M2V is a format containing only video data, audio is stored in other accompanied file. The extension is widely used in DVDs and video compression systems. Actually it is an MPEG-2 video stream. M2V is also used in digital TV where serves as a standard that defines the structure of transport streams and data transmission methods.

HEVC or h.265 is the most advanced codec for now because it has the lowest bitrate without losing the image quality. The codec has three main features that distinguishes it from others: parallel decoding, random access to images within the video stream and larger maximum block size. HEVC is aimed to offer the same level of video quality as AVC (h.264), but with improved compression, that is why a video file compressed with the codec will be twice smaller.