Opened 17 years ago
Closed 17 years ago
Last modified 17 years ago
#1086 closed defect (worksforme)
ffmpeg crashes on broken mpeg2
| Reported by: | Owned by: | danielk | |
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| Priority: | minor | Milestone: | 0.20 |
| Component: | mythtv | Version: | head |
| Severity: | medium | Keywords: | |
| Cc: | Ticket locked: | no |
Description
I have a MythTV box with two TT-Budget DVB-C cards and the mpeg2 stream does seem to have occasional errors in it. Now, almost every time whenever a recorded program has some slight errors in it and I use MythWeb to list all recorded programs WITH the option "show_recorded_pixmaps=true" the mythbackend starts looping with errors in creating the requested pixmaps and finally crashes.
I have attached a debug log and gdb-output which have been created with the following parameters:
handle SIGPIPE nostop noprint handle SIG33 nostop noprint set logging on set pagination off set args -v libav,playback,file &> log.txt run thread apply all bt full set logging off
This crash will happen every single time with certain recordings. If there is any need to get more information, I'll be happy to do more tests & debugging.
Attachments (2)
Change History (10)
Changed 17 years ago by
| Attachment: | log.txt.bz2 added |
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comment:1 Changed 17 years ago by
| Milestone: | → unknown |
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| Owner: | changed from Isaac Richards to danielk |
| Summary: | Mythbackend (SVN 8675) crashes while trying to create a Preview-picture with bad(?) mpeg2. → ffmpeg crashes on broken mpeg2 |
Can you play one of the broken files with:
valgrind mythtv name-of-broken-file
And attach the log to this ticket
comment:2 Changed 17 years ago by
| Resolution: | → invalid |
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| Status: | new → closed |
No response from the bug reporter to debugging request, closing ticket.
comment:3 Changed 17 years ago by
| Resolution: | invalid |
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| Status: | closed → reopened |
Not so fast, please! I tried unsuccesfully to run the mpeg2 file with valgrind yesterday evening, but the whole process ground to halt for some reason. I'll try again on this weekend to get the debug log you requested.
comment:4 Changed 17 years ago by
Ok, it seems like I'm unable to get valgrind to produce anything useful, as the whole debug process seems to get stuck with the error message "TV: Waiting for Valgrind..." again and again.
Therefore I've put a 20MB clip of the problematic mpeg2 file available as http://ncircle.nullnet.fi/mythtv/test.mpg in case you might be able to get more information out of the problem. This file produces an error of "[mpeg2video @ 0x111bcc0]get_buffer() failed (stride changed)" and goes into an eternal loop with ffmpeg codec. The file plays just fine with libmpeg2 codec.
comment:5 Changed 17 years ago by
I forgot to mention that I did try recompiling mythtv with --enable-valgrind, but it did not help in this case.
comment:6 Changed 17 years ago by
| Milestone: | unknown → 0.20 |
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comment:7 Changed 17 years ago by
| Resolution: | → worksforme |
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| Status: | reopened → closed |
Attached sample file plays fine all the way through with current SVN. Need a clip that exhibits the problem to debug further.
Mythbackend debug log generated with "-v libav,playback,file"