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turbostas
Participant
April 25, 2007
Question

How to minimize video / audio delay in live meeting?

  • April 25, 2007
  • 3 replies
  • 962 views
I am developing a virtual classroom application. In two way live communication the delay with video/audio between participants is about 5 seconds, which is totally unaccaptable.

Can it be improved with the client / server side coding or with improving / fine tuning the FMS or Windows server?

Server specs are:

FMS 2.04
Windows 2003 SP2
2.0 GHZ AMD Athlon 64 Processor 3200+
1Gig RAM
Plenty of disc space
It's a dedicated server located in Germany. The users who tested were based in the UK.

This problem could be a project killer if now solved :(
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    3 replies

    Anonymous
    April 26, 2007
    turbostas - What a coincidence.

    I just hit the forums for the same issue. I currently use a Helix server and I want to convert to FMS 2 for on line speech communication classes.

    However when I use the Flash media encoder I get the same 5 second delay in Live streaming.

    I have 8 Megs of available bandwidth and I am testing locally. There should be little or no lag. I opened a port and tested from home with the same scenario.


    I have a camera setup on a laptop using Flash media encoder - creating a live stream. Then I am simply using a swf to connect to it. The only thing I noticed is that the swf takes about 5-8 second to buffer before playing and I am unsure if it is the cause or not.

    Anyone come across this?

    I have tried every known setting and I get the same delay with these settings:

    12 FPS, 320X240, Bitrate 100
    25 fps, 320X240, bitrate 200
    60 fps, 320X240, bitrate 650

    I am open for suggestions?
    vladaman
    Participating Frequently
    May 4, 2007
    quote:
    Originally posted by: tampa77
    However when I use the Flash media encoder I get the same 5 second delay in Live streaming.


    Hello,
    I can confirm I have similar issue. Our delay is even more significant. When streaming with Flash Media Encoder the delay on client side is up to 15-20 seconds. This is not an issue with old Flash 8 codec. Buffer settings on client side is set to 0.5 second.


    Anonymous
    April 25, 2007
    I'm wondering if this is a client side bandwidth issue.

    What bitrate are you publishing your audio/video at? Let's say you have 5 particpants, each broadcasting a 300kbps stream. That means each client needs to have about 1.5mbps of available bandwidth to keep up.

    There's also network conditions between the client and the server to consider. What sort of ping times are you getting from the UK locations?
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