The Birmingham Area Linux UsersMP4 audio formats: AAC
MP4 is an original, the audio format and MPEG-4 is not much of the relationship, just as MP3 and MPEG-3 has nothing to do the same. MP3 is MPEG-1 Audio Layer 3 acronym; wholesale mp4 and is MPEG-2 AAC, is a completely compressed audio formats, such as an increase of the perfect reproduction of the stereo, multi-media control, noise reduction, and other new features, the most important Is, MP4, through a special digital copyright protection technology, which is unmatched by MP3.
MP4 video format: MPEG-4
Now available in the market tends to most of the MP4 multimedia player that can play the AAC can be said to be few and far between. MP4 and even the media as an acronym for MPEG4, which in the past appears to be a fallacy, but the business through constant speculation that the fallacy has become the truth. Now, if you have a computer to the city word hear MP4, is able to play the video format of the concept of multi-media player, and not be able to play the MP4 AAC audio player. This is not a strange phenomenon is no reason for the above mentioned AAC copyright protection, which is many record company to support AAC reasons, to make their players to support AAC, support the need to pay royalties for certain patents or Fee, and, AAC is also a source of the problem, wholesale mp3 is not so open, very few sources of on-line, so the current MP4 audio player development is not yet mature, in view of the status quo, many businesses simply "another body", equivalent MP4 to MPEG-4 Abbreviations such, this also happens to be the MP4 is the next generation of MP3 this law, in addition to having the support of the MP3 music player functions, but also have a powerful MPEG-4 video playback capability, In addition, just "4" in the "3 "From this point of view, the MP4 equivalent to MPEG-4 is reasonable.