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3.10. Channel manipulation - MPlayer
http://www.mplayerhq.hu/DOCS/HTML/en/advaudio-channels.html
MPlayer 's decoder for 6-channel PCM is not capable of downmixing. Here is a way to downmix PCM using pan : The number of output channels is 2, so the first suboption is "2". With six input channels there will be six sets of options.
Linux Notes: mplayer down-mix stereo to mono
https://lglinux.blogspot.com/2007/11/mplayer-down-mix-stereo-to-mono.html
Anonymous said... some can also try my personal setup for down-mixing to mono: mplayer -af pan=1:1 -channels 1 media.avi -softvol -softvol-max 300
MPlayer
https://mplayerhq.hu/DOCS/man/en/mplayer.1.html
mencoder (MPlayer’s Movie Encoder) is a simple movie encoder, designed to encode MPlayer-playable movies (see above) to other MPlayer-playable formats (see below). It encodes to MPEG-4 (DivX/Xvid), one of the libavcodec codecs and PCM/MP3/VBRMP3 audio in 1, 2 or 3 passes.
Audio channel downmix 6->2 works, 6->4 just discards ...
https://github.com/mpv-player/mpv/issues/77
You can try the branch named audio_stuff5 and run mpv with the following command line: mpv sometestfile.mkv -af force=channels=4.0 -channels 8. The -channels 8 is only for disabling stereo-downmix. libavresample/libswresample is used to do the remixing. I'm not sure if these libraries do it correctly, or in a way the user would expect.
Having Pulseaudio downmix Surround 5.1 to Stereo | Blog of ...
https://thedarkgod.wordpress.com/2013/08/26/having-pulseaudio-downmix-surround5-1-to-stereo/
After a good deal of gnashing of teeth, I finally managed to get Pulseaudio to Do The Right Thing™ (which is what the thing I want, not what it wants): downmixing Surround 5.1 to Stereo. The problem was simple: I had a lot of lossless FLAC files containing Surround 5.1 audio (that is, 6 channels).…
DPLII downmix AC3/DTS to stereo AAC - HydrogenAud
https://hydrogenaud.io/index.php?topic=62940.0
mplayer -vo null -dumpaudio -dumpfile mypipe.ac3 -aid 128 soandso.vob 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.
What Is Downmixing? Part 1: Stereo (LoRo) | TV Tech
https://www.tvtechnology.com/opinions/what-is-downmixing-part-1-stereo-loro
Reproducing 5.1 channels of audio through a lesser number of speakers requires a process called downmixing. Simply put, downmixing combines the Left, Right, Center, Left surround, and Right surround channels in a somewhat logical manner to drive stereo or mono speakers. The first rule of downmixing is to discard the LFE channel.
Help Guide | Setting whether to mix down multi-channel ...
https://helpguide.sony.net/hv/fmpx10/v1/en/contents/TP0000525789.html
When [ Downmix] is set to [ Surround ], audio signals are output with the Dolby Surround effects. Select this when connecting an audio device that supports Dolby Surround. Press / / / to select an item you want, then press to confirm. Select ( Settings) – [ Sound] from the Home menu. Select [ Downmix ]. Select [ Stereo] or [ Surround ].
Understanding Audio Downmix and Surround ... - Bob …
https://bobpariseau.com/blog/2018/6/20/understanding-audio-downmix-and-surround-sound-processing-or-wait-ive-got-the-wrong-number-of-speakers
Downmixing is essential. If you don't have speakers to match all the channels in the content, and fail to downmix the audio, some content channels simply get lost. You won't hear what's in those channels. Surround Sound Processing is optional.
audio-channels=downmix results in mono 1ch · Issue …
https://github.com/mpv-player/mpv/issues/4545
mpv version and platform mpv git f8cc184 MacOS 10.12.5 (16F73) Reproduction steps Play the sample file with -no-config -ad-lavc-downmix=yes -audio-channels=downmix Expected behavior The log should say AO: [coreaudio] 48000Hz stereo 2ch f...
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