[FFmpeg-trac] #8181(undetermined:new): SIGSEGV from libavformat/movenc.c

[FFmpeg]

#8181: SIGSEGV from libavformat/movenc.c
-------------------------------------+-------------------------------------
             Reporter:  Suhwan       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  SIGSEGV      |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 There is SIGSEGV from libavformat/movenc.c
 {{{
 libavformat/movenc.c:3101:47: runtime error: member access within null
 pointer of type 'AVFormatContext' (aka 'struct AVFormatContext')

 Program received signal SIGSEGV, Segmentation fault.
 0x00000000016c14aa in mov_write_udta_sdp (pb=<optimized out>,
 track=<optimized out>)
     at libavformat/movenc.c:3101
 3101        ff_sdp_write_media(buf, sizeof(buf), ctx->streams[0],
 track->src_track,
 (gdb) bt
 #0  0x00000000016c14aa in mov_write_udta_sdp (pb=<optimized out>,
 track=<optimized out>)
     at libavformat/movenc.c:3101
 #1  mov_write_trak_tag (s=0x90cac40, pb=0x90ffe80, mov=0x9104880,
 track=<optimized out>, st=0x9104d00)
     at libavformat/movenc.c:3192
 #2  0x00000000016bb656 in mov_write_moov_tag (pb=<optimized out>,
 mov=0x9104880, s=0x90cac40)
     at libavformat/movenc.c:4012
 #3  0x00000000016a7de4 in mov_write_trailer (s=0x90cac40) at
 libavformat/movenc.c:6773
 #4  0x0000000001791e94 in av_write_trailer (s=<optimized out>) at
 libavformat/mux.c:1283
 #5  0x000000000048ff9c in transcode () at fftools/ffmpeg.c:4726
 #6  0x0000000000487de4 in main (argc=27, argv=<optimized out>) at
 fftools/ffmpeg.c:4894
 }}}
 How to reproduce:
 {{{
 % ./ffmpeg_g -stream_loop 1 -y -r 55 -i xtrem-sport.mp4 -loglevel 40 -map
 0 -c copy -c:s:0 aptx_hd -aframes 20 -ab 636k -ar 48000 -b:v 388k -strict
 1 tmp.mov

 ffmpeg version N-94969-gc2ab998ff3 Copyright (c) 2000-2019 the FFmpeg
 developers
   built with clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
   configuration: --cc=clang --cxx=clang++ --ld=clang --enable-debug
 --toolchain=clang-usan
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8181>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker