(Updated October 8, 2002)
Seminar Organizer: Professor Lawrence A. Rowe
[ Mbone SDP (1 Mbs)
| NCast Telepresenter (1.5 Mbs)
| Real Networks (100-400 Kbs)
]
The Berkeley MIG Seminar is held each Wednesday from 12:00 (noon) to 1:30. The seminar is webcast live on the Internet using a variety of technologies (e.g., Mbone tools, Real Networks (RN), etc.). The Mbone webcast includes multiple streams so remote viewers can see both the speaker and the slides -- you can see a screen dump of an Mbone replay using the Mash Collaborator tool. You can also view the seminar through the Access Grid as described below.
The Real Networks webcast shows one stream so viewers typically download a copy of the slides and follow along with the presentation. The slides are published on the BIBS seminar announcement page (follow the link to the current speaker). This week we will be producing an experimental transmission using an NCast Telepresenter. All of these technologies, with the exception of the RN technology, uses the IETF standard for streaming media (i.e., RTP, etc.).
The webcast uses the "University of California, Berkeley" Access Grid Room. You can watch this webcast by using an Access Grid (AG) node (e.g., just go to the "University of California, Berkeley" room off the Institutional Lobby) or by launching the Mbone tools (e.g., vic and rat) on the following sessions:
video: 233.2.171.195/59762/127A SAP announcement will also be published that contains the following SDP announcement.
audio: 233.2.171.195/59764/127
You might want to download a recent version of the Open Mash Mbone tools so that you can get the most recent version of vic. This version has new controls for adjusting the layout of the thumbnail windows (e.g., just type a number in the thumbnails window to change the number of columns and type an 's' to enable scrollbars) and support to play the RTPtv high quality MJPEG stream. You can also run another omvic on the RGB slides stream:
233.3.0.2/11004but be prepared for an initial 1024x768 window when you open the stream. You can view it at half size and read everything on the slides. The frame rate is 1 frame/3 sec. This requires omvic! We do not put this stream into the AG sessions because it will crash agvic.
We will use the AG MOO server for a backchannel chat room. This room can be used both to comment on the production, resolve transmission problems, and ask questions of the speaker.
The NCast Telepresenter stream can be viewed using another Telepresenter or by using the Quicktime Player. We will produce an MPEG1 video stream and PCM audio stream. The transmission will be sent in the following multicast sessions:
video: 233.3.0.2/11000
audio: 233.3.0.2/11002
graphics: 233.3.0.2/11004
The following SDP announcement can be passed to the Qt Player to play the single stream version of the webcast. You can watch the dual stream (i.e, video and graphics) using this page. If you are watching the seminar using another NCast Telepresenter you can join the session using the Telepresenter to join the announced session.
Watch this space for further information about the webcasts.
