[FFmpeg-trac] #7288(avfilter:new): The amix filter is truncating a channel on merge

[FFmpeg]

#7288: The amix filter is truncating a channel on merge
-------------------------------------+------------------------------------
             Reporter:  veryflatcat  |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avfilter
              Version:  unspecified  |               Resolution:
             Keywords:  amix         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+------------------------------------

Comment (by veryflatcat):

 Full ffmpeg output:

 {{{

 ffmpeg version 4.0.1-0york0~16.04 Copyright (c) 2000-2018 the FFmpeg
 developers
   built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
   configuration: --prefix=/usr --extra-version='0york0~16.04'
 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
 --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --target-os=linux
 --enable-gpl --disable-stripping --enable-avresample --disable-
 filter=resample --enable-avisynth --enable-gnutls --enable-ladspa
 --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
 --enable-libcdio --enable-libcodec2 --enable-libflite --enable-
 libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme
 --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa
 --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-
 libpulse --enable-librsvg --enable-librubberband --enable-libshine
 --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh
 --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx
 --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2
 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-
 omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394
 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r
 --enable-libopencv --enable-libx264 --enable-shared
   libavutil      56. 14.100 / 56. 14.100
   libavcodec     58. 18.100 / 58. 18.100
   libavformat    58. 12.100 / 58. 12.100
   libavdevice    58.  3.100 / 58.  3.100
   libavfilter     7. 16.100 /  7. 16.100
   libavresample   4.  0.  0 /  4.  0.  0
   libswscale      5.  1.100 /  5.  1.100
   libswresample   3.  1.100 /  3.  1.100
   libpostproc    55.  1.100 / 55.  1.100
 Input #0, matroska,webm, from 'test.mkv':
   Metadata:
     ENCODER         : Lavf57.83.100
   Duration: 00:00:02.05, start: 0.008000, bitrate: 27 kb/s
     Stream #0:0: Audio: opus, 48000 Hz, mono, fltp (default)
     Metadata:
       DURATION        : 00:00:02.023000000
     Stream #0:1: Audio: opus, 48000 Hz, mono, fltp (default)
     Metadata:
       DURATION        : 00:00:02.048000000
     Stream #0:2: Audio: opus, 48000 Hz, mono, fltp (default)
     Metadata:
       DURATION        : 00:00:02.038000000
 File 'test.wav' already exists. Overwrite ? [y/N] y
 Stream mapping:
   Stream #0:0 (opus) -> amix:input0
   Stream #0:1 (opus) -> amix:input1
   Stream #0:2 (opus) -> amix:input2
   amix -> Stream #0:0 (pcm_s16le)
 Press [q] to stop, [?] for help
 Output #0, wav, to 'test.wav':
   Metadata:
     ISFT            : Lavf58.12.100
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 8000 Hz, mono,
 s16, 128 kb/s (default)
     Metadata:
       encoder         : Lavc58.18.100 pcm_s16le
 size=      32kB time=00:00:02.05 bitrate= 127.4kbits/s speed= 169x
 video:0kB audio:32kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.238971%

 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7288#comment:2>
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