m4v M4V is a file format developed by Apple for the iTunes store's content and is very similar to the MP4 file extension. M4V is supported exclusively by Apple devices. Other video formats like MP4 and MOV can be converted to M4V in order to run on Apple devices. The most common difference between the M4V and MP4 formats is that M4V offers DRM-Copyright Protection which prevents the copyright of media content. To play a DRM-protected M4V file the computer needs authorization by opening the iTunes account used for buying the media file. However, if the files are not protected by DRM, the user can just rename the file extension from M4V to MP4 in order for it to be recognized by non-apple devices.
mpeg Being the most broadly compatible audio and video container format from the lossy class of containers, the MPEG standards are supported by numerous audio and video products and software applications. The standards were designed to meet the growing need for digital storage of audio and video media. They both utilize a lossy compression to scale down VHS quality digital video and CD audio. The two formats, mpeg-1 and mpeg-2, are the result of the combined efforts of the moving picture experts group which was established in 1988. The mpeg-1 has its beginnings in the same year, with an initial release to public in 1993.