The LG TV will play the first supported audio track, so with TrueHD, DTS, AC3, if you select the DTS track it will always play the AC3 track.  It doesn't report this change so Emby will report that it is playing DTS, but the TV will actually play the next supported track, AC3 in this case. And to prove this, play a file with a DTS track and an AC3 audio commentary, or just a DTS track (in which case you will get no audio)  
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