Convert mv4 to mpg

What is the difference between .mv4 and .mpg?

Description: M4V is a video container that stores audio and video data used for iTunes files. Files of this type may be protected from illegal viewing and copying with Apple FairPlay DRM. In this case audio or video files should be bought in iTunes store. Not protected files can be viewed almost in any modern player because the format is based on MPEG-4 structure.; The MPG file format, short for MPEG Video, stands for Moving Picture Experts Group Video. It is a popular video file format standardized by the MPEG group, which is known for developing video and audio encoding standards. MPG files are compressed using either MPEG-1 or MPEG-2 compression, making them suitable for storing video data in a compressed form without significantly sacrificing quality. This format is widely used for creating movies that are distributed over the internet due to its good balance between file size and video quality.