[FFmpeg-trac] #8417(avfilter:new): avfilter does not honor stream ids

[FFmpeg]

#8417: avfilter does not honor stream ids
-------------------------------------+-------------------------------------
             Reporter:  Tupsi        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:
             Keywords:               |  unspecified
  channel_layout                     |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug:
 The audio filter is unable to honor mapping options of audio stream ids
 (a:?). If you try to encode two audio streams in one file in one go with a
 different number of channels (one 5.1 and one 2.0 in my case), you need to
 pass a mapping_family and channel_layouts settings for each stream if you
 use libopus, which seems not possible. If you add -loglevel debug, you can
 see:

 Applying option map (set input stream mapping) with argument 0:0.
 Applying option map (set input stream mapping) with argument 0:1.
 Applying option map (set input stream mapping) with argument 0:2.
 Applying option c:a:0 (codec name) with argument libopus.
 Applying option b:a:0 (video bitrate (please use -b:v)) with argument
 160000.
 Applying option c:a:1 (codec name) with argument libopus.
 Applying option b:a:1 (video bitrate (please use -b:v)) with argument
 96000.
 Applying option c:s (codec name) with argument copy.
 Applying option af:a:0 (set audio filters) with argument
 aformat=channel_layouts=5.1.
 Applying option af:a:1 (set audio filters) with argument
 aformat=channel_layouts=stereo.
 Successfully parsed a group of options.

 Although you do not get a setting for stream one and two, but the 2nd
 settings just overwrites the first one, resulting in both stream getting
 encoded in stereo.



 How to reproduce:
 {{{
 % ffmpeg -i input -map 0:1 -map 0:2 -map 0:3  -c:a:0 libopus -b:a:0 160000
 -c:a:1 libopus -b:a:1 96000 -c:s copy -mapping_family:a:0 1 -af:a:0
 aformat=channel_layouts=5.1 -mapping_family:a:1 0 -af:a:1
 aformat=channel_layouts=stereo output
 ffmpeg version N-95623-gf3fae82de9-g53c21c2d6b+2
 built on Windows 10
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8417>
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