[mythtv-users] Occasionally recorded videos have no sound?

Jared C. Davis jared at cs.utexas.edu
Tue Feb 13 02:29:52 UTC 2007


I'm using a PVR-350 and Myth 0.20 on Ubuntu Edgy.  I'm just recording
off the antenna.  Normally everything works fine, but sometimes a
whole show will record and there will be no sound when I try to play
it back.  It still records the video portion, but the movie file
itself seems to have no sound even when I play it with an external
player like mplayer or vlc.

There doesn't seem to be any pattern to the failures, and I've tried
to look at the logs to see if anything shows up there but I don't see
anything particularly telling.  I've attached a backend log, where it
failed to record sound for "The Class" at 19:30, in case that helps at

I don't know how to really figure out what's causing this, and
unfortunately it happens only once or twice a week so it's hard to
reproduce.  The only other thing I can really think about saying is
that sometimes when I'm using XMMS, it'll go to switch songs and I'll
get a message that the sound card is already in use.  I have to click
OK, then i can click again to play the next song.  So maybe there's
something buggy with my sound card drivers, but I don't know if that
would even have any impact on recording the sound to the file.
Anyway, lspci reports that the sound card is the Intel Corporation
82801G (ICH7 Family) variety.

Anyway, any ideas on what I might be able to do to help diagnose this problem?


Jared C. Davis <jared at cs.utexas.edu>
3600 Greystone Drive #604
Austin, TX 78731

2007-02-12 19:30:02.898 TVRec(1): Changing from RecordingOnly to None
2007-02-12 19:30:02.952 Finished recording How I Met Your Mother
"Lucky Penny": channel 1042
2007-02-12 19:30:03.212 Finished recording How I Met Your Mother
"Lucky Penny": channel 1042
0: start_time: 0.036 duration: 161.883
1: start_time: 0.026 duration: 161.829
stream: start_time: 0.289 duration: 1798.808 bitrate=5191 kb/s
2007-02-12 19:30:03.256 AFD: Opened codec 0x81994b0, id(MPEG2VIDEO) type(Video)
2007-02-12 19:30:03.293 AFD: Opened codec 0x8194830, id(MP2) type(Audio)
2007-02-12 19:30:03.477 TVRec(1): Changing from None to RecordingOnly
2007-02-12 19:30:03.508 TVRec(1): HW Tuner: 1->1
2007-02-12 19:30:03.683 Started recording: The Class "The Class Has a
Snow Day": channel 1042 on cardid 1, sourceid 1
2007-02-12 19:30:04.707 Reschedule requested for id 0.
2007-02-12 19:30:05.263 Scheduled 142 items in 0.6 = 0.00 match + 0.55 place
2007-02-12 19:35:20.161 Reschedule requested for id 0.
2007-02-12 19:35:20.724 Scheduled 142 items in 0.6 = 0.06 match + 0.50 place
[mpeg2video @ 0xb7207a68]invalid cbp at 17 2
[mpeg2video @ 0xb7207a68]Warning MVs not available
2007-02-12 19:37:25.683 JobQueue: Commercial Flagging Finished, 2
break(s) found.
0: start_time: 0.036 duration: 323.859
1: start_time: 0.026 duration: 323.840
stream: start_time: 0.289 duration: 3598.539 bitrate=5194 kb/s
2007-02-12 19:37:25.740 AFD: Opened codec 0x8194830, id(MPEG2VIDEO) type(Video)
2007-02-12 19:37:25.753 AFD: Opened codec 0x81994b0, id(MP2) type(Audio)
2007-02-12 19:38:04.085 JobQueue: Commercial Flagging Starting for How
I Met Your Mother "Lucky Penny" recorded from channel 1042 at Mon Feb
12 19:00:00 2007

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