[mythtv-users] Preview errors in mythbackend.log

Tom Greer trgreer at gmail.com
Wed Jun 20 19:00:02 UTC 2007


My wife has been reporting some intermittent problems with the MythTV
box (frontend/backend combo) in our bedroom, so I started inspecting
the backend log files.

In there I find intermittent errors that say "Preview Error: Previewer
file '/xxx/xxx.mpg' is not valid." Here is a snippet of the log
containing some events with the error and some without.
Also in the middle there is a message that says: "QSettings::sync:
filename is null/empty".

2007-06-19 13:08:59.103 Using runtime prefix = /usr
2007-06-19 13:08:59.328 New DB connection, total: 1
2007-06-19 13:08:59.399 Connected to database 'mythconverg' at host: mythtv1
2007-06-19 13:08:59.439 Current Schema Version: 1191
Running as a slave backend.
2007-06-19 13:08:59.504 New DB connection, total: 2
2007-06-19 13:08:59.534 Connected to database 'mythconverg' at host: mythtv1
2007-06-19 13:08:59.568 EITHelper: localtime offset -7:00:00
2007-06-19 13:09:00.217 New DB connection, total: 3
2007-06-19 13:09:00.234 Connected to database 'mythconverg' at host: mythtv1
2007-06-19 13:09:01.844 SetLastChannel(303): cleared: no
2007-06-19 13:09:02.668 Main::Registering HttpStatus Extension
2007-06-19 13:09:02.691 mythbackend version: 0.20.20070327-1 www.mythtv.org
2007-06-19 13:09:02.715 Enabled verbose msgs:  important general
2007-06-19 13:09:03.749 Connecting to master server: 192.168.0.200:6543
2007-06-19 13:09:03.769 Connected successfully
2007-06-20 00:12:52.758 MainServer::HandleAnnounce Playback
2007-06-20 00:12:52.783 adding: mythtv3 as a client (events: 0)
2007-06-20 00:12:52.819 TVRec(3): Changing from None to WatchingLiveTV
2007-06-20 00:12:52.833 TVRec(3): HW Tuner: 3->3
2007-06-20 00:12:54.415 SetLastChannel(303): cleared: yes
2007-06-20 00:12:54.831 LFireDev(001371FFFE06D650): Buffered packets
2000 (8000 KB)
2007-06-20 00:12:55.068 Finished recording An Unfinished Life: channel 1303
2007-06-20 00:12:55.128 Finished recording An Unfinished Life: channel 1303
2007-06-20 00:12:55.150 Preview Error: Previewer file
'/video/recordings/1303_20070620001254.mpg' is not valid.
2007-06-20 00:12:55.150 LFireDev(001371FFFE06D650): Buffered packets
2000 (8000 KB)
2007-06-20 00:13:12.411 SetLastChannel(345): cleared: no
2007-06-20 00:13:12.599 Finished recording An Unfinished Life: channel 1303
0: start_time: -9223372036854.775 duration: -9223372036854.775
1: start_time: -9223372036854.775 duration: -9223372036854.775
stream: start_time: -9223372036854.775 duration: -9223372036854.775
bitrate=15128 kb/s
0: start_time: 1470.772 duration: 1.186
1: start_time: 1470.701 duration: 1.195
stream: start_time: 16341.125 duration: 13.971 bitrate=1675 kb/s
2007-06-20 00:13:12.637 AFD: Opened codec 0xba3520, id(MPEG2VIDEO) type(Video)
2007-06-20 00:13:12.697 AFD: Opened codec 0xba3b90, id(AC3) type(Audio)
2007-06-20 00:13:12.792 LFireDev(001371FFFE06D650): Buffered packets
2000 (8000 KB)
QSettings::sync: filename is null/empty
2007-06-20 00:13:13.583 LFireDev(001371FFFE06D650), Warning: No Input
in 50 msec...
2007-06-20 00:13:13.651 LFireDev(001371FFFE06D650), Warning: No Input
in 100 msec...
2007-06-20 00:13:13.715 LFireDev(001371FFFE06D650), Warning: No Input
in 150 msec...
2007-06-20 00:13:13.791 LFireDev(001371FFFE06D650), Warning: No Input
in 200 msec...
2007-06-20 00:13:13.859 LFireDev(001371FFFE06D650), Warning: No Input
in 250 msec...
2007-06-20 00:13:13.923 LFireDev(001371FFFE06D650), Warning: No Input
in 300 msec...
2007-06-20 00:13:14.171 Finished recording Barbara Taylor Bradford's
Remember: channel 1345
2007-06-20 00:13:14.247 Finished recording Barbara Taylor Bradford's
Remember: channel 1345
2007-06-20 00:13:14.279 Preview Error: Previewer file
'/video/recordings/1345_20070620001312.mpg' is not valid.
2007-06-20 00:13:14.281 LFireDev(001371FFFE06D650): Buffered packets
2000 (8000 KB)
2007-06-20 00:13:14.341 LFireDev(001371FFFE06D650), Warning: No Input
in 350 msec...
2007-06-20 00:23:58.210 SetLastChannel(300): cleared: no
2007-06-20 00:23:58.374 Finished recording Barbara Taylor Bradford's
Remember: channel 1345
0: start_time: -9223372036854.775 duration: -9223372036854.775
1: start_time: -9223372036854.775 duration: -9223372036854.775
stream: start_time: -9223372036854.775 duration: -9223372036854.775
bitrate=15128 kb/s
0: start_time: 1809.947 duration: 57.718
1: start_time: 1809.896 duration: 57.738
stream: start_time: 20109.950 duration: 641.884 bitrate=3769 kb/s
2007-06-20 00:23:58.405 AFD: Opened codec 0x2aaab40d2cc0,
id(MPEG2VIDEO) type(Video)
2007-06-20 00:23:58.420 AFD: Opened codec 0x2aaab40d3330, id(AC3) type(Audio)
2007-06-20 00:23:58.505 LFireDev(001371FFFE06D650): Buffered packets
2000 (8000 KB)
2007-06-20 00:23:59.627 Finished recording Léolo: channel 1300
2007-06-20 00:23:59.694 Finished recording Léolo: channel 1300
2007-06-20 00:23:59.726 Preview Error: Previewer file
'/video/recordings/1300_20070620002358.mpg' is not valid.
2007-06-20 00:23:59.728 LFireDev(001371FFFE06D650): Buffered packets
2000 (8000 KB)
2007-06-20 00:23:59.797 LFireDev(001371FFFE06D650), Warning: No Input
in 400 msec...
2007-06-20 00:35:00.505 Finished recording Léolo: channel 1300
0: start_time: -9223372036854.775 duration: -9223372036854.775
1: start_time: -9223372036854.775 duration: -9223372036854.775
stream: start_time: -9223372036854.775 duration: -9223372036854.775
bitrate=15192 kb/s
0: start_time: 3844.826 duration: 59.351
1: start_time: 3844.774 duration: 59.363
stream: start_time: 42719.706 duration: 660.040 bitrate=3382 kb/s
2007-06-20 00:35:00.596 AFD: Opened codec 0x9e5d40, id(MPEG2VIDEO) type(Video)
2007-06-20 00:35:00.609 AFD: Opened codec 0x9e63f0, id(AC3) type(Audio)
2007-06-20 00:35:01.169 TVRec(3): RingBufferChanged()
2007-06-20 00:35:01.180 Finished recording Léolo: channel 1300
2007-06-20 00:45:01.068 Finished recording Media Lab Results: channel 1300
0: start_time: -9223372036854.775 duration: -9223372036854.775
1: start_time: -9223372036854.775 duration: -9223372036854.775
stream: start_time: -9223372036854.775 duration: -9223372036854.775
bitrate=15192 kb/s
0: start_time: 3904.273 duration: 53.970
1: start_time: 3904.286 duration: 53.914
stream: start_time: 43380.814 duration: 599.666 bitrate=3492 kb/s
2007-06-20 00:45:01.245 AFD: Opened codec 0x9f13d0, id(MPEG2VIDEO) type(Video)
2007-06-20 00:45:01.253 AFD: Opened codec 0x9f1a40, id(AC3) type(Audio)
2007-06-20 00:45:01.587 TVRec(3): RingBufferChanged()
2007-06-20 00:45:01.616 Finished recording Media Lab Results: channel 1300
2007-06-20 03:30:00.951 Finished recording An Angel at My Table: channel 1300
0: start_time: -9223372036854.775 duration: -9223372036854.775
1: start_time: -9223372036854.775 duration: -9223372036854.775
stream: start_time: -9223372036854.775 duration: -9223372036854.775
bitrate=15192 kb/s
0: start_time: 3958.318 duration: 890.930
1: start_time: 3958.315 duration: 890.899
stream: start_time: 43981.274 duration: 9899.262 bitrate=3277 kb/s
2007-06-20 03:30:01.183 AFD: Opened codec 0xa30c00, id(MPEG2VIDEO) type(Video)
2007-06-20 03:30:01.282 AFD: Opened codec 0xa31270, id(AC3) type(Audio)
2007-06-20 03:30:01.460 TVRec(3): RingBufferChanged()
2007-06-20 03:30:01.514 Finished recording An Angel at My Table: channel 1300

Can anyone shed some light as to the cause of these errors.  Is there
something in my setup that I can modify to make these go away? Or are
these software problems that need to be corrected.

A little on the configuration: This frontend/backend box is running
Ubuntu 7.04 (Feisty).  The MythTV software is compiled from SVN very
recently.  The system is connected to a Motorola DCT-6xxx set top box
via firewire.  This is a slave backend.

Any help is appreciated.

Tom


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