locked
Multicast Video in OCS 2007 R2 ? RRS feed

  • Question

  • Can someone can confirm the possibility to do multicast videoconferencing in OCS 2007?

    I tried to find the answer in several places and couldn't find it.

    Thanks in advance.

    Sebastien
    Friday, March 13, 2009 3:39 PM

All replies

  • OCS doesn't do video in multicast, the MCU sends the video stream directly to each connected client.
    Jeff Schertz, PointBridge | MVP | MCITP: Enterprise Messaging | MCTS: OCS
    Friday, March 13, 2009 3:43 PM
    Moderator
  • Thanks Jeff for your answer.

    I'm reading the OCS  Evaluation Guide and it says, page 25: "Multi-Party Audio/Video Conferencing in a Web Conference : Users can hold 1:1 or multi-party IP audio and video conversations whilst in a web conference."

    How is it handled in OCS as far as bandwith?

    Thanks.

    Sebastien
    Monday, March 16, 2009 7:27 PM
  •  Each client transmits a pair of send and receive video streams of (max) 320kps each in Real Time Video (RTV) with the MCU (A/V Conferencing Server) during multi-party meetings.  One-to-one OC conferencing (not using the Live Meeting client) are peer-to-peer.  RTV is a variable-bit codec so the data stream can be reduced if needed (at the expense of lost quality).

    The breakdown is that the Active speaker is sending their video stream and receiving the stream of the last active speaker (2 streams), and the previous speaker is also sending and receiving (2 streams), while all other attendees are only receiving the single video stream of the active speaker, not sending (1 stream).  As each person speaks and the MCU marks them as the 'new' current speaker their video streams will begin sending to the MCU and the older speakers will stop then sending video.  The MCU only sends out the current and most recent previous speaker's video streams.
    Jeff Schertz, PointBridge | MVP | MCITP: Enterprise Messaging | MCTS: OCS
    Tuesday, March 17, 2009 1:31 PM
    Moderator
  • Thanks Jeff for this enlightenment.

    Would you then suggest OCS as a videoconferencing solution if most of the video conferences are to be be multi-party?

    Thanks.


    Sebastien
    Tuesday, March 17, 2009 1:43 PM