I also checked for 5.1 surround and only got stereo despite the content being marked as 5.1. Very dissapointing.
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But Infuse had to build their own video engine to do so, bypassing the tvOS functionality, and even then only passes the lossy core of DTS and Dolby Digital.
Correct but your statement maintains that the tvOS is incapable of doing it. That's false. Its possible to do if you don't use the built in video player.