“Does this player support USB playback of MKV HEVC 4k UHD HDR10 movies with the TrueHD Atmos track in them? Or will it downsample or fall back to the next track (being a 5.1 of some sort) in that MKV file (granted there's more then one audio track)?”
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The USB port on the LG 4K Ultra-HD Blu-ray Disc™ Player with Dolby Vision®, Model # UBK90 supports XVID, MPEG1 SS, H.264/MPEG-4 AVC, MPEG2 PS, MPEG2 TS, VC-1 SM (WMV3), HEVC Codec formats and it does support the Dolby TrueHD and the Dolby Digital Plus audio formats. Dolby Atmos isn’t actually a soundtrack at all. It’s metadata that piggybacks on top of existing surround sound signals. The object-based Dolby Atmos audio format can be carried in one of two ways: • Compressed in the Dolby Digital Plus container • Lossless in the Dolby TrueHD container.. Dolby TrueHD is a lossless, very high-bandwidth format that is currently only available on Blu-ray and UHD Blu-ray discs. It’s transmitted over an HDMI cable, from a Blu-ray player to an AV receiver, TV, or a soundbar that can pass through the video. HDMI ARC does not have enough data capacity to support the transmission of Dolby Atmos content that is encoded using Dolby TrueHD, which is the format used on Blu-ray Disc and UHD Blu-ray Disc and the feature is only supported in televisions that have native Dolby Atmos decoding. To support Dolby Atmos over HDMI ARC for Blu-ray Disc playback, a television has to decode Dolby TrueHD and transcode it to Dolby Digital Plus before output. TVs with HDMI eARC can do lossless Dolby Atmos pass-through...^IFV
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