I've had this problem for a few months now. One out of 10 of my TV stations has no audio. I can watch it with my TV's built in tuner and the audio works, I can also use the "azap -r" with mplayer and the audio works there too. I did a "mythfrontend -v audio", this is the output:
<br><br>2007-02-10 11:19:49.133 TV: Attempting to change from None to WatchingLiveTV<br>2007-02-10 11:19:49.136 Using protocol version 32<br>2007-02-10 11:19:49.488 NVP: Disabling Audio, params(-1,2,44100)<br>2007-02-10 11:19:
49.491 VideoOutputXv: XvMCTex: Init failed<br>2007-02-10 11:19:49.492 VideoOutputXv: XVideo Adaptor Name: 'NV17 Video Overlay'<br>2007-02-10 11:19:50.205 TV: Changing from None to WatchingLiveTV<br>2007-02-10 11:19:
50.213 Realtime priority would require SUID as root.<br>2007-02-10 11:19:50.370 Video timing method: SGI OpenGL<br>2007-02-10 11:19:53.598 NVP: Prebuffer wait timed out 10 times.<br>2007-02-10 11:19:54.756 VideoOutputXv: XvMCTex: Init failed
<br>2007-02-10 11:19:54.761 VideoOutputXv: XVideo Adaptor Name: 'NV17 Video Overlay'<br>2007-02-10 11:19:55.412 AFD: Opened codec 0x27c23b0, id(MPEG2VIDEO) type(Video)<br>2007-02-10 11:19:55.413 AFD: Opened codec 0x27dfca0, id(AC3) type(Audio)
<br>2007-02-10 11:19:55.413 AFD: Audio Track #1 is A/V stream #1 and has 0 channels in the English language(6647399).<br>2007-02-10 11:19:55.415 AFD: Opened codec 0x27f8560, id(MPEG2VIDEO) type(Video)<br>2007-02-10 11:19:
55.416 AFD: Opened codec 0xd26470, id(MPEG2VIDEO) type(Video)<br>2007-02-10 11:19:55.422 AFD: Selected track 1: English AC3 ?ch (A/V Stream #1)<br>2007-02-10 11:19:55.422 AFD: Initializing audio parms from audio track #1
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2007-02-10 11:19:55.423 AFD: Audio format changed<br> from id(NONE) -1Hz -1ch 0bps ; id(NONE) -1Hz -1ch 0bps<br> to id( AC3) 0Hz 0ch 0bps ; id( AC3) 0Hz 0ch 0bps
<br>2007-02-10 11:19:55.423 NVP: Disabling Audio, params(0,0,0)<br>2007-02-10 11:19:56.755 NVP: prebuffering pause<br>2007-02-10 11:19:57.165 TV: Attempting to change from WatchingLiveTV to None<br>2007-02-10 11:19:57.652
TV: Changing from WatchingLiveTV to None<br><br><br>