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Re: Reception Report: Multimedia Seminar 10/18/2000
Hi -
So let me ask some questions of Greg and Denis about the webcast.
1. Did you both have troubles with the single-stream RN webcast? Denis,
I know you said you did. Greg, did you too? Can you both run a
traceroute from the host you were viewing the webcast on to
media2.bmrc.berkeley.edu? We don't see any problem here viewing the
single stream webcast.
2. We've had regular, but sporadic, trouble with the dual-stream
webcast. It fails maybe 50-60% of the time, but we haven't gotten it to
fail regularly.
Peter, we should send the bug report to RN with cc to Tim's contact
about the dual stream problem. Given that the problem happens pretty
regularly with remote viewers, send them the URL for one of the dual
stream MIG Seminar replays. They should be able to replicate the
problem.
I have some suspicions about what might be happening. I think the dual
stream problem is that the Real Player confuses the response messages
from the two streams so it takes exaggerated action when packets are
delayed/dropped. Sadly, it looks like the do not report statistics
correctly in their stats panel. We've run the streams and watch the
video delay and then catch up, but their panel reports no losses.
I'm also concerned that we're seeing bursty behavior from particular
routers/links (Gigabit Ethernet?) and possibly some policy dropping by a
commercial ISP. Denis, I really need to know your route. The fact that
the single stream didn't play for you is very troubling. I also need to
know what settings you use for network connection and protocol. You
should use UDP/unicast with connection on T1 or LAN.
Larry
--
Professor Lawrence A. Rowe Internet: Rowe@BMRC.Berkeley.EDU
Computer Science Division - EECS Phone: 510-642-5117
University of California, Berkeley Fax: 510-642-5615
Berkeley, CA 94720-1776 URL: http://bmrc.berkeley.edu/~larry