[mythtv-users] Lost audio after upgrade

[Christopher Meredith]

I've been using trunk for a while now with no problems. I upgraded
today from a revision pulled 9/5 (sorry, don't know the revision
number) to r22479. Now my audio has stopped working. I am using a USB
audio device with AC3 passthrough and an HD-PVR. I have ensured my
audio settings are the same as they were before by comparing to the
pre-upgrade database backup. Audio works fine in all my other programs
(mplayer, XBMC, etc.) When I try to play anything back with MythTV, I
get this error on the console:

2009-10-15 23:24:00.912 TV: Attempting to change from None to Watching
WatchingPreRecorded
2009-10-15 23:24:00.966 TV: StartPlayer(0, Watching
WatchingPreRecorded, main) -- begin
2009-10-15 23:24:01.186 AFD: Opened codec 0x506b970, id(H264) type(Video)
2009-10-15 23:24:01.186 AFD: codec AC3 has 6 channels
2009-10-15 23:24:01.187 AFD: Opened codec 0x506c120, id(AC3) type(Audio)
2009-10-15 23:24:01.190 Opening audio device 'default'. ch 2(6) sr
48000 (reenc 0)
2009-10-15 23:24:01.190 AudioOutput Error:
AudioOutputALSA::SetIECStatus: snd_ctl_open(default): No such file or
directory
2009-10-15 23:24:01.190 Opening ALSA audio device 'plughw:1,0'.
2009-10-15 23:24:01.205 NVP(2): Disabling Audio, reason is:
AudioOutputALSA::SetIECStatus: snd_ctl_open(default): No such file or
directory
2009-10-15 23:24:01.220 AudioOutput Error:
AudioOutputALSA::SetIECStatus: snd_ctl_open(default): No such file or
directory
2009-10-15 23:24:01.393 NVP(2): Forcing decode extra audio option on
(Video method requires it).
2009-10-15 23:24:01.394 OSD Theme Dimensions W: 640 H: 480
2009-10-15 23:24:01.681 TV: StartPlayer(0, Watching
WatchingPreRecorded, main) -- end ok
2009-10-15 23:24:01.681 TV: Changing from None to Watching WatchingPreRecorded
2009-10-15 23:24:01.683 Realtime priority would require SUID as root.
2009-10-15 23:24:01.685 OpenGLVideoSync()
2009-10-15 23:24:01.774 Video timing method: SGI OpenGL
2009-10-15 23:24:03.351 TV: Attempting to change from Watching
WatchingPreRecorded to None

Here is the output of 'aplay -L'

front:CARD=default,DEV=0
    USB Sound Device        , USB Audio
    Front speakers
surround40:CARD=default,DEV=0
    USB Sound Device        , USB Audio
    4.0 Surround output to Front and Rear speakers
surround41:CARD=default,DEV=0
    USB Sound Device        , USB Audio
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=default,DEV=0
    USB Sound Device        , USB Audio
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=default,DEV=0
    USB Sound Device        , USB Audio
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=default,DEV=0
    USB Sound Device        , USB Audio
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=default,DEV=0
    USB Sound Device        , USB Audio
    IEC958 (S/PDIF) Digital Audio Output
null
    Discard all samples (playback) or generate zero samples (capture)

Any ideas what's going on here?