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Introduction to MPEG

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MPEG-1

Bitrate 1.2Mbits/s & stereo audio coding 250 kbits/s11172-1 : Systems11172-2 : Video11172-3 : Audio11172-4 : Conformance11172-5 : Software

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Three layersI 128kbits/sII 128kbits/sIII 64kbits/s the best

four modelsmonostereodual (two separate channels )joint stereo

MPEG-1 Audio

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Picture Type and Structure

Picture, Frame, and Field ---MPEG-1 provides picture only (no field)Source Input Format (SIF) ---each picture is divided into a series of

macroblocks and the YCbCr color components are alwaysinterleaved.

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Picture Structure

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Block Diagram of an MPEG-1 Encoder

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Forward Motion Compensation

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Bidirectional Motion Compensation

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Block Diagram of an MPEG Decoder

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Syntax layers in MPEG-1 Video Coding

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MPEG-1 System Structure

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System Target Decoder

MPEG system users an idealized decoder called STD to interpret the pack andpacket headers and deliver the elementary bitstreams to audio and video decoders.DTS: the bits for an access unit are removed from the buffer at decoding timestamp(DTS) in the bitstream.

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System Layer Overview of MPEG-1

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MPEG start code

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