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Introduction to MPEG

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   MPEG Media Synchronization

Media synchronization is the process of adjusting the relative timing of media information (such as time aligning audio and video media). Media synchronization typically involves sending timing references in each media stream that can be used to align and adjust the relative timing of multiple media signals.

Media synchronization is especially important for packet based systems that can have variable amounts of delay between media sources. The variable packet transmission time may result in media components being recreated (rendered) at different times.

To provide media synchronization in MPEG systems, a program clock reference (PCR) is used. A PCR is a reference source of timing information that is used as a reference to all the media streams associated with that program. The PCR is a 42-bit field that is transmitted at least every 100 msec.

Figure 1.28 shows how MPEG can be used to time synchronize multiple media channels with each other. This diagram shows that MPEG channels include program clock reference (PCR) time stamps to allow all of the elementary streams to remain time synchronized with each other.

 

Intra-Frame I-Frame Diagram

Media Synchronization Diagram

 

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   MPEG Books

Introduction to MPEG Book

 

 

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Introduction to MPEG

This book explains the basics of audio and video digitization and compression and the standard formats that are used be MPEG. You will learn about the different MPEG audio coders and video coder options.

$19.99 Printed, $16.99 eBook

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