I've tested different 4K HDR captures (videos) from my Xbox One X and MX Player Pro is definitely not playing them with HDR where as stock Samsung's stock player is. It's definitely washed out colours and the darker areas appear pale instead of how HDR should be. I've compared on my 4K HDR TV and Samsung stock player with MX player. My TV has a pop up to say HDR and a banner on the S8 stock player. I believe Samsung S8/S8+ use Samsung's own HDR so that is also why Netflix doesn't support the device, where as the note 8 is supported.
I have been trying many 4K HDR files on my Xperia XZ Premium, with all of them, regardless of codec, performing perfectly fine in MX player. However, there is one file I have come across that gives me performance issues, an HDR sample video from Digital Foundry (https://www.digitalfoundry.net/2017-...rt-hdr-sampler). Despite other 4K HEVC HDR 60FPS files (such as Sony's higher bitrate Swordsmith demo http://4kmedia.org/sony-swordsmith-hdr-uhd-4k-demo/) playing back perfectly fine, this one plays back choppily in HW+, and barely plays back at all in HW (SW plays back in untonemapped HDR with heavy slowdown, but that is the case for all HDR files I have tried.) The HW+ performance is the best out of the video players I have tried, with the stock sony video app playing back about the same as HW, and VLC performing worse than that in all modes.
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