[mythtv-commits] Ticket #7951: multiple components segfaulting in av_close_input_stream

[MythTV]

#7951: multiple components segfaulting in av_close_input_stream
------------------------------------------------+---------------------------
 Reporter:  Andrew Dranse <ajdranse@…>          |       Owner:  ijr       
     Type:  defect                              |      Status:  new       
 Priority:  minor                               |   Milestone:  unknown   
Component:  MythTV - General                    |     Version:  0.22-fixes
 Severity:  medium                              |     Mlocked:  0         
------------------------------------------------+---------------------------
 After upgrading from debian etch to lenny, and correspondingly upgrading
 to mythtv 0.22, it seems that every time something closes any file which
 was recorded by my backend (mythcommflag, mythfrontend, etc), there is a
 segfault in av_close_input_stream, seemingly related to freeing a pointer
 twice.  i did some digging, and it appears that there is some sort of bad
 audio stream in the recorded files (below from a -v all run of
 mythcommflag):
 2010-01-24 01:34:11.250 AFD: Using ffmpeg for video decoding
 2010-01-24 01:34:11.250 AFD: Looking for decoder for MPEG2VIDEO
 2010-01-24 01:34:11.250 AFD: Opened codec 0x1122180, id(MPEG2VIDEO)
 type(Video)
 2010-01-24 01:34:11.250 AFD: Stream #1, has id 0x80 codec id AC3, type
 Audio, bitrate 0 at 0x1122760
 2010-01-24 01:34:11.250 AFD: codec AC3 has 0 channels
 2010-01-24 01:34:11.250 AFD: Looking for decoder for AC3
 2010-01-24 01:34:11.251 AFD: Opened codec 0x1130560, id(AC3) type(Audio)
 2010-01-24 01:34:11.251 AFD: Audio Track #1 is A/V stream #1 and has 0
 channels in the German language(6776178).
 2010-01-24 01:34:11.251 AFD: Stream #2, has id 0x80 codec id AC3, type
 Audio, bitrate 448000 at 0x1130990
 2010-01-24 01:34:11.251 AFD: codec AC3 has 6 channels
 2010-01-24 01:34:11.251 AFD: Looking for decoder for AC3
 2010-01-24 01:34:11.252 AFD: Opened codec 0x1130ba0, id(AC3) type(Audio)
 2010-01-24 01:34:11.252 AFD: Audio Track #2 is A/V stream #2 and has 6
 channels in the English language(6647399).

 ...

 2010-01-24 01:34:11.260 Input #0, mpegts, from
 '/mythtv/1605_20100123203800.mpg':
 2010-01-24 01:34:11.260   Duration: 00:22:24.60, start: 42095.415356,
 bitrate: 13963 kb/s
 2010-01-24 01:34:11.260     Stream #0.0[0xe0]: Video: mpeg2video, yuv420p,
 1920x1080 [PAR 1:1 DAR 16:9], 1001/60000, 65000 kb/s, 29.97 tbr, 90k tbn,
 59.94 tbc
 2010-01-24 01:34:11.260     Stream #0.1[0x80]: Audio: ac3, 0 channels, s16
 2010-01-24 01:34:11.260     Stream #0.2[0x80]: Audio: ac3, 48000 Hz, 2
 channels (FL|FR|FC|LFE|SL|SR), s16, 448 kb/s

 Stream #0.1 is a german language, 0 channel stream, which seems odd.

 I built the tip (r23254) of the 0.22-fixes branch and replicated the
 problem.

 I will attach the output from running a debug build "mythcommflag --video
 bad_file.mpg" which results in the segfault.  I can provide the video file
 as well if required (it is 5MB).

-- 
Ticket URL: <http://svn.mythtv.org/trac/ticket/7951>
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