Following up...
Here's an attempt at re-mapping audio using "channelmap" as opposed to amix,
amerge, or join
input.mxf is a 4-audio channel video file
Goal of this test to move a1 to a3, a2 to a4, a3 to a1, a4 to a2 and output
the results to a
ffmpeg -i input.mxf \
-filter_complex "channelmap=channel_layout=quad:map=0-2|1-3|2-0|3-1" \
output.mov
Here's the stdout
ffmpeg version 3.1.11 Copyright (c) 2000-2017 the FFmpeg developers
built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
configuration:
libavutil 55. 28.100 / 55. 28.100
libavcodec 57. 48.101 / 57. 48.101
libavformat 57. 41.100 / 57. 41.100
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 47.100 / 6. 47.100
libswscale 4. 1.100 / 4. 1.100
libswresample 2. 1.100 / 2. 1.100
Guessed Channel Layout for Input Stream #0.1 : mono
Guessed Channel Layout for Input Stream #0.2 : mono
Guessed Channel Layout for Input Stream #0.3 : mono
Guessed Channel Layout for Input Stream #0.4 : mono
Input #0, mxf, from 'input.mxf':
Metadata:
product_version : 1.0.47.10029.1
application_platform: MXF::SDK (4.7.6) on Mac OS X
product_uid : d49f75ba-4965-4cfa-9d11-cd87206287e0
uid : e103e154-25da-11ef-80db-804a1469dc20
generation_uid : e103e155-25da-11ef-9902-804a1469dc20
company_name : Avid Technology, Inc.
product_name : Avid MediaProcessor Plug-In
modification_date: 2024-06-08 21:05:48
material_package_umid:
0x060A2B340101010501010D1213C5AB48E0DF86046904068872F3804A1469DC20
timecode : 09:21:59:23
Duration: 00:00:03.29, start: 0.000000, bitrate: 121676 kb/s
Stream #0:0: Video: dnxhd, yuv422p(bt709/unknown/unknown), 1920x1080, SAR
1:1 DAR 16:9, 24 fps, 24 tbr, 24 tbn, 24 tbc
Metadata:
file_package_umid:
0x060A2B340101010501010D1213591381E0DF860469040688E37F804A1469DC20
file_package_name: Source Package
Stream #0:1: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
Metadata:
file_package_umid:
0x060A2B340101010501010D1213591381E0DF860469040688E37F804A1469DC20
file_package_name: Source Package
Stream #0:2: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
Metadata:
file_package_umid:
0x060A2B340101010501010D1213591381E0DF860469040688E37F804A1469DC20
file_package_name: Source Package
Stream #0:3: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
Metadata:
file_package_umid:
0x060A2B340101010501010D1213591381E0DF860469040688E37F804A1469DC20
file_package_name: Source Package
Stream #0:4: Audio: pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s
Metadata:
file_package_umid:
0x060A2B340101010501010D1213591381E0DF860469040688E37F804A1469DC20
file_package_name: Source Package
[Parsed_channelmap_0 @ 0x7fb6757014e0] input channel #1 not available from
input layout 'mono'
[Parsed_channelmap_0 @ 0x7fb6757014e0] input channel #2 not available from
input layout 'mono'
[Parsed_channelmap_0 @ 0x7fb6757014e0] input channel #3 not available from
input layout 'mono'
[Parsed_channelmap_0 @ 0x7fb6757014e0] Failed to configure input pad on
Parsed_channelmap_0
Error configuring complex filters.
Invalid argument
> On Jun 8, 2024, at 15:09, Media Mouth <[email protected]> wrote:
>
> I'm looking to take Avid MXF outputs with up to 20 audio tracks, and mix them
> down to various combinations, e.g. Stereo Mix, Stereo music, mono dialogue
> only, Mono DM&E splits, etc etc. all kinds of permutations and combinations.
>
> So the basic pipeline: Export MXF from Avid with "Direct Out" (i.e. all
> timeline audio tracks sent to discreet channels in the MXF) and then use
> FFmpeg to mix down the audio tracks in any combo.
> If we can figure this out, it will make our post production far more
> efficient.
>
> I perused FFmpeg's docs and various forums, but have yet to find clear,
> comprehensive way to use -map, -filter_complex / amerge and/or amix to
> achieve this.
>
> Thanks
>
> C. Munque.
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