[FFmpeg-trac] #8035(undetermined:closed): Issue with audio channel mapping

FFmpeg trac at avcodec.org
Thu Jul 25 11:46:39 EEST 2019

#8035: Issue with audio channel mapping
             Reporter:  svihalekjan  |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:  invalid
             Keywords:               |               Blocked By:
  filter_complex amerge audio        |
  channel mapping                    |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
Changes (by svihalekjan):

 * status:  new => closed
 * resolution:   => invalid


 My bad, {{{-af}}} was not producing any audio for me, because I was also
 using mapping of video streams {{{-map 0:v}}} - in this case it is not
 really necessary, but I will have to use the mapping in future for
 different files.

 With {{{-af}}} I was not able to mark the streams like [a] and then map
 them like {{{-map "[a]"}}}. which is probably correct behavior.

 However, I have found a way to use pan in filter_complex, which allows me
 to map audio/video streams like I need.

 This is what works for me at the end:
 -filter_complex "[0:a:0][0:a:1]amerge=inputs=2,pan=7.1|c0=c0|c1=c1[a]"
 -acodec pcm_s24le -map "[a]"

 I cannot thank you enough Cigaes, your direction helped me a lot as I
 completely omitted using pan filter functionality which is exactly what I

 I am now closing this ticket as invalid as it is not really a bug, but my
 incompetence :)

 Thanks again!

Ticket URL: <https://trac.ffmpeg.org/ticket/8035#comment:7>
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