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I have a Roku 4 Ultra and the AC3 5.1 no longer works. I began to notice lately that the sound was not as good as it use to be so I checked with a small MP4 I use periodically to check each of my speakers and it now remuxes the file to a .TS using 2 channel stereo where it used to play direct. In fact, I've noticed that almost all of the media I have is now Remuxing where it used to play direct. Also, the setting that asks if I want to Convert Multi-Channel AAC (which is Set to Yes), does not seem to make a difference. Has something changed with the settings in the Roku App or could it be a setting somewhere on the server? - - - I Have a Roku 4 4660X ver. 9.2.0 Build 4807-46 running Emby 3.0.223 and also Emby Beta 4.03 An LG 86UM8070PUA Smart TV Sony HT-RT3 5.1 Soundbar with HDMI ARC connected to TV Note: If I use the Roku's Media Play app, it works correctly. If I use the TV's Emby Player app, it works correctly. If I use the TV's generic DLNA connections app, it works correctly.