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Play 5.1 audio in iTunes
https://www.macworld.com/article/204800/itunes_surround.html
Yes, with some fiddling and the help of Perian, iTunes can play 5.1 audio.
How to play 5.1 audio files - Apple Community
https://discussions.apple.com/thread/2569425
iTunes can play AC3 files only on bought movies or with perian installed via optical out. But problems with jumping from one file to the next or changing audio tracks leading to complete hangs of iTunes made me switch to PLEX, which plays everything perfectly even DTS and 5.1 AAC files over spdf optical into 5.1 receiver.(Converting AAC to DD ...
How to get Dolby 5.1 audio on DVD - Toast 10 - Roxio Community
https://forums.support.roxio.com/topic/63848-how-to-get-dolby-51-audio-on-dvd/
What it will do is re-encode the 5.1 track to 2.0. The reason you are getting no audio is I suspect you do not have the perian codec installed. This is available at perian.org. In order to keep the 5.1 Dolby track you need to do several steps. One step is to remove the 5.1 audio track from the h.264 video so it is a standalone .ac3 file.
How to Play 5.1 Dolby Digital Audio in QuickTime Mac OS …
https://www.instructables.com/How-To-Enable-Dolby-Digital-AC3-Passthrough-In-Mac/
1: Insert your Toslink cable into the headphone output on your computer. This may require a Mini Toslink to Toslink adaptor (if you have a Mac Pro or Power Mac G5, then insert it into the Toslink output). 2: Open Audio MIDI Setup, located in the utilities folder, in the applications folder. 3: Under audio output, set the format to 48kHz (48000Hz) and 2ch-24bit (don't select encoded …
Perian - The swiss-army knife of QuickTime® components
Perian allows playback of these audio and video compression techniques, but it does not allow the ability to open the MPEG file format. This is due to limitations within QuickTime itself, and we cannot solve it until Apple designs a better interface. See our rdar on the subject.
5.1 surround on mac mini | MacRumors Forums
https://forums.macrumors.com/threads/5-1-surround-on-mac-mini.627066/
Core-based minis (and beyond) support digital audio (PCM, AC3, dts). VLC, DVD Player, and EyeTV have options for this. Perian could do it with a bit of hacking about (I no longer use Perian, it's possible that later versions made AC3 output available in the GUI).
Will Dolby Surround/DTS/5.1 Digital Sound… - Apple Community
https://discussions.apple.com/thread/1828888
I use the V ictor L ima C harlie program to play DTS surround files thru optical out of my G5 to the opt in of my Pioneer receiver, so I'm guessing you can watch movies in 5.1 this way-just make sure that in Audio Devices in the aforementioned program is set to "Encoded audio out" (or something like that)
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