Preparing 4K video sources
The LG 55UB850 TV has limited video formats that it can handle. 4K(4096x...) sizes are not allowed, only UHD sizes, the 3840x... are allowed. .mkv files are also not supported. I managed to play mp4 files only. .mp4 and .mkv file names show the container file formats. A container can contain many video, audio and subtitle files of various formats. You can see the file formats supported by each type of containers from the wikipedia link at http://en.wikipedia.org/wiki/Comparison_of_container_formats. That information is a life saver for me in solving the conversion of the 4K short movie, the Tears of Steel, https://www.youtube.com/watch?v=R6MlUcmOul8. It is the fourth movie created using the 3D editing software Blender, an open source project. No wonder it is based in the Netherlands. You can download them using bittorrent more reliably. I got mine with many audio files of ac3 and flac formats. The video is in the h264 format. The subtitles in subrip formats. The original uses mkv...