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20.04 - PulseAudio not passing AC3/DTS, downmixing to ...
https://askubuntu.com/questions/1364432/pulseaudio-not-passing-ac3-dts-downmixing-to-stero
I've been researching how to get Pulseaudio to pass AC3/DTS directly to my sound system but just can't seem to make it work. So watching movies with AC3 5.1 in a web browser (Plex, Netflix, etc), all get down mixed by Pulseaudio to two channel PCM. I've tried the steps posted on the Help Ubuntu: DigitalAC-3Pulseaudio and that didn't help.
DTS or AC-3 realtime encoder over hdmi via pulseaudio
https://stackoverflow.com/questions/50504246/dts-or-ac-3-realtime-encoder-over-hdmi-via-pulseaudio
I found a way to view my films using mpv it work because if I understand well it bypass pulseaudio. mpv --fullscreen --speed=24000/25025 --hwdec=vaapi --deinterlace=yes --af scaletempo,lavcac3enc=tospdif=yes:bitrate=640:minch=2. But I really would like pulseaudio work itself in AC-3 or DTS to have 5.1 sound through SPDIF.
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, you need to install an appropriate ALSA plugin. If you’d like to use AC3 audio, the plugin is found in media-plugins/alsa-plugins[ffmpeg]. For DTS audio, the package is media-sound/dcaenc[alsa]. The next step is adding the appropriate configuration to /etc/asound.conf. The snippet for AC3 is:
PulseAudio - Official Kodi Wiki
https://kodi.wiki/view/PulseAudio
In order to allow passthrough to work with PulseAudio then it MUST be set to use a 2.0 channel configuration, despite the 2.0 setting this will still allow 5.1 audio from AC3, DTS, and EAC3. Note: PulseAudio does not currently allow TrueHD or DTS-MA passthrough, this is a PulseAudio limitation and not a limitation of the Kodi implementation, in order to get 7.1 audio …
Talk:PulseAudio - Official Kodi Wiki
https://kodi.wiki/view/Talk:PulseAudio
HDMI Pulseaudio and ac3 passthrough - …
https://www.linuxquestions.org/questions/linux-hardware-18/hdmi-pulseaudio-and-ac3-passthrough-945612/
The HDMI is connected to the Nvidia GTX 560Ti card and I have installed the propriatary drivers (295.20) I had linux mint 11 installed before and had sound via HDMI and also ac3 passthrough worked for Dolby surround (via spdif in VLC and Mplayer). I think I uninstalled pulseaudio on my previous Mint 11 to get it to work.
Add alsa profiles for HDMI/AC3 (#1327) · Issues ...
https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/1327
Use case: my AV receiver does not seem to support LPCM 6CH over HDMI but only AC3 or DTS. I use Debian and the DTS encoder dcaenc is...
PulseAudio Sink - Kodi
https://forum.kodi.tv/showthread.php?tid=183436
This PulseAudio Sink is also able to do AC3, DTS and EAC3 passthrough. Alternatively it can be configured to be a 7.1 or 5.1 output device. This is an exclusive OR. PulseAudio only provides AC3, DTS, EAC3 when it is configured to run with 2 channels (which is the default on every Desktop).
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