Video transfers across IP and ATM networks have received much research attention during the last ten years. Various video services are expected in the future, enabled by the rapid development in video coding and broadband network technology. This paper gives an introduction to the issues involved in asynchronous video transfers. Brief overviews of video coding, rate control, multiplexing, as well as delay, error and loss control are given.
Outline 1. Background 2. Asynchronous transfer 3. Digital video 4. The video communication system 5. Perceptual requirements 6. The role of video 7. System trade-offs 8. Video coding Example: MPEG encoding Discussion 9. Rate control Modeling Bounding 10. Information transfer Deterministic multiplexing Statistical multiplexing without quality guarantees Statistical multiplexing with quality guarantees Discussion 11. Delay Delay control 12. Errors and loss Framing Loss concealment Layered (hierarchical) coding 13. ATM and Internet Protocols ATM adaptation layers Internet transport layer 14. Final remarks