mpv-downmix-gui

mpv GUI to modify the parameters to downmix surround sound to stereo

a GUI video player that allows to fine-tune the coefficients of the downmix formula while the video keeps playing

mpv with interactive control of the audio filter option

mpv --af='pan="stereo|..."' video.mp4

aka: equalizer for surround audio channels

normalize

please remember to normalize the volume. in most movie releases, audio tracks are too quiet

1. downmix to stereo: ffmpeg -af pan=...
2. analyze volume: ffmpeg -af loudnorm=i=-14:lra=7:tp=-2:offset=0:linear=true:print_format=json
3. downmix to stereo and normalize volume: ffmpeg -af pan=...,loudnorm=...

see also

• https://ffmpeg.org/ffmpeg-filters.html#loudnorm
• https://github.com/slhck/ffmpeg-normalize

related

• Properly downmix 5.1 to stereo using ffmpeg