Posted on 2006-05-02
Last Modified: 2010-04-26
i have my networks exam coming up and i m supposed 2 refer tannenbaum for data compression techniques.i m unable 2 understand mpeg the types of frames I,P,B,D so please help me understand them.
Question by:shilpi84
    LVL 30

    Assisted Solution


    How about starting right there?
    LVL 23

    Accepted Solution

    LVL 3

    Assisted Solution

    this would give you a vauge idea about how it has/is working.

    There are two Modes of MPEG Compression where two modes consists of follwing steps.

    * Intraframe compression
          1  Exploits spatial redundancy only
          2  Operates on single frames independetly of other frames

    * Interframe compression
          1 Exploits both spatial and temporal redunadancies
          2 Employs motion estimation (MS) without standardizing any MS algorithm
          3 Derives motion-compensated predictions of frames
          4 Finally, it performs JPEG-like compression on the residual frames

    This compression is done on frames The Types of Frames in MPEG

    MPEG has 3 types of frames: I, P, and B

    I frames are stricly intra compressed as in JPEG. Their purpose is to provide random access points to the video

    P frames are motion-compensated forward-predictive-coded frames; they are interframe compressed, and typically provide more compression than I frames

    B frames are motion-compensated bidirectionally-predictive-coded frames; they are interframe compressed, and typically provide the most compression

    The relative numbers of I, P and B frames are arbitrary

    An I frame must occur at least once every 132 frames to provide user-acceptible speed of random access to various parts of a video

    I think this would help you to start of where you can refer tannenbaum and list the points.

    LVL 30

    Expert Comment

    cool. thank you!

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    Highfive Gives IT Their Time Back

    Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

    Suggested Solutions

    In this article we have discussed the manual scenarios to recover data from Windows 10 through some backup and recovery tools which are offered by it.
    Here's a very brief overview of the methods PRTG Network Monitor ( offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…
    Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

    761 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    9 Experts available now in Live!

    Get 1:1 Help Now