[FFmpeg-trac] #11224(undetermined:new): -filter_complex "[0:a] ..." does not skip disabled tracks

[FFmpeg]

#11224: -filter_complex "[0:a] ..." does not skip disabled tracks
-------------------------------------+-------------------------------------
             Reporter:  markshw2222  |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Description changed by markshw2222:

Old description:

> IPhone 16 introduced spatial audio. They use multiple audio tracks to
> carry audio. One track is enabled the other is disabled. When specifying
> filter_complex "[0:a]..." the first audio track is selected, even it is
> disabled
> In this case, the disable track also have no audio codec set, so
> conversion fails
>
> ./ffmpeg -y -i ~/Downloads/spatial_audio_test_swapped_short.MOV -map 0:v
> -c:v copy  -filter_complex "[0:a] asetpts=PTS-STARTPTS [output_audio]"
> -map '[output_audio]' -c:a aac ~/multiaudio.mp4
>
> [aist#0:1/none @ 0x122609b40] Decoding requested, but no decoder found
> for: none

New description:

 IPhone 16 introduced spatial audio. They use multiple audio tracks to
 carry audio. One track is enabled the other is disabled. When specifying
 filter_complex "[0:a]..." the first audio track is selected, even it is
 disabled


 Apple spec: https://developer.apple.com/documentation/quicktime-file-
 format/preparing_sound_and_subtitle_alternate_groups_for_use_with_apple_devices/

 In this case, the disable track also have no audio codec set, so
 conversion fails

 ./ffmpeg -y -i ~/Downloads/spatial_audio_test_swapped_short.MOV -map 0:v
 -c:v copy  -filter_complex "[0:a] asetpts=PTS-STARTPTS [output_audio]"
 -map '[output_audio]' -c:a aac ~/multiaudio.mp4

 [aist#0:1/none @ 0x122609b40] Decoding requested, but no decoder found
 for: none

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Ticket URL: <https://trac.ffmpeg.org/ticket/11224#comment:2>
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