MM_Conferencing.ppt

Multimedia conferencing Raphael Coeffic (rco@iptel.org) Based partly on slides of Ofer Hadar, Jon Crowcroft

Which Applications? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is needed? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How to Realize? Centralized ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],How to Realize? Full Mesh

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],How to Realize? End point based

How to Realize? Peer-to-Peer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Transport considerations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

IP Multicast ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Multicast vs. Unicast A E B D C ,[object Object],[object Object],[object Object]

IP Multicast ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

IP Multicast addresses ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Alternatives to Multicast ,[object Object],[object Object],[object Object],[object Object],[object Object]

Application level Multicast vs. unicast Content source Traditional Content source Application level multicast

Conference mixer architecture ,[object Object],[object Object],[object Object],[object Object],[object Object]

Audio Mixing G.711 E G.729 E GSM E Periodic timer B A C X=A+B+C E G.729 E GSM E B A C X-A=B+C X-B=A+C X-C=B+A E: Encoder D: Decoder G.711 D G.729 D GSM D G.711

Audio Quality ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Codecs quality measurements ,[object Object]

Audio quality: packet loss ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Audio quality: jitter ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Adaptive playout ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Adaptive playout (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Adaptive playout (3) ,[object Object],[object Object],[object Object],[object Object],[object Object]

MM_Conferencing.ppt

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MM_Conferencing.ppt