[FFmpeg-trac] #3081(avcodec:new): Blackberry10 crash on avformat_find_stream_info
FFmpeg
trac at avcodec.org
Fri Oct 25 08:09:19 CEST 2013
#3081: Blackberry10 crash on avformat_find_stream_info
-------------------------------------+-------------------------------------
Reporter: xsacha | Type: defect
Status: new | Priority: normal
Component: avcodec | Version: git-
Keywords: blackberry, | master
qnx, crash, dict, avcodec | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
I noticed my device was '''randomly''' crashing in
avformat_find_stream_info. The event was only reproducable on Blackberry10
(did not occur on Windows or Android).
I followed the codepath and determined that I was able to fix the crash by
commenting out:
https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/utils.c#L2750
{{{
av_dict_set(options ? &options[i] : &thread_opt, "threads", "1", 0);
}}}
I followed it further in to the avcodec_open2 function where I determined
the crash could be fixed by commenting out:
https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/utils.c#L1181
{{{
av_dict_copy(&tmp, *options, 0);
}}}
Commenting out anything that tmp was used in did not help. It only seemed
to occur from the av_dict_copy.
I was able to reproduce the crash using:
{{{
AVDictionary *foo = NULL; av_dict_copy(&foo, *options, 0);
}}}
My backtrace is uneventful as it doesn't seem to show anything from ffmpeg
despite compiling with -g -O0: http://pastebin.com/jw2kdk4v
How to reproduce:
{{{
While playing back an audio or video in PPSSPP, the application crashes
randomly from avformat_find_stream_info.
Using a recent ffmpeg-git built from github.com/hrydgard/ppsspp-ffmpeg-
history
}}}
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3081>
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