Audio-video encoding has been around since time immemorial ,nevertheless it a hot topic and hasn't lost its importance at all. Encoding is basically converting one form of a given information into a shorter form , which need not necessarily be cryptic in nature.An elementary form of encoding is converting an octal number to its binary equivalent.
Well, so much so to define encoding.
Most of us amy be familiar with audio encoding ; for example an mp3 is an encoded form of standard raw or wav audio. It is well noted that mp3s occupy lesser space compared to wav files.Similarly, divx and mpeg4 are high compression video encoder-decoders (CODECs).