It ensures the file actually contains the movie listed in the title, preventing scams where a file is padded with junk data.
This is the magic behind modern small-sized encodes. The x265 codec compresses video up to 50% more efficiently than the older x264 (AVC) standard. It allows a 720p resolution video to fit into a 300MB file while maintaining crisp visuals and minimizing blocky pixelation during fast action scenes. mkv movies south dual audio 300mb verified