For Rajinikanth's Jailer (already mentioned) and other big-budget Tamil films that release via Disney.
Most 4K files use this compression; ensure your media player (like VLC or MPC-HC) is up to date. A Note on Online Safety and Legality 4k Movies Download Tamil
A single 4K Tamil movie can range from 15GB to 50GB depending on the compression and audio tracks. 4k Movies Download Tamil