[FFmpeg-trac] #6780(undetermined:new): Runtime error with join filter

[FFmpeg]

#6780: Runtime error with join filter
-------------------------------------+-------------------------------------
             Reporter:  marcop998    |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:
              Version:  git-master   |  undetermined
             Keywords:  join         |               Resolution:
  regression crash abort             |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * keywords:   => join regression crash abort
 * priority:  normal => important
 * version:  unspecified => git-master
 * component:  ffmpeg => undetermined
 * reproduced:  0 => 1


Comment:

 Regression since 76e13bdeaabc7ec49322b3a118dc4805153e0401
 {{{
 $ ffmpeg -i shorter.flac -i longer.flac -filter_complex join=inputs=2 -f
 null -
 ffmpeg version N-88151-ga07ac93 Copyright (c) 2000-2017 the FFmpeg
 developers
   built with gcc 6.3.0 (GCC)
   configuration: --enable-gpl
   libavutil      56.  0.100 / 56.  0.100
   libavcodec     58.  0.100 / 58.  0.100
   libavformat    58.  0.101 / 58.  0.101
   libavdevice    58.  0.100 / 58.  0.100
   libavfilter     7.  0.100 /  7.  0.100
   libswscale      5.  0.100 /  5.  0.100
   libswresample   3.  0.100 /  3.  0.100
   libpostproc    55.  0.100 / 55.  0.100
 Input #0, flac, from 'shorter.flac':
   Metadata:
     ENCODER         : Lavf58.0.101
   Duration: 00:01:00.09, start: 0.000000, bitrate: 97 kb/s
     Stream #0:0: Audio: flac, 44100 Hz, mono, s16
 Input #1, flac, from 'longer.flac':
   Metadata:
     ENCODER         : Lavf58.0.101
   Duration: 00:01:00.12, start: 0.000000, bitrate: 97 kb/s
     Stream #1:0: Audio: flac, 44100 Hz, mono, s16
 Stream mapping:
   Stream #0:0 (flac) -> join:input0
   Stream #1:0 (flac) -> join:input1
   join -> Stream #0:0 (pcm_s16le)
 Press [q] to stop, [?] for help
 Output #0, null, to 'pipe:':
   Metadata:
     encoder         : Lavf58.0.101
     Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
 (default)
     Metadata:
       encoder         : Lavc58.0.100 pcm_s16le
 Assertion !s->input_frames[i] failed at libavfilter/af_join.c:93
 Aborted
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/6780#comment:1>
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