Why is video and audio compression needed and how much compression is required. What are the essentials of MPEG-1 and MPEG-2 video and audio compression technology. What are the various picture types used in MPEG video and what is the role of the VBV model. How MPEG-1 and MPEG-2 audio compression use a psycho-acoustic model. What are the building blocks of an MPEG audio and video decoder. How did video and audio compression technology evolve within MPEG.
New technology gets adopted by the market place once it offers added value in a cost-effective and commercially attractive manner. For audio and video compression, huge market interest evolved when it became evident that they would offer opportunities to introduce new applications and to improve the efficiency of existing applications. Two examples are given below.