameters

if i set the audio output device to /dev/dsp and the mixer device to 
/dev/mixer, and try to watch tv, i get no sound
but the speakers on the tv will click once and mythfrontend reports the 

2005-12-02 09:54:36.285 Using protocol version 15
2005-12-02 09:54:37.141 Killing AudioOutputDSP
2005-12-02 09:54:37.143 Opening audio device '/dev/dsp'.
2005-12-02 09:54:37.144 Opening OSS audio device '/dev/dsp'.
2005-12-02 09:54:37.162 Audio fragment size: 4096
2005-12-02 09:54:37.164 Audio Stretch Factor: 1
2005-12-02 09:54:37.165 Ending reconfigure
2005-12-02 09:54:37.166 kickoffOutputAudioLoop: pid = 5496
2005-12-02 09:54:37.167 OutputAudioLoop: Play Event
2005-12-02 09:54:37.167 Broadcasting free space avail
2005-12-02 09:54:37.213 Using XV port 122
2005-12-02 09:54:37.216 Broadcasting free space avail
2005-12-02 09:54:37.224 Broadcasting free space avail

and then keeps repeating the "free space avail" message over and over 

i am running my own build of the 0.18.1 tarball on debian sarge using a kernel i also built myself.
the sound drivers are compiled in as modules rather than into the 
kernel, as i read somewhere that might
makes a difference. i have alsa oss emulation tuned on but not oss 
itself. an lsmod shows the following:

Module                  Size  Used by
nvidia               3706952  12
snd_au8830             61088  1
snd_ac97_codec         75392  1 snd_au8830
snd_pcm_oss            59808  0
snd_mixer_oss          19968  1 snd_pcm_oss
snd_pcm                95240  3 snd_au8830,snd_ac97_codec,snd_pcm_oss
snd_timer              24068  1 snd_pcm
snd_page_alloc          8324  1 snd_pcm
snd_mpu401_uart         7040  1 snd_au8830
snd_rawmidi            22176  1 snd_mpu401_uart
snd_seq_device          7564  1 snd_rawmidi
snd                    56964  11 

i have read as much documentation (both mythtv and alsa) as i can find, 
and have been troubleshooting
this for days now. any help from the group would be very much 
appreciated. i am new to the group
but have been playing with mythtv for a few months now. i also want to 
express my appreciation for
mythtv to everyone that contributes to it. it is simply a wonderful 
suite of programs.

thanks and best regards,


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