[FFmpeg-user] 7.1 wave filter complex amerge issue

[Bouke]

Trying to remap channels in a 7.1 Wave file, but that gives me a strange error.

(I’ve reduced my lines to the most simple to reproduce.)

When I use the same input file, but do a 5.1 remap it works as expected:
/Applications/ffmpeg -i /Volumes/Data/LC_testfiles/8chan.wav -filter_complex "[0:0][0:0][0:0][0:0][0:0][0:0]amerge=inputs=6,pan=5.1|c0=c0|c1=c1|c2=c2|c3=c3|c4=c4|c5=c5|[mix]" -map "[mix]" -f null - 

BUT, with 7.1 it fails
/Applications/ffmpeg -i /Volumes/Data/LC_testfiles/8chan.wav -filter_complex "[0:0][0:0][0:0][0:0][0:0][0:0][0:0][0:0]amerge=inputs=8,pan=7.1|c0=c0|c1=c1|c2=c2|c3=c3|c4=c4|c5=c5|c6=c6|c7=c7|[mix]" -map "[mix]" -f null - 

Is it me, or is this a bug?

Bouke

Output:
ffmpeg version 4.3.1-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2000-2020 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, wav, from '/Volumes/Data/LC_testfiles/8chan.wav':
  Metadata:
    encoded_by      : Pro Tools
    originator_reference: aaizN!wd5kQk
    date            : 2021-01-22
    creation_time   : 16:15:18
    time_reference  : 0
    umid            : 0x060A2B340101010501010F1013000000A2B90D6FE7648000E87D71677E54073C
  Duration: 00:07:51.07, bitrate: 9264 kb/s
    Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, 7.1, s32 (24 bit), 9216 kb/s
Stream mapping:
  Stream #0:0 (pcm_s24le) -> amerge:in0
  Stream #0:0 (pcm_s24le) -> amerge:in1
  Stream #0:0 (pcm_s24le) -> amerge:in2
  Stream #0:0 (pcm_s24le) -> amerge:in3
  Stream #0:0 (pcm_s24le) -> amerge:in4
  Stream #0:0 (pcm_s24le) -> amerge:in5
  Stream #0:0 (pcm_s24le) -> amerge:in6
  Stream #0:0 (pcm_s24le) -> amerge:in7
  pan -> Stream #0:0 (pcm_s16le)
Press [q] to stop, [?] for help
[Parsed_amerge_0 @ 0x7f8654504240] No channel layout for input 1
[Parsed_amerge_0 @ 0x7f8654504240] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
[auto_resampler_0 @ 0x7f8654508300] [SWR @ 0x7f8655811000] Value 2147483647.000000 for parameter 'ich' out of range [0 - 64]
[auto_resampler_0 @ 0x7f8654508300] [SWR @ 0x7f8655811000] Value 2147483647.000000 for parameter 'och' out of range [0 - 64]
[auto_resampler_0 @ 0x7f8654508300] [SWR @ 0x7f8655811000] Input channel count and layout are unset
[auto_resampler_0 @ 0x7f8654508300] 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 #0:0
Conversion failed!