MPEG-2, 4 StandardDigital Video Decoder

Group 18a

MPEG (Motion Pictures Expert Group)

A committee of researchers from all over the world meet and discuss the standards of digital video compression.

So far there are five standards: MPEG-1 -- Used for VideoCD and movie clips and music on the

Internet…mp3 comes from MPEG-1 audio layer 3. MPEG-2 -- Used for Broadcast Digital TV, DVD, and HDTV. MPEG-4 -- Used for low bit-rate video (internet and low-bandwidth

satellite communications. MPEG-7 -- Standard being set for Videophones of the future. MPEG-21 -- New standard that addresses MPEG-2’s current

problems with better solutions.

MPEG-1 Standard

Currently used in some countries as a Video Standard for Video CDs.

Bit rate is around 250 Kilobits per Second…which means about 50 minutes of video can fit on a regular CD.

MP3s are basically MPEG-1’s 3rd audio layer, which is left-right sound.

©1999 Warner Bros. All Rights Reserved

MPEG-2 Standard

Used for Digital Video Broadcasting

Bit rate is around 20 Mbits/Second

MPEG-3 was going to be the HDTV standard, but it is now part of MPEG-2.

Used for DSS, DVD, HDTV and new Digital VCRs and camcorders.

©1997 Paramount Pictures All Rights Reserved

MPEG-4 Standard

This is the standard our project is working with. Rockwell Collins Inc. uses this standard for television viewing on

airplanes using a low bandwidth broadcast satellite from space. Bit rate of 64 kilobits/sec -- 10 Mbits/sec depending on usage. This standard is also a standard for internet video and audio. It

encompasses VRML and object-oriented video along with regular digital video.

MPEG-4 Camcorders are also becoming readily available due to the ability to record 1 hour of video on a 32 MB Data Chip.

MPEG-7, 21

MPEG-7 is the future for Video Phone communications.

MPEG-21 is the future of MPEG-2 and addresses the problems currently associated with that standard.

Problems with MPEG The higher the compression, the

“lossier” the video: Digital Artifacts appear:

Blockiness Mosquito Pattern Motion Errors

Our Design is to minimize these artifacts in highly compressed video

Our project is to take the MPEG video stream and decode it, while applying a filter to make the video look better by reducing the digital artifacts (“blockiness”, etc.)

Digital Artifacts Present

Filter applied and artifacts are removed.

MPEG is the future of Digital VideoFor more information on MPEG, go to the website:http://www.mpeg.org