Hello to all,
I've been fighting with mythtv for last couple of days with no success. Tried
all and everything, including googling, forums, list archives etc. Now I am
totally frustrated with mythtv and start thinking if mythtv is just a myth
and nothing else. So this is the last attempt before I give up - asking the
mailing list people.
What do I have:
Athlon XP 2500+ 512 MB RAM (it is an MSI barebone called MEGA 180);
Motherboard is nForce2 with onboard GeForce4 MX - nForce GPU;
Sound is onboard nForce2 Soundstorm device;
Pinnacle PCTV (BT878) TV capture board, audio-out comes into sound cards'
Line-In jack;
OS: freshly installed and recompiled Gentoo system, linux kernel 2.6.13-r3
MythTV: emerged and compiled MythTV ver. 0.18.1
Now to the problem itself. It is quite popular, as far as I discovered while
digging through archives.
I have MythTV compiled and installed successfully, all the modules work just
fine EXCEPT the Live TV itself. TV tuner board is working OK with xawtv, xdtv
etc, but when I go to watching TV in Myth, the 1 second sound cycles for a
while and the picture freezes every 5-10 seconds. Sometimes I even get the
mythbackend crashed if it is run as a daemon.
Changing different sound drivers and different sound systems gives almost the
same results, differs only amount of errors mythfrontend produces but not the
errors itself. Playing with different options in myth configuration
(including sound buffers, sound device, capture resolutions, sampling rates
etc) gives no result.
I have tried 4 different sound modes:
1) Original NVIDIA sound driver nvsound (it is OSS mode only driver).
MythTV device settings - /dev/dsp and /dev/mixer;
mythfrontend errors:
2005-11-03 12:30:13.347 Opening audio device '/dev/dsp'.
2005-11-03 12:30:13.347 Opening OSS audio device '/dev/dsp'.
2005-11-03 12:30:13.418 Using XV port 105
2005-11-03 12:30:14.148 Changing from None to WatchingLiveTV
2005-11-03 12:30:14.196 Audio buffer overflow, audio data lost!
2005-11-03 12:30:14.197 Audio buffer overflow, audio data lost!
2005-11-03 12:30:14.197 Audio buffer overflow, audio data lost!
and the last error goes for a while.
mythbackend errors:
2005-11-03 12:30:14.206 NVR: Ran out of free AUDIO buffers :-(
2005-11-03 12:30:14.207 NVR: Ran out of free AUDIO buffers :-(
2005-11-03 12:30:14.207 NVR: Ran out of free AUDIO buffers :-(
and also for a while.
2) Now the ALSA drivers:
snd_pcm_oss, snd_mixer_oss, snd_seq_oss, snd_seq_midi_event, snd_seq,
snd_seq_device, snd_intel8x0, snd_ac97_codec, snd_pcm, snd_timer, snd,
snd_page_alloc.
2a) Running in OSS mode, MythTV device settings - /dev/dsp and /dev/mixer;
mythfrontend errors:
2005-11-03 12:40:41.670 Opening audio device '/dev/dsp'.
2005-11-03 12:40:41.670 Opening OSS audio device '/dev/dsp'.
2005-11-03 12:40:41.690 Using XV port 105
2005-11-03 12:40:42.100 Changing from None to WatchingLiveTV
2005-11-03 12:40:42.107 Realtime priority would require SUID as root.
2005-11-03 12:40:42.461 Video timing method: SGI OpenGL
2005-11-03 12:40:48.840 prebuffering pause
2005-11-03 12:40:56.153 prebuffering pause
2005-11-03 12:41:01.139 prebuffering pause
2005-11-03 12:41:06.825 prebuffering pause
2005-11-03 12:41:12.302 prebuffering pause
2005-11-03 12:41:13.206 Audio buffer overflow, audio data lost!
2005-11-03 12:41:13.207 Audio buffer overflow, audio data lost!
2005-11-03 12:41:13.207 Audio buffer overflow, audio data lost!
2005-11-03 12:41:13.211 Audio buffer overflow, audio data lost!
2005-11-03 12:41:13.212 Audio buffer overflow, audio data lost!
etc.
mythbackend errors:
2005-11-03 12:40:40.643 Changing from None to WatchingLiveTV
strange error flushing buffer ...
2b) ALSA default mode, MythTV device settings - ALSA:default and mixer
default;
mythfrontend errors:
2005-11-03 12:44:44.107 Changing from None to WatchingLiveTV
2005-11-03 12:44:44.328 Video timing method: SGI OpenGL
2005-11-03 12:44:49.017 prebuffering pause
2005-11-03 12:44:49.423 WriteAudio: buffer underrun
2005-11-03 12:44:55.949 prebuffering pause
2005-11-03 12:44:56.340 WriteAudio: buffer underrun
2005-11-03 12:45:00.572 prebuffering pause
2005-11-03 12:45:01.072 WriteAudio: buffer underrun
2005-11-03 12:45:05.805 prebuffering pause
2005-11-03 12:45:06.188 WriteAudio: buffer underrun
2005-11-03 12:45:10.746 prebuffering pause
2005-11-03 12:45:11.180 WriteAudio: buffer underrun
2005-11-03 12:45:11.558 Audio buffer overflow, audio data lost!
2005-11-03 12:45:11.562 Audio buffer overflow, audio data lost!
2005-11-03 12:45:11.563 Audio buffer overflow, audio data lost!
2005-11-03 12:45:11.563 Audio buffer overflow, audio data lost!
2005-11-03 12:45:11.567 Audio buffer overflow, audio data lost!
etc.
mythbackend errors:
2005-11-03 12:44:42.626 Changing from None to WatchingLiveTV
strange error flushing buffer ...
2c) ALSA mode with patched .asaundrc file (added dmix and rate):
pcm.nforce-hw {
type hw
card 0
}
pcm.!default {
type plug
slave.pcm nforce
}
pcm.nforce {
type dmix
