[FFmpeg-trac] #1458(avfilter:open): aconvert crashes on channel count change (was: FFMPEG Crashing on converting AC3 to AAC)

[FFmpeg]

#1458: aconvert crashes on channel count change
-------------------------------------+------------------------------------
             Reporter:  ramitbhalla  |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  aconvert     |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
-------------------------------------+------------------------------------
Changes (by cehoyos):

 * status:  new => open
 * reproduced:  0 => 1
 * component:  undetermined => avfilter
 * version:  unspecified => git-master
 * keywords:   => aconvert


Comment:

 {{{
 (gdb) r -async 1 -i channelschange.ac3 -f null -
 Starting program: /home/cehoyos/Projects/FFmpeg/ffmpeg_g -async 1 -i
 channelschange.ac3 -f null -
 [Thread debugging using libthread_db enabled]
 ffmpeg version N-41656-g1125606 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Jun 17 2012 21:02:16 with gcc 4.5.3
   configuration: --cc=/usr/local/gcc-4.5.3/bin/gcc --enable-gpl
   libavutil      51. 58.100 / 51. 58.100
   libavcodec     54. 25.100 / 54. 25.100
   libavformat    54.  6.101 / 54.  6.101
   libavdevice    54.  0.100 / 54.  0.100
   libavfilter     2. 81.100 /  2. 81.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 15.100 /  0. 15.100
   libpostproc    52.  0.100 / 52.  0.100
 [ac3 @ 0x14b2120] max_analyze_duration 5000000 reached at 5024000
 [ac3 @ 0x14b2120] Estimating duration from bitrate, this may be inaccurate
 Input #0, ac3, from 'channelschange.ac3':
   Duration: 00:00:07.84, start: 0.000000, bitrate: 192 kb/s
     Stream #0:0: Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s
 -async is forwarded to lavfi similarly to -af
 aresample=min_comp=0.001:min_hard_comp=0.100000.
 [aresample @ 0x14b2d40] chl:stereo fmt:s16 r:48000Hz -> chl:stereo fmt:s16
 r:48000Hz
 Output #0, null, to 'pipe:':
   Metadata:
     encoder         : Lavf54.6.101
     Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (ac3 -> pcm_s16le)
 Press [q] to stop, [?] for help
 Input stream #0:0 frame changed from rate:48000 fmt:s16 ch:2 chl:stereo to
 rate:48000 fmt:s16 ch:6 chl:5.1(side)
 -async is forwarded to lavfi similarly to -af
 aresample=min_comp=0.001:min_hard_comp=0.100000.
 [aresample @ 0x14b77a0] chl:5.1(side) fmt:s16 r:48000Hz -> chl:stereo
 fmt:s16 r:48000Hz

 Program received signal SIGSEGV, Segmentation fault.
 0x00007ffff66b0a37 in memcpy () from /lib64/libc.so.6
 (gdb) bt
 #0  0x00007ffff66b0a37 in memcpy () from /lib64/libc.so.6
 #1  0x0000000000aa8f33 in swr_convert (s=0x14fc280, out_arg=<value
 optimized out>, out_count=0,
     in_arg=<value optimized out>, in_count=296448) at
 libswresample/swresample.c:710
 #2  0x0000000000aa959b in swr_inject_silence (s=0x14fc280, count=296448)
 at libswresample/swresample.c:750
 #3  0x0000000000aa9721 in swr_next_pts (s=0x14fc280, pts=<value optimized
 out>)
     at libswresample/swresample.c:767
 #4  0x000000000044e3b2 in filter_samples (inlink=0x14b2c80,
 insamplesref=0x14e2160)
     at libavfilter/af_aresample.c:182
 #5  0x000000000041f1f3 in ff_filter_samples (link=0x14b2c80,
 samplesref=<value optimized out>)
     at libavfilter/audio.c:214
 #6  0x0000000000423caa in request_frame (link=0x14b2c80) at
 libavfilter/buffersrc.c:445
 #7  0x00000000004211ce in ff_request_frame (link=<value optimized out>) at
 libavfilter/avfilter.c:325
 #8  avfilter_request_frame (link=<value optimized out>) at
 libavfilter/avfilter.c:594
 #9  0x000000000044e203 in request_frame (outlink=0x14b8280) at
 libavfilter/af_aresample.c:214
 #10 0x0000000000420370 in ff_request_frame (link=<value optimized out>) at
 libavfilter/avfilter.c:325
 #11 0x00000000004237c2 in av_buffersink_read (ctx=0x14b2b40,
 buf=0x7fffffffcb90)
     at libavfilter/buffersink.c:109
 #12 0x000000000040d152 in poll_filters () at ffmpeg.c:1927
 #13 0x0000000000410e83 in transcode () at ffmpeg.c:3608
 #14 0x00000000004151b4 in main (argc=<value optimized out>, argv=<value
 optimized out>) at ffmpeg.c:5917
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1458#comment:4>
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