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Downmixing 6 channel AAC to 2 channel? - VideoHelp Forum
https://forum.videohelp.com/threads/385585-Downmixing-6-channel-AAC-to-2-channel
5.1ch audio should always load into Audacity in this order: Front left, Front right, Front centre, LFE, Surround left, Surround right. I generally use foobar2000 for downmixing as the matrix mixer DSP lets you configure the …
Down-mix an AAC Audio Stream to AC3 Dolby Pro Logic II ...
https://www.reddit.com/r/ffmpeg/comments/jrgo4g/downmix_an_aac_audio_stream_to_ac3_dolby_pro/
This should do the trick but I haven’t tested it. ffmpeg -i input -c:v copy -c:a ac3 -ac 2 -af “aresample=matrix_encoding=dplii” output. What this should do is copy the first video track in your file and convert the first audio track to a two channel Dolby Digital track filtered so it uses Dolby Pro Logic II encoding to preserve the surround sound as much as possible.
What Is Downmixing? Part 1: Stereo (LoRo) | TV Tech
https://www.tvtechnology.com/opinions/what-is-downmixing-part-1-stereo-loro
Part of the ATSC audio system, also known as Dolby Digital (AC-3), is the ability to send programming with any number of discrete audio channels up to 5.1 to any viewer- regardless of how many speakers they might have. Reproducing 5.1 channels of audio through a lesser number of speakers requires a process called downmixing.
DPLII downmix AC3/DTS to stereo AAC - HydrogenAud
https://hydrogenaud.io/index.php?topic=62940.0
DPLII downmix AC3/DTS to stereo AAC. and a52dec (from the liba52 package) do to the decoding of mypipe.ac3 (24 bit stereo downmix) and neroAacEnc for encoding. This all works without intermetiate WAV files. The reason I went this way is because mplayer only decodes to 16 bit PCM.
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