Pipewire remixing channels from stereo to 5.1

hello i have installed pipewire.

I have a 5.1 sound card, when i play a 5.1 film on vlc it’s works,
but if i play like youtube video only two channels are used.

how to automatically remap stereo sources to all channel like pulseaudio do.

somethong like that by default
because youtube and firefox is only stereo

See: the PipeWire Wiki:

Try setting the following in ~/.config/pipewire/pipewire-pulse.conf:

stream.properties = {
    channelmix.mix-lfe    = true
    channelmix.upmix      = true
    channelmix.lfe-cutoff = 80

Then restart PipeWire:

systemctl --user restart pipewire pipewire-pulse pipewire-media-session

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