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Passthrough - freedesktop.org
https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Passthrough/
Passthrough output for the GStreamer PulseAudio plugin will be available in the next release (0.10.31) of gst-plugins-good. Once this is installed, you should be able to have passthrough output just work with Totem and most other players that use playbin2. VLC media player and LibVLC support passthrough starting with version 1.1.12.
Settings/System/Audio - Official Kodi Wiki
https://kodi.wiki/view/Audio_settings
Passthrough capable hardware and an AV Receiver capable of decoding some or all of the formats listed below is required. Any formats that the Receiver cannot decode will be decoded by the Kodi Audio Output Decoder using the Output Audio Device specified in setting 1.1 above. If you have a quality AV Receiver, Audio Passthrough should be used. Note:
Analog passthrough - Wikipedia
https://en.wikipedia.org/wiki/Analog_passthrough
Analog passthrough is a feature found on some digital-to-analog television converter boxes.Boxes without analog passthrough only allow digital TV (ATSC standard) to be viewed on older, analog-only (NTSC standard) TVs.Those with analog passthrough allow both digital and analog television to be viewed on older TVs.
5.1 Surround Sound Passthrough On TVs - RTINGS.com
https://www.rtings.com/tv/tests/inputs/5-1-surround-audio-passthrough
5.1 audio passthrough allows you to connect a source device to a TV and have the TV pass the source’s surround sound signal through to a receiver or soundbar. It can help cut down on the number of cables necessary for a surround sound setup, and without much impact on sound quality.
HD Audio passthrough - Kodi
https://forum.kodi.tv/showthread.php?tid=325389
Whatever the Manufacturer or seller of the HiSilicon device in question has told you, they are full of Bullshit and basically lying. There are well known Google Audio Standards that devices Firmware must support to allow Kodi Krypton HD Audio passthrough. There is a whole bunch of info regarding such Android Kodi Krypton HD Audio support in ...
AudioEngine - Official Kodi Wiki
https://kodi.wiki/view/AudioEngine
Support for 24-bit and floating-point audio at up to 384,000hz. Mixing of all streams including GUI sounds even when transcoding audio. Start-up enumeration of hardware audio devices and their capabilities with log output. Bitstreaming support in PAPlayer (XBMC's music player) Upmixing of stereo to full channel layout.
Ffmpeg (convert audio and video in Linux) | My wiki
https://bmaupin.github.io/wiki/applications/multimedia/ffmpeg.html
To copy/passthrough a stream (audio or video) without reencoding it: Use -c copy: ffmpeg -i video.wmv -map 0:3 -c:v libx264 -map 0:a -c:a copy video.mp4. Basic encoding using default formats (mpeg4 video and ac3 audio). (Not recommended except for compatibility): ffmpeg -i video.wmv -b:a 160k video.avi.
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