I think Kodi does some casting... Not 100% sure.

Make sure TearFree is enabled in the graphics configuration (google it).

The hardest part in my project was recalibrating the colors because my TV in HDMI-RGB mode (as opposed to YCbCr) displays everything below 10% brightness as black. The rest was done very quickly. I don't even need a sequential-chunk torrent software because I use FreeRapid Downloader and ulozto.net (can download fast enough to play while downloading at reasonable 720p/1080p bitrates, otherwise ulozto-downloader and a 10min wait is needed).