[FFmpeg-trac] #4097(ffmpeg:new): How to manually set `mono` for the channel layout

[FFmpeg]

#4097: How to manually set `mono` for the channel layout
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:
  michael.heuberger                  |  enhancement
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 When encoding the video, I always see this warning

 {{{
 Guessed Channel Layout for  Input Stream #1.0 : mono
 }}}

 I want this warning to disappear by manually setting the channel layout to
 mono. So that ffmpeg does not have to guess it. How can I do this? I did
 some research but didn't find such an option to manually set it. Can you
 add one?

 How to reproduce:
 {{{
 % ffmpeg -r 14.563322542394877 -f image2 -i /home/michael-
 heuberger/binarykitchen/code/videomail.io/var/local/tmp/clients/videomail.io/11e4
 -686f-55c3c770-9cab-b5660842b8b4/frames/%d.jpg -i /home/michael-
 heuberger/binarykitchen/code/videomail.io/var/local/tmp/clients/videomail.io/11e4
 -686f-55c3c770-9cab-b5660842b8b4/videomail_preview.wav -y -acodec
 libfdk_aac -ar 44100 -ac 1 -vcodec libx264 -preset ultrafast -profile:v
 baseline -crf 24 -pix_fmt yuv420p -loglevel warning -movflags faststart
 /home/michael-
 heuberger/binarykitchen/code/videomail.io/var/local/tmp/clients/videomail.io/11e4
 -686f-55c3c770-9cab-b5660842b8b4/videomail_preview.mp4
 }}}

 {{{
 $ ffmpeg
 ffmpeg version 2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
   built on Oct 10 2014 15:15:58 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
   configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-
 avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3
 --enable-x11grab --enable-libpulse --enable-libopencore-amrnb --enable-
 libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb
 --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis
 --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex
 --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid
   libavutil      54.  7.100 / 54.  7.100
   libavcodec     56.  1.100 / 56.  1.100
   libavformat    56.  4.101 / 56.  4.101
   libavdevice    56.  0.100 / 56.  0.100
   libavfilter     5.  1.100 /  5.  1.100
   libavresample   2.  1.  0 /  2.  1.  0
   libswscale      3.  0.100 /  3.  0.100
   libswresample   1.  1.100 /  1.  1.100
   libpostproc    53.  0.100 / 53.  0.100
 Hyper fast Audio and Video encoder
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4097>
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