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Designing IP-Based Video Conferencing Systems: Dealing with Lip Synchronization

Chapter Description

Two issues typically complicate the process of decoding audio and video streams and allowing them to play with perfect synchronization. This chapter covers the process of realigning the audio and video streams at the receiver to achieve perfect lip synchronization.

References

ATSC Implementation Subcommittee Finding: "Relative Timing of Sound and Vision for Broadcast Operations," Document IS-191 of the ATSC (Advanced Television Systems Committee), June 2003. www.atsc.org/standards/is_191.pdf

Blakowski and Steinmetz, "A Media Synchronization Survey: Reference Model, Specification, and Case Studies,"IEEE Journal on Selected Areas in Communications, Vol. 14, No. 1, January 1996.

Schulzrinne, H., S. Casner, R. Frederick, and V. Jacobson. IETF RFC 3550, RTP: A Transport Protocol for Real-Time Applications. July 2003.