[FFmpeg-trac] #8003(undetermined:new): Division by zero at libavcodec/aaccoder.c

[FFmpeg]

#8003: Division by zero at libavcodec/aaccoder.c
-------------------------------------+-------------------------------------
             Reporter:  Suhwan       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  ubsan        |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by Suhwan):

 FFmpeg Version: 4.2
 Many division by zero bugs are triggered.
 {{{
 ffmpeg version N-94906-gcb8d6a4e3e 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
   libavutil      56. 35.100 / 56. 35.100
   libavcodec     58. 56.101 / 58. 56.101
   libavformat    58. 32.104 / 58. 32.104
   libavdevice    58.  9.100 / 58.  9.100
   libavfilter     7. 58.102 /  7. 58.102
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
 Guessed Channel Layout for Input Stream #0.1 : mono
 Input #0, asf, from 'tmp.wmv':
   Metadata:
     encoder         : Lavf57.66.105
   Duration: 00:00:05.63, start: 0.000000, bitrate: 647 kb/s
     Stream #0:0: Video: wmv2 (WMV2 / 0x32564D57), yuv420p, 560x320, SAR
 1:1 DAR 7:4, 30 fps, 30 tbr, 1k tbn, 1k tbc
     Stream #0:1(eng): Audio: wmav2 (a[1][0][0] / 0x0161), 48000 Hz, mono,
 fltp, 128 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (wmv2 (native) -> zmbv (native))
   Stream #0:1 -> #0:1 (wmav2 (native) -> aac (native))
 Press [q] to stop, [?] for help
 [aac @ 0x9399480] Bitrate 45 is extremely low, maybe you mean 45k
 The bitrate parameter is set too low. It takes bits/s as argument, not
 kbits/s
 libavcodec/aaccoder.c:554:56: runtime error: division by zero
 libavcodec/aaccoder.c:556:48: runtime error: division by zero
 [mov @ 0x9389400] Using MS style video codec tag, the file may be
 unplayable!
 Output #0, mov, to 'tmp_.mov':
   Metadata:
     encoder         : Lavf58.32.104
     Stream #0:0: Video: zmbv, bgr0, 560x320 [SAR 1:1 DAR 7:4], q=2-31, 292
 kb/s, 14 fps, 14336 tbn, 14 tbc
     Metadata:
       encoder         : Lavc58.56.101 zmbv
     Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono,
 fltp, 0 kb/s
     Metadata:
       encoder         : Lavc58.56.101 aac
 frame=  166 fps=6.0 q=-0.0 Lsize=    9258kB time=00:00:11.78
 bitrate=6434.9kbits/s speed=0.429x
 video:9255kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.024679%
 [aac @ 0x9399480] Qavg: 0.000

 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8003#comment:1>
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