[mythtv] Segmentation Fault - Problems With Some Channels Only Help?

nospam312 nospam312 at gmail.com
Fri May 18 20:24:36 UTC 2007

Can anyone confirm if this is a bug as a few people seem to be having
similar problems with specific channels but I am at a loss to what to
try next?

When you watch TV or record from some channels (DVB-T) the backend
segmentation faults and the picture on the frontend just freezes (both
on same machine).  I have included what I think are key terminal and
log output below and a link to the full description of the problem.

Other channels (with higher bitrates) can be watched with no problems
so does not appear to indicate an aerial or other hardware problem.
The main thread is
http://www.gossamer-threads.com/lists/mythtv/users/269444#269444 but
other people seem to be posting similar log outputs.

Many thanks.

terminal.log output
[mpegts @ 0x284990]Parser not found for Codec Id: 94212 !
Input #0, mpegts, from '/storage/recordings/1001_20070514144525.mpg':
 Duration: 00:00:03.4, start: 5639.023467, bitrate: 5036 kb/s
 Stream #0.0[0x258], 1/90000: Video: mpeg2video, yuv420p, 720x576,
1/25, 15000 kb/s, 25.00 fps(r)
 Stream #0.1[0x259](eng), 1/90000: Audio: mp2, 48000 Hz, stereo, 256 kb/s
 Stream #0.2[0x25a](eng), 1/90000: Audio: mp2, 48000 Hz, mono, 64 kb/s
 Stream #0.3[0x25b](eng), 1/90000: Subtitle: dvbsub
 Stream #0.4[0x3ed], 1/90000: Data: 0x0000
 Stream #0.5[0x3ee], 1/90000: Data: 0x0000
 Stream #0.6[0x3ef], 1/90000: Data: 0x0000
 Stream #0.7[0x28a], 1/90000: Data: 0x0000
 Stream #0.8[0x28b], 1/90000: Data: 0x0000
 Stream #0.9[0x28c], 1/90000: Data: 0x0000
[mpeg2video @ 0x34c13a4]MPEG motion vector out of boundary
[mpeg2video @ 0x34c13a4]invalid mb type in P Frame at 4 27
[mpeg2video @ 0x34c13a4]ac-tex damaged at 4 28
Closing PAT Filter: pid=0x0
Closing PMT Filter: pid=0x1048
Segmentation fault
[returns you to shell prompt]

mythbackend.log output
2007-05-14 14:53:38.478 DVBRec(0): 31 PID filters open.
2007-05-14 14:53:38.535 PESPacket: Failed CRC check 0x0 != 0xffffffff
for StreamID = 0x0
2007-05-14 14:53:38.535 DVBRec(0): SetPAT(14208 on 0x1c0f)
2007-05-14 14:53:38.535 CreatePATSingleProgram()
2007-05-14 14:53:38.535 PAT in input stream
[nothing else outputted to log file]

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