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Getting DTS 5.1+ sound via S/PDIF or HDMI using PulseAudio ...
https://blogs.gentoo.org/mgorny/2021/07/25/getting-dts-5-1-sound-via-s-pdif-or-hdmi-using-pulseaudio/
For a start, S/PDIF is a pretty antiquated interface originally designed to carry stereo PCM audio. The modern versions of the interface have sufficient bandwidth for up to 192 kHz sampling rate and up to 24 bit audio depth. However, in order to support more than two audio channels, the transmitted sound needs to be compressed.
July 2021 – Michał Górny - blogs.gentoo.org
https://blogs.gentoo.org/mgorny/2021/07/
For a start, S/PDIF is a pretty antiquated interface originally designed to carry stereo PCM audio. The modern versions of the interface have sufficient bandwidth for up to 192 kHz sampling rate and up to 24 bit audio depth. However, in order to support more than two audio channels, the transmitted sound needs to be compressed.
Gentoo Forums :: View topic - Sound on all devices lost ...
https://forums.gentoo.org/viewtopic-p-8683785.html
Note with alsa-plugins[pulseaudio] you should not need .asoundrc anymore, please rename/move it for now. Let's check what you have: currently your pulseaudio default output is via onboard audio card SPDIF out. You can verify if alsa itself works: 'pasuspender -- speaker-test -D iec958:CARD=Intel,DEV=0 -t wav -c 2'
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