[FFmpeg-trac] #7050(avfilter:open): ffmpeg crashes when trying to use alimiter=attack=0.1 on material with samplerate 8 kHz

[FFmpeg]

#7050: ffmpeg crashes when trying to use alimiter=attack=0.1 on material with
samplerate 8 kHz
-------------------------------------+-------------------------------------
             Reporter:  Rollinnn     |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  alimiter     |               Blocked By:
  crash fpe                          |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * keywords:   => alimiter crash fpe
 * priority:  normal => important
 * status:  new => open
 * component:  undetermined => avfilter
 * reproduced:  0 => 1


Comment:

 {{{
 (gdb) r -i m1\ 8\ KHz.wav -af alimiter=attack=0.1 -f null -
 Starting program: ffmpeg_g -i m1\ 8\ KHz.wav -af alimiter=attack=0.1 -f
 null -
 [Thread debugging using libthread_db enabled]
 Using host libthread_db library "/lib64/libthread_db.so.1".
 ffmpeg version N-90182-g40102a2 Copyright (c) 2000-2018 the FFmpeg
 developers
   built with gcc 6.3.0 (GCC)
   configuration: --enable-gpl
   libavutil      56.  7.101 / 56.  7.101
   libavcodec     58. 13.100 / 58. 13.100
   libavformat    58. 10.100 / 58. 10.100
   libavdevice    58.  2.100 / 58.  2.100
   libavfilter     7. 12.100 /  7. 12.100
   libswscale      5.  0.101 /  5.  0.101
   libswresample   3.  0.101 /  3.  0.101
   libpostproc    55.  0.100 / 55.  0.100
 Guessed Channel Layout for Input Stream #0.0 : stereo
 Input #0, wav, from 'm1 8 KHz.wav':
   Duration: 00:00:01.00, bitrate: 256 kb/s
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 8000 Hz,
 stereo, s16, 256 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 [New Thread 0x7ffff515c700 (LWP 32560)]
 [New Thread 0x7ffff495b700 (LWP 32561)]
 [New Thread 0x7ffff415a700 (LWP 32562)]
 [New Thread 0x7ffff3959700 (LWP 32563)]
 [New Thread 0x7ffff3158700 (LWP 32564)]
 [New Thread 0x7ffff2957700 (LWP 32565)]
 [New Thread 0x7ffff2156700 (LWP 32566)]
 [New Thread 0x7ffff1955700 (LWP 32567)]

 Program received signal SIGFPE, Arithmetic exception.
 0x00000000005b6137 in filter_frame (inlink=inlink at entry=0x2046040,
 in=<optimized out>) at libavfilter/af_alimiter.c:200
 200             buf = &s->buffer[(s->pos + channels) % buffer_size];
 (gdb) bt
 #0  0x00000000005b6137 in filter_frame (inlink=inlink at entry=0x2046040,
 in=<optimized out>) at libavfilter/af_alimiter.c:200
 #1  0x00000000004c03fa in ff_filter_frame_framed (frame=<optimized out>,
 link=0x2046040) at libavfilter/avfilter.c:1115
 #2  ff_filter_frame_to_filter (link=0x2046040) at
 libavfilter/avfilter.c:1263
 #3  ff_filter_activate_default (filter=<optimized out>) at
 libavfilter/avfilter.c:1312
 #4  ff_filter_activate (filter=<optimized out>) at
 libavfilter/avfilter.c:1473
 #5  0x00000000004c3b9c in ff_filter_graph_run_once
 (graph=graph at entry=0x202c500) at libavfilter/avfiltergraph.c:1453
 #6  0x00000000004c4c0c in push_frame (graph=0x202c500) at
 libavfilter/buffersrc.c:181
 #7  av_buffersrc_add_frame_internal (ctx=ctx at entry=0x2044880,
 frame=frame at entry=0x2041bc0, flags=flags at entry=4)
     at libavfilter/buffersrc.c:255
 #8  0x00000000004c50bd in av_buffersrc_add_frame_flags (ctx=0x2044880,
 frame=frame at entry=0x2041bc0, flags=flags at entry=4)
     at libavfilter/buffersrc.c:164
 #9  0x000000000049e367 in ifilter_send_frame (frame=0x2041bc0,
 ifilter=0x20301c0) at fftools/ffmpeg.c:2189
 #10 send_frame_to_filters (ist=ist at entry=0x203ea80,
 decoded_frame=decoded_frame at entry=0x2041bc0) at fftools/ffmpeg.c:2268
 #11 0x000000000049e754 in decode_audio (ist=ist at entry=0x203ea80,
 pkt=0x7fffffffd370, got_output=got_output at entry=0x7fffffffd2e8,
     decode_failed=decode_failed at entry=0x7fffffffd2ec) at
 fftools/ffmpeg.c:2337
 #12 0x00000000004a0e7d in process_input_packet (ist=0x203ea80,
 pkt=0x7fffffffd7e0, no_eof=0) at fftools/ffmpeg.c:2619
 #13 0x000000000047ef57 in process_input (file_index=<optimized out>) at
 fftools/ffmpeg.c:4462
 #14 transcode_step () at fftools/ffmpeg.c:4582
 #15 transcode () at fftools/ffmpeg.c:4636
 #16 main (argc=<optimized out>, argv=<optimized out>) at
 fftools/ffmpeg.c:4839
 (gdb) print buffer_size
 $1 = 0
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/7050#comment:1>
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