Input channel layout '5 channels (FL+FR+FC+LFE+BL)' is not supported

[ralambda]

Summary of the bug
When using input sources with 1 video stream and 1 audio stream that contains 5 channels, within a MOV container; FFmpeg assumes the audio stream has a 5.1 surround channel layout in the following pattern: "FL+FR+FC+LFE+BL".

This is not a valid 5.1 layout - it is missing channel "BR".

But in reality it is not a 5.1 layout at all. It's just 5 mono channels contained within 1 audio stream.

How to reproduce

ffmpeg -i {input}.mov {output}.mp4

Input must contain

• mov container
  • video stream
    • video track
  • audio stream
    • audio track (channel 1)
    • audio track (channel 2)
    • audio track (channel 3)
    • audio track (channel 4)
    • audio track (channel 5)

Command and Error

ffmpeg -i {input}.mov {output}.mp4

ffmpeg version N-90584-g37d472a906 Copyright (c) 2000-2018 the FFmpeg developers
  built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  configuration: --prefix=/usr/local --enable-gpl --enable-nonfree --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libopus --enable-libxvid --samples=fate-suite/
  libavutil      56. 12.100 / 56. 12.100
  libavcodec     58. 17.100 / 58. 17.100
  libavformat    58. 10.100 / 58. 10.100
  libavdevice    58.  2.100 / 58.  2.100
  libavfilter     7. 14.100 /  7. 14.100
  libswscale      5.  0.102 /  5.  0.102
  libswresample   3.  0.101 /  3.  0.101
  libpostproc    55.  0.100 / 55.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '{input}':
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    creation_time   : 2018-05-06T21:06:23.000000Z
  Duration: 00:00:01.17, start: 0.000000, bitrate: 191677 kb/s
    Stream #0:0(und): Video: prores (apch / 0x68637061), yuv422p10le(bt709, progressive), 1920x1080, 187821 kb/s, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 24k tbn, 24k tbc (default)
    Metadata:
      creation_time   : 2018-05-06T21:06:23.000000Z
      handler_name    : Core Media Data Handler
      encoder         : Apple ProRes 422 HQ
      timecode        : 04:12:44:07
    Stream #0:1(und): Audio: pcm_s16le (lpcm / 0x6D63706C), 48000 Hz, 5 channels (FL+FR+FC+LFE+BL), s16, 3840 kb/s (default)
    Metadata:
      creation_time   : 2018-05-06T21:06:23.000000Z
      handler_name    : Core Media Data Handler
    Stream #0:2(und): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
    Metadata:
      creation_time   : 2018-05-06T21:06:23.000000Z
      handler_name    : Core Media Data Handler
      timecode        : 04:12:44:07
Stream mapping:
  Stream #0:0 -> #0:0 (prores (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[aac @ 0x7f9aaa025a00] Unsupported channel layout
Error initializing output stream 0:1 -- Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!

Additional Errors

[auto_resampler_0 @ 0x7f7fab404c40] [SWR @ 0x7f7fae004800] Input channel layout '5 channels (FL+FR+FC+LFE+BL)' is not supported
[auto_resampler_0 @ 0x7f7fab404c40] Failed to configure output pad on auto_resampler_0
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:1

[Carl Eugen Hoyos]

Please provide the input sample and please explain how it was created.