[FFmpeg-trac] #3542(swresample:new): Changing channel layout from downmix to stereo fails

[FFmpeg]

#3542: Changing channel layout from downmix to stereo fails
------------------------------------+--------------------------------------
             Reporter:  cehoyos     |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  important   |                Component:  swresample
              Version:  git-master  |               Resolution:
             Keywords:  regression  |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+--------------------------------------

Comment (by speedyrazor):

 I am having the same issues with this line, looking for a workarround:


 {{{
 ffmpeg -guess_layout_max 0 -i 5.1_Stereo_test.mov -map 0:1 -acodec
 pcm_s24le -y test_01_Mono.wav -map 0:2 -acodec pcm_s24le -y
 test_02_Mono.wav -map 0:3 -acodec pcm_s24le -y test_03_Mono.wav -map 0:4
 -acodec pcm_s24le -y test_04_Mono.wav -map 0:5 -acodec pcm_s24le -y
 test_05_Mono.wav -map 0:6 -acodec pcm_s24le -y test_06_Mono.wav
 -channel_layout stereo -map 0:7 -acodec pcm_s24le test_07_Stereo.wav
 }}}


 {{{
 $ ffmpeg -guess_layout_max 0 -i 5.1_Stereo_test.mov -map 0:1 -acodec
 pcm_s24le -y test_01_Mono.wav -map 0:2 -acodec pcm_s24le -y
 test_02_Mono.wav -map 0:3 -acodec pcm_s24le -y test_03_Mono.wav -map 0:4
 -acodec pcm_s24le -y test_04_Mono.wav -map 0:5 -acodec pcm_s24le -y
 test_05_Mono.wav -map 0:6 -acodec pcm_s24le -y test_06_Mono.wav
 -channel_layout stereo -map 0:7 -acodec pcm_s24le test_07_Stereo.wav
 ffmpeg version 2.1.4 Copyright (c) 2000-2014 the FFmpeg developers
   built on Mar 22 2014 06:02:12 with Apple LLVM version 5.1
 (clang-503.0.38) (based on LLVM 3.4svn)
   configuration: --prefix=/opt/local --enable-swscale --enable-avfilter
 --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-
 libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg
 --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass
 --enable-libbluray --enable-gnutls --enable-fontconfig --enable-
 libfreetype --disable-indev=jack --disable-outdev=xv
 --mandir=/opt/local/share/man --enable-shared --enable-pthreads
 --cc=/usr/bin/clang --enable-vda --arch=x86_64 --enable-yasm --enable-gpl
 --enable-postproc --enable-libx264 --enable-libxvid
   libavutil      52. 48.101 / 52. 48.101
   libavcodec     55. 39.101 / 55. 39.101
   libavformat    55. 19.104 / 55. 19.104
   libavdevice    55.  5.100 / 55.  5.100
   libavfilter     3. 90.100 /  3. 90.100
   libavresample   1.  1.  0 /  1.  1.  0
   libswscale      2.  5.101 /  2.  5.101
   libswresample   0. 17.104 /  0. 17.104
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '5.1_Stereo_test.mov':
   Metadata:
     major_brand     : qt
     minor_version   : 537199360
     compatible_brands: qt
     creation_time   : 2014-03-06 11:25:34
   Duration: 00:01:03.48, start: 0.000000, bitrate: 153967 kb/s
     Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le,
 1920x1080, 144704 kb/s, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 23976 tbn,
 23976 tbc (default)
     Metadata:
       creation_time   : 2014-03-06 11:25:34
       handler_name    : Apple Alias Data Handler
       timecode        : 00:00:00:00
     Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1
 channels (FL), s32, 1152 kb/s (default)
     Metadata:
       creation_time   : 2014-03-06 11:25:34
       handler_name    : Apple Alias Data Handler
     Stream #0:2(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1
 channels (FR), s32, 1152 kb/s (default)
     Metadata:
       creation_time   : 2014-03-06 11:25:34
       handler_name    : Apple Alias Data Handler
     Stream #0:3(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz,
 mono, s32, 1152 kb/s (default)
     Metadata:
       creation_time   : 2014-03-06 11:25:34
       handler_name    : Apple Alias Data Handler
     Stream #0:4(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1
 channels (LFE), s32, 1152 kb/s (default)
     Metadata:
       creation_time   : 2014-03-06 11:25:34
       handler_name    : Apple Alias Data Handler
     Stream #0:5(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1
 channels (BL), s32, 1152 kb/s (default)
     Metadata:
       creation_time   : 2014-03-06 11:25:34
       handler_name    : Apple Alias Data Handler
     Stream #0:6(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1
 channels (BR), s32, 1152 kb/s (default)
     Metadata:
       creation_time   : 2014-03-06 11:25:34
       handler_name    : Apple Alias Data Handler
     Stream #0:7(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz,
 downmix, s32, 2304 kb/s (default)
     Metadata:
       creation_time   : 2014-03-06 11:25:34
       handler_name    : Apple Alias Data Handler
     Stream #0:8(eng): Data: none (tmcd / 0x64636D74) (default)
     Metadata:
       creation_time   : 2014-03-06 11:26:04
       handler_name    : Apple Alias Data Handler
       timecode        : 00:00:00:00
 [auto-inserted resampler 0 @ 0x7f85e2e1ad40] [SWR @ 0x7f85e411bc00] Input
 channel layout 'downmix' is not supported
 [auto-inserted resampler 0 @ 0x7f85e2e1ad40] Failed to configure output
 pad on auto-inserted resampler 0
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3542#comment:3>
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