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audio - Properly downmix 5.1 to stereo using ffmpeg ...
https://superuser.com/questions/852400/properly-downmix-5-1-to-stereo-using-ffmpeg
Downmixing a 5.1 channel audio stream to stereo with a custom mix algorithm If you want a more high quality downmix, or you absolutely must include the LFE stream into your output, you can use FFmpeg's audio filter switch ( -af) to downmix the audio using a custom mix formula. Downmixing with the ATSC formula (Gregory's answer)
Downmixing 5.1 to 2.0 using ffmpeg - VideoHelp Forum
https://forum.videohelp.com/threads/398232-Downmixing-5-1-to-2-0-using-ffmpeg
Try my clever FFmpeg GUI. It contains a special command line for downmixing 5.1 to stereo. Load your video, click Main, click Modify Audio Stream, click Continue, select the output, select the bitrate, click 5.1 to 2 (Channels), click Convert. Done. If you like the new audio file, remux it with the video. Quote 28th Jul 2020 09:09 #3 Hoser Rob
FFMPEG audio channel manipulation - Flaeri's tech talk
https://blog.otterbro.com/ffmpeg-audio-channel-manipulation/
If you've ever tried to downmix 5.1 audio into a stereo mix, typically using this: ffmpeg -i 6channels.wav -ac 2 stereo.wav Then you know that there are certainly some pitfalls there. By default it just straight up drops the LFE (low frequency ) channel. The center channel also dosent seem right by just pushing it thru -ac 2
FFmpeg - downmixing FLAC 6.1 to AAC 5.1 - Stack Overflow
https://stackoverflow.com/questions/24610892/ffmpeg-downmixing-flac-6-1-to-aac-5-1
Use NeroAacCodec, a free high quality aac encoder by nero. You can use ffmpeg to extract the FLAC track, convert it to wav and send it to NeroAacCodec; I can't guarantee you that either will support 6.1 in/5.1 out, but there's a big chance it'll work better than ffmpeg's built-in …
ffmpeg Audio Channel Count/Downmixing - OBS Forums
https://obsproject.com/forum/threads/ffmpeg-audio-channel-count-downmixing.129072/
I'm trying to downmix from surround into stereo using ffmpeg, and it doesn't seem to be having any effect. Basically, I'm running OBS in surround (4ch) to gain access to higher number channels on my input using the Remuxer plugin, but I'd like the audio in the recorded file to be in stereo so it takes up less space and is more broadly compatible.
Preserving perceived loudness when downmixing audio from 5 ...
https://ffmpeg-user.ffmpeg.narkive.com/lugICrAe/preserving-perceived-loudness-when-downmixing-audio-from-5-1-ac3-to-stereo-aac
Down mixing is not ideal. Lower volume is expected. If you don't want the result to clip then you have to normalise enough to allow for all input channels being full level - even though that may be rare in practice. As you are dealing with ac3 Therein …
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