MP4 it's a kind of media file and a compression method from video and Audio . It is a document that contains a video and an audio track, which can be encoded in different ways.
The notion of MP4 comes from MPEG-4 Part 14 . It can be said that it is a standard which applies to various coding formats and technologies related to Moving Picture Experts Group (MPEG ).
The MP4 is used for the transmission of audiovisual content through Internet , especially for him streaming . It is also used in videoconferences and in television applications.
Experts define MP4 as a container format : stores video data and Audio together with the information necessary for its synchronization according to a format set in its technical specifications. The audiovisual tracks, in this framework, are compressed according to various codecs.
It is important not to confuse MP4 with MP3 . While the MP4 includes audio and video, the MP3 format is associated with a compressed audio file with signal losses that do not usually significantly affect its quality.
Because the MP4 is an audio and video container format that works with different codecs, it can contain sounds MP3 encoded. However, an MP3 file cannot include videos.
Also called MP4, on the other hand, portable digital media file player . Many times these dispositives are incompatible with the files .mp4 ; Anyway, this name is appealed to present them as an evolution of MP3 players, focused exclusively on audio.