MP4

Everyone in this computer age is aware of mp3 but hardly a few of them know about another upgrade of mp3 and that is mp4.It is the official filename extension for MPEG-4.

Technique:
The technique used in mp4 is not very different from that of mp3 but the fact that it is much more complex then mp3 cannot be ignored.To know more about mp4 initially the audio formatting has to be understood.For instance if alphabet 'D' has to be said seven times then in audio format it is written as 'D7'.This compresses the audio file to a great extent.As compared to audio file,compression of video file is more difficult and requires more effort.In this compression some specially programmed coding technique is used.Through compression & decompression pictures are transferred to the frequency domain.This is known as Kodak and the same is implemented in the conversion of files in mp4 format.

Advantage of using mp4:

• The biggest advantage of using mp4 technique is its storage capacity.For example a complete hindi movie requires more then 2 CDs for storage but if the same files are converted to mp4 format then more then four movies can be copied on a single CD.
  

Disadvantages of using mp4:

• Every technique has its advantages & disadvantages and this applies to mp4 as well.The invent of mp4 has increased the rate of piracy.
  
• It requires a lot of time to download files in mp4 format.
• And above all,files in mp4 format do not support smooth execution,they often face interrupted reading.

Difference between mp3 & mp4:

The compression method used in mp4 is similar to that of mp3 but the only difference is that mp4 format also supports video files.That is videos are considerably reduced in size when changed in mp4 and this is executed without much compromise with the quality of the content.