[FFmpeg-trac] #8011(undetermined:new): Division by zero at aacpsy.c:336

[FFmpeg]

#8011: Division by zero at aacpsy.c:336
-------------------------------------+-------------------------------------
             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: 4.12
 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 @ 0xad97640] Bitrate 26 is extremely low, maybe you mean 26k
 [aac @ 0xad97640] Using a PCE to encode channel layout "hexadecagonal"
 libavcodec/aacpsy.c:336:69: runtime error: division by zero
 The bitrate parameter is set too low. It takes bits/s as argument, not
 kbits/s
 [mov @ 0xad87400] 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, 200
 kb/s, 1 fps, 16384 tbn, 1 tbc
     Metadata:
       encoder         : Lavc58.56.101 zmbv
     Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz,
 hexadecagonal, fltp, 0 kb/s
     Metadata:
       encoder         : Lavc58.56.101 aac
 libavcodec/aacpsy.c:516:60: runtime error: division by zero
 libavcodec/aacpsy.c:529:12: runtime error: -nan is outside the range of
 representable values of type 'int'
 libavcodec/aaccoder.c:554:56: runtime error: division by zeroitrate=
 0.3kbits/s speed=1.42x
 libavcodec/aaccoder.c:556:48: runtime error: division by zero
 frame=    3 fps=2.2 q=-0.0 size=     256kB time=00:00:02.20 bitrate=
 952.8kbits/s dup=0 drop=65 speed=1.63x  frame=    4 fps=2.1 q=-0.0 size=
 512kB time=00:00:04.70 bitrate= 890.7kbits/s dup=0 drop=139 speed=2.43x
 [mov @ 0xad87400] not writing 'chan' tag due to lack of channel
 information
 frame=    4 fps=2.0 q=-0.0 Lsize=     653kB time=00:00:05.61 bitrate=
 951.4kbits/s dup=0 drop=162 speed=2.78x
 video:645kB audio:6kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.342332%
 [aac @ 0xad97640] Qavg: 0.000
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/8011#comment:2>
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