I have tried H.264 (AVC and AAC) with .mp4 container I have also tried H.265 I have converted videos using Pavtube HD Video Convertor to different profiles (Panasonic TVs, Matroska Videos and a few custom made Matroska profiles). None of these worked My TV, for the record, does play Matroska files. I'm attaching a screenshot from MedaInfo of one of the mkv files it is able to play: And here is the info of a mp4 that I converted to mkv: If you guys want I can share similar screenshots of all the mp4 files (h.264 and h.265) that I've tried. I have also tried NTFS and FAT32 file systems. In both the cases I was able to play HD files but not 4K ones. So where am I going wrong? Is there any possibility that 4K content doesn't play over USB? On all the forums I've read people say that it shouldn't be a problem. I haven't tried HDMI yet. The TV has three HDMI ports and only one of it says 4K/2K. I have a laptop with GeForce GT540M which can give a max res of 2560x1600. The laptop display though, maxes out at 1366x768. So even if I connect it to the TV, it won't be a 4K stream, right? I do have a desktop PC but playing 4K via that will be too cumbersome and also expensive since I'll have to upgrade by GPU.