When I try to play a DVD with audio tracks in mono, I don't get any sound.
the latest Mplayer from atrpms and the latest VLC have no problem playing it with audio.

here is the log I get with mythfrontend -v playback :

libdvdread: Get key for /VIDEO_TS/VTS_01_1.VOB at 0x00000144
libdvdread: Elapsed time 0
libdvdread: Found 1 VTS's
libdvdread: Elapsed time 0
2008-08-01 20:18:16.862 AFD: Opened codec 0x251b5d0, id(MPEG2VIDEO) type(Video)
2008-08-01 20:18:16.862 NVP: Disabling Audio, params(-1,-1,-1)
2008-08-01 20:18:16.887 VideoOutputXv: XVideo Adaptor Name: 'NV17 Video Texture'
2008-08-01 20:18:16.893 DPMS Deactivated 
2008-08-01 20:18:16.919 OSD Theme Dimensions W: 640 H: 480
2008-08-01 20:18:17.486 TV: Changing from None to WatchingPreRecorded
QSettings::sync: filename is null/empty
2008-08-01 20:18:17.488 New DB connection, total: 3
2008-08-01 20:18:17.502 Connected to database 'mythconverg' at host: 192.168.0.21
2008-08-01 20:18:17.612 OpenGLVideoSync()
2008-08-01 20:18:17.652 Video timing method: SGI OpenGL
2008-08-01 20:18:18.028 AFD: Warning, video codec 0x251b5d0 id(MPEG2VIDEO) type (Video) already open.
2008-08-01 20:18:18.303 AFD: codec AC3 has 0 channels
No accelerated IMDCT transform found
2008-08-01 20:18:18.304 AFD: Opened codec 0x4353be0, id(AC3) type(Audio)
2008-08-01 20:18:18.307 Opening audio device 'default'. ch 1(1) sr 48000
2008-08-01 20:18:18.307 Opening ALSA audio device 'default'.
2008-08-01 20:18:18.309 AudioOutput Error: Channels count (1) not available: Invalid argument
2008-08-01 20:18:18.309 AudioOutput Error: Unable to set ALSA parameters
2008-08-01 20:18:18.309 NVP: Disabling Audio, reason is: Unable to set ALSA parameters
2008-08-01 20:18:18.312 AFD: Warning, video codec 0x251b5d0 id(MPEG2VIDEO) type (Video) already open.
2008-08-01 20:18:18.314 AFD: Warning, audio codec 0x4353be0 id(AC3) type (Audio) already open, leaving it alone.
2008-08-01 20:18:18.314 AFD: codec AC3 has 1 channels
2008-08-01 20:18:18.314 AFD: codec AC3 has 0 channels
No accelerated IMDCT transform found
2008-08-01 20:18:18.315 AFD: Opened codec 0x2965570, id(AC3) type(Audio)
2008-08-01 20:18:18.315 NVP: Disabling Audio, params(0,-1,-1)
2008-08-01 20:18:18.317 Opening audio device 'default'. ch 1(1) sr 48000
2008-08-01 20:18:18.317 Opening ALSA audio device 'default'.
2008-08-01 20:18:18.317 AudioOutput Error: Channels count (1) not available: Invalid argument
2008-08-01 20:18:18.317 AudioOutput Error: Unable to set ALSA parameters
2008-08-01 20:18:18.317 NVP: Disabling Audio, reason is: Unable to set ALSA parameters
2008-08-01 20:18:18.321 AFD: Warning, video codec 0x251b5d0 id(MPEG2VIDEO) type (Video) already open.
2008-08-01 20:18:18.321 AFD: Warning, audio codec 0x4353be0 id(AC3) type (Audio) already open, leaving it alone.
2008-08-01 20:18:18.321 AFD: codec AC3 has 1 channels
2008-08-01 20:18:18.321 AFD: Warning, audio codec 0x2965570 id(AC3) type (Audio) already open, leaving it alone.
2008-08-01 20:18:18.321 AFD: codec AC3 has 1 channels
2008-08-01 20:18:18.321 AFD: codec AC3 has 0 channels
No accelerated IMDCT transform found
2008-08-01 20:18:18.321 AFD: Opened codec 0x43a6bd0, id(AC3) type(Audio)
2008-08-01 20:18:18.322 NVP: Disabling Audio, params(0,-1,-1)
2008-08-01 20:18:18.322 Opening audio device 'default'. ch 1(1) sr 48000
2008-08-01 20:18:18.322 Opening ALSA audio device 'default'.
2008-08-01 20:18:18.322 AudioOutput Error: Channels count (1) not available: Invalid argument
2008-08-01 20:18:18.323 AudioOutput Error: Unable to set ALSA parameters
2008-08-01 20:18:18.323 NVP: Disabling Audio, reason is: Unable to set ALSA parameters
