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VCR paradigm
The VCR paradigm consists of the control functions typically found on a VCR
such as play, fast forward, rewind, search forward and rewind search.

Multiplexing Multiple Compressed Audio and Video Bit Streams
It is a special requirement retrieved from different storage centres on a network.

It may be received from different storage centres on a network. It may have to be
achieved in a smooth manner to avoid the appearance of a jumpy screen.

Editability
Playback Device Flexibility

CCITT H.261 Video Coding Algorithms (P x 64)

The linear quantizer uses a step algorithm that can be adjusted based on picture
quality and coding efficiency. The H.261 is a standard that uses a hybrid of OCT
and OPCM (differential pulse Code Modulation) schemes with motion

estimation.
It also defines the data format. Each MB contains the OCT coefficients
(TCOEFF) of a block followed by an EOB (a fixed length end-of-block marker).

Each MB consists of block data and an MB header. A GOB (Group of Blocks)
consists of a GOB header. The picture layer consists of a picture header. The
H.261 is designed for dynamic use and provides a fully contained organization

and a high level of interactive control.

Moving Picture Experts Group Compression
The MPEG standards consist of a number of different standards. The MPEG 2
suite of standards consist of standards for MPEG2 Video, MPEG - 2 Audio and

MPEG - 2 systems. It is also defined at different levels, called profiles. The main
profile is designed to cover the largest number of applications. It supports digital
video compression in the range of2 to 15 M bits/sec. It also provides a generic

solution for television worldwide, including cable, direct broadcast satellite, fibre
optic media, and optical storage media (including digital VCRs).

MPEG Coding Methodology
The above said requirements can be achieved only by incremental coding of
successive frames. It is known as interframe coding. If we access information
randomly by frame requires coding confined to a specific frame, then it is known

as intraframe coding. The MPEG standard addresses these two requirements by
providing a balance between interframe coding and intraframe coding. The

MPEG standard also provides for recursive and non-recursive temporal
redundancy reduction.