Merging multichannel audio tracks from Mumble with ffmpeg -
we record talks through mumble , because mumble has nitfy multichannel feature i'd figured subtitles youtube uploading each track youtube separately for file in *; ffmpeg -loop 1 -r 2 -i "$img" -i "$file" -vf scale=-1:380 -c:v libx264 -preset slow -tune stillimage -crf 18 -c:a copy -shortest -pix_fmt yuv420p -threads 0 "$file".mkv; done can prepend eg. sed shell script nickname each speaker in automatic captions i.e. subtitles youtube. works charm.
but merging tracks ffmpeg gets tricky. use ffmpeg -i input1.ogg -input2.ogg -i input3.ogg -i input4.ogg -input5.ogg -filter_complex "[0:a][1:a][2:a][3:a][4:a] amerge=inputs=5[aout]" -map "[aout]" -ac 2 output.ogg
somehow ffmpeg shortens resulting audio track , don't yet have idea why. tried using longest first , last since including silent tracks made shorter mixdown. here warnings:
[parsed_amerge_0 @ 0x7f8b29f02d20] no channel layout input 1
[parsed_amerge_0 @ 0x7f8b29f02d20] input channel layouts overlap: output layout determined number of distinct input channels
but says
[parsed_amerge_0 @ 0x7f8b29f02d20] no channel layout input 1
even when change order of inputs.
allthough according mumble's documentation tracks should equal length vlc media info shows different track times. however tracks not out of sync cut off @ end.
i have no idea why ffmpeg mentions flac, files vorbis.
ffmpeg -i mumble-2017-09-09-16-33-18-149.210.187.155-chrisaiki2.ogg -i mumble-2017-09-09-16-33-18-149.210.187.155-recorder.ogg -i mumble-2017-09-09-16-33-18-149.210.187.155-steempowerpics.ogg -i mumble-2017-09-09-16-33-18-149.210.187.155-taconator.ogg -i mumble-2017-09-09-16-33-18-149.210.187.155-fuzzynewest.ogg -filter_complex "[0:a][1:a][2:a][3:a][4:a] amerge=inputs=5[aout]" -map "[aout]" -ac 2 output5.ogg
ffmpeg version 2.8.4 copyright (c) 2000-2015 ffmpeg developers built apple llvm version 7.0.2 (clang-700.1.81) configuration: --prefix=/usr/local/cellar/ffmpeg/2.8.4 --enable-shared -- enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable- avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable- libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda libavutil 54. 31.100 / 54. 31.100 libavcodec 56. 60.100 / 56. 60.100 libavformat 56. 40.101 / 56. 40.101 libavdevice 56. 4.100 / 56. 4.100 libavfilter 5. 40.101 / 5. 40.101 libavresample 2. 1. 0 / 2. 1. 0 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 2.101 / 1. 2.101 libpostproc 53. 3.100 / 53. 3.100 input #0, ogg, 'mumble-2017-09-09-16-33-18-149.210.187.155- chrisaiki2.ogg': duration: 00:40:01.19, start: 0.000000, bitrate: 17 kb/s stream #0:0: audio: vorbis, 48000 hz, mono, fltp, 86 kb/s metadata: encoder : libsndfile title : chrisaiki2 input #1, ogg, 'mumble-2017-09-09-16-33-18-149.210.187.155-recorder.ogg': duration: 00:33:57.88, start: 0.000000, bitrate: 1 kb/s stream #1:0: audio: vorbis, 48000 hz, mono, fltp, 86 kb/s metadata: encoder : libsndfile title : recorder input #2, ogg, 'mumble-2017-09-09-16-33-18-149.210.187.155-steempowerpics.ogg': duration: 00:33:53.93, start: 0.000000, bitrate: 1 kb/s stream #2:0: audio: vorbis, 48000 hz, mono, fltp, 86 kb/s metadata: encoder : libsndfile title : steempowerpics input #3, ogg, 'mumble-2017-09-09-16-33-18-149.210.187.155-taconator.ogg': duration: 00:35:36.37, start: 0.000000, bitrate: 6 kb/s stream #3:0: audio: vorbis, 48000 hz, mono, fltp, 86 kb/s metadata: encoder : libsndfile title : taconator input #4, ogg, 'mumble-2017-09-09-16-33-18-149.210.187.155-fuzzynewest.ogg': duration: 00:41:53.23, start: 0.000000, bitrate: 30 kb/s stream #4:0: audio: vorbis, 48000 hz, mono, fltp, 86 kb/s metadata: encoder : libsndfile title : fuzzynewest file 'output5.ogg' exists. overwrite ? [y/n] y [parsed_amerge_0 @ 0x7f8b29f02d20] no channel layout input 1 [parsed_amerge_0 @ 0x7f8b29f02d20] input channel layouts overlap: output layout determined number of distinct input channels [flac @ 0x7f8b2b005600] encoding 24 bits-per-sample output #0, ogg, 'output5.ogg': metadata: encoder : lavf56.40.101 stream #0:0: audio: flac, 48000 hz, stereo, s32 (24 bit), 128 kb/s (default) metadata: encoder : lavc56.60.100 flac stream mapping: stream #0:0 (vorbis) -> amerge:in0 stream #1:0 (vorbis) -> amerge:in1 stream #2:0 (vorbis) -> amerge:in2 stream #3:0 (vorbis) -> amerge:in3 stream #4:0 (vorbis) -> amerge:in4 amerge -> stream #0:0 (flac) press [q] stop, [?] size= 100900kb time=00:33:53.94 bitrate= 406.4kbits/s video:0kb audio:100441kb subtitle:0kb other streams:0kb global headers:0kb muxing overhead: 0.457024%
the amerge documentation states:
if inputs not have same duration, output stop shortest.
amix may better filter case.
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