[mythtv-users] How to debug "no sound" ?
John P Poet
jppoet at gmail.com
Sun Jun 26 03:20:38 UTC 2005
I just did a fresh install of Fedora Core 4. Everything is working great,
except I get no sound out of Myth.
I had a similar problem when I first installed my maudio sound card under
FC2. All "other" programs would produce sound out the S/PDIF jack just fine,
but Myth was mute. I thought I had finally figured out what needed to go
into my asound.conf file, to make Myth happy. I have tried using that exact
same asound.conf file under FC4, but Myth is still silent.
What is weird, is that mplayer works with the S/PDIF out perfectly, even
when a asound.conf file does not exist. All I have to do is use "mplayer -ao
alsa -ac hwac3" and it just works.
Xine and aplay require the asound.conf file, however. For Xine and aplay,
this asound.conf file is sufficient:
With the above asound.conf, I can play both AC3 and stereo material via the
S/PDIF port using any program *except* Myth.
Under FC2, I thought I had solved the problem by adding:
ttable.0.8 1 # S/PDIF left...Delta 9
ttable.1.9 1 # S/PDIF right...Delta 10
And then telling Myth to use "ALSA:ice1712_spdif". However, that does not
seem to be working under FC4. I end up with this in my log:
2005-06-25 21:03:39.653 Using protocol version 17
adding pes stream at pid 0x31 with type 2
adding pes stream at pid 0x34 with type 129
2005-06-25 21:03:42.696 libavformat type mpegts
0: start_time: 4752.137 duration: 323.408
1: start_time: 4752.094 duration: 323.407
stream: start_time: 52801.048 duration: 3593.896 bitrate=15577 kb/s
2005-06-25 21:03:43.472 Stream #1 (audio track #0) is an audio stream with 2
2005-06-25 21:03:43.472 Auto-selecting AC3 audio track (stream #1).
2005-06-25 21:03:43.472 Initializing audio parms from audio track #0.
2005-06-25 21:03:43.603 Killing AudioOutputDSP
2005-06-25 21:03:43.604 Opening audio device 'ice1712_spdif'.
2005-06-25 21:03:43.612 in SetParameters(format=2, channels=2, rate=48000,
2005-06-25 21:03:43.613 get_buffer_size returned 6553
2005-06-25 21:03:43.613 set_period_time_near returned 68250
2005-06-25 21:03:43.613 get_period_size returned 3276
2005-06-25 21:03:43.621 Audio fragment size: 4096
2005-06-25 21:03:43.623 Audio Stretch Factor: 1
2005-06-25 21:03:43.623 Ending reconfigure
2005-06-25 21:03:43.624 kickoffOutputAudioLoop: pid = 13790
2005-06-25 21:03:43.624 OutputAudioLoop: Play Event
I am not even sure the problem has anything to do with the S/PDIF port.
Using the envy24control utility, I see that when Myth is "playing", no audio
is being generated on *any* of the soundcard's jacks. When I use
mplayer,xine or aplay, the envy24control utility shows me that audio is
being routed to the S/PDIF jack. If I remove the asound.conf file, and use
aplay, envy24control shows me that the audio is being routed to the first
two analog jacks.
So, how do I debug this? How can I figure out why all other programs will
send sound to my audio card, but Myth is mute? Since Myth is not generating
any errors, I have no idea where to look.
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