[FFmpeg-trac] #3110(undetermined:new): Extracting streams from 5.1 audio input creates invalid output

[FFmpeg]

#3110: Extracting streams from 5.1 audio input creates invalid output
-------------------------------------+-------------------------------------
               Reporter:  burek      |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:
                Version:             |  undetermined
  unspecified                        |               Keywords:
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 Summary of the bug:
 Trying to extract each channel of the input audio (in 5.1 channel format)
 into a separate stream of 1 output file, produces invalid output (at least
 invalid when played with ffplay or vlc).

 How to reproduce:
 {{{
 ffmpeg -i 6_Channel_ID.wav -map 0:0 -c:a copy -map 0:0 -c:a copy -map 0:0
 -c:a copy -map 0:0 -c:a copy -map 0:0 -c:a copy -map 0:0 -c:a copy
 -map_channel 0.0.0:0.0 -map_channel 0.0.1:0.1 -map_channel 0.0.2:0.2
 -map_channel 0.0.3:0.3 -map_channel 0.0.4:0.4 -map_channel 0.0.5:0.5
 out.wav

 ffmpeg version N-57781-g0610d6e Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Nov  1 2013 18:01:35 with gcc 4.8.2 (GCC)
   configuration: --enable-gpl --enable-version3 --disable-w32threads
 --enable-avisynth --enable-bzlib --enable-fontconfi
 g --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-
 libbluray --enable-libcaca --enable-libfreetyp
 e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame
 --enable-libopencore-amrnb --enable-libopenco
 re-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-
 libschroedinger --enable-libsoxr --enable-libsp
 eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-
 libvo-aacenc --enable-libvo-amrwbenc --enable-li
 bvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-
 libxavs --enable-libxvid --enable-zlib
   libavutil      52. 49.100 / 52. 49.100
   libavcodec     55. 40.101 / 55. 40.101
   libavformat    55. 20.105 / 55. 20.105
   libavdevice    55.  5.100 / 55.  5.100
   libavfilter     3. 90.100 /  3. 90.100
   libswscale      2.  5.101 /  2.  5.101
   libswresample   0. 17.104 /  0. 17.104
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, wav, from '6_Channel_ID.wav':
   Duration: 00:00:05.84, bitrate: 4233 kb/s
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 5.1,
 s16, 4233 kb/s
 File 'out.wav' already exists. Overwrite ? [y/N] y
 Output #0, wav, to 'out.wav':
   Metadata:
     ISFT            : Lavf55.20.105
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 5.1,
 4233 kb/s
     Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 5.1,
 4233 kb/s
     Stream #0:2: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 5.1,
 4233 kb/s
     Stream #0:3: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 5.1,
 4233 kb/s
     Stream #0:4: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 5.1,
 4233 kb/s
     Stream #0:5: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 5.1,
 4233 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #0:0 -> #0:1 (copy)
   Stream #0:0 -> #0:2 (copy)
   Stream #0:0 -> #0:3 (copy)
   Stream #0:0 -> #0:4 (copy)
   Stream #0:0 -> #0:5 (copy)
 Press [q] to stop, [?] for help
 size=   18099kB time=00:00:05.83 bitrate=25401.7kbits/s
 video:0kB audio:18099kB subtitle:0 global headers:0kB muxing overhead
 0.000550%
 }}}

 The output file out.wav plays very choppy in ffplay and vlc.

 The [http://www-
 mmsp.ece.mcgill.ca/Documents../AudioFormats/WAVE/Samples/Microsoft/6_Channel_ID.wav
 input source file "6_Channel_ID.wav"] can be obtained freely from: http
 ://www-mmsp.ece.mcgill.ca/Documents../AudioFormats/WAVE/Samples.html

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3110>
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