[FFmpeg-trac] #3727(undetermined:new): Guessed 'ChannelPosition' outputted in audio

FFmpeg trac at avcodec.org
Wed Jun 18 11:12:18 CEST 2014

#3727: Guessed 'ChannelPosition' outputted in audio
             Reporter:  rdwill2      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 Hi Group

 We are currently using ffmpeg to 'chop' IMX files(e.g multiple news clips)
 into individual clips, using the following ffmpeg -map command :-
 >ffmpeg -i D:\OwenMoneyTape\30PC60746MBIB6527895.mov -ss 00:02:00.000
 -scodec copy -map 0:6 -vcodec copy -map  0:1  -acodec copy -map 0:2 -map
 0:3 -map 0:4 -map 0:5 -metadata creation_time="2014-05-01 12:00:00" -to
 00:03:00.000 -y /tmp/clip.mov -report
 The input file contains a video track, 4 audio tracks and a timecode track
 and we are mapping all tracks to the output clip.

 On running mediainfo v0.7.69 on the input file and the output clipped
 file, we are finding that FFmpeg is adding mediainfo field
 'ChannelPositions' field automatically in the output.( note does does
 exist in input IMX file)

 It appears that ffmpeg is guessing the Audio Channel Layout Is there a way
 to prevent FFmpeg to output the Audio Channel or am I using the -map
 command incorrectly. ?
 ( note the all the other fields are spot on and as expected)

 Many thanks

 Richard Williams

Ticket URL: <https://trac.ffmpeg.org/ticket/3727>
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