I'm running Emby on a Synology DS416play, which can transcode H.264 4K, but not HEVC 4K. I believe many systems are similar in these capabilities. Currently, if a user tries to transcode a 4K HEVC video, my entire system will hang. It would be brilliant if it was possible to disable 4K HEVC transcoding, and only allow direct streams for this format. 
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