Because they are heavily re-encoded (transcoded). A genuine 1080p Blu-ray movie is 25-40GB. MKVCinemas compresses it down to 800MB–2GB, sacrificing audio quality (using AAC instead of DTS-HD) and fine video detail (blocky shadows and banding).
If you love the magic of the big screen but don’t always have time to head out to a theater, is the perfect solution. This guide will walk you through everything you need to know about the MKV Cinemas platform on a personal computer—from installation and key features to tips for getting the best viewing experience. mkvcinemas pc