how to reduce the delay in a live stream?? - using encoder SDK, media server and silverlight player
Farooq Khan
i have a scenario, where live stream is little more engaging - the presenter
would run surveys along with the live camera feed or pop up quizes, sort of
thing. and this ofcourse needs to be very timely (perhaps not more than 2-3
seconds delayed). To do all that i have used Media Encoder SDK 9 to encode
the stream from camera, add the forms/quizes instructions and push them out
to my custom player (on silverlight) through Media Server 08.
But now when i run it, i experience a delay over the LAN of like 15-20
seconds which is really long. comparing this delay with other sites like
mogulus.com, this looks fairly huge and makes the whole idea impractical.
This delay is when i have already done following
- have setup encoder profile to just do 1 second buffer
- have disabled buffering on the publishing point on media server
- have set buffering time in the silverlight medialpayer to just 1 second
as i said, somehow still getting that 15-20 seconds delay. To see if it's
taking longer during the encode i had my encoding application show me the
PostView from my video source, directly (rather than through stream server),
which is almost instantaneous. I really need help on this. Following is some
related information
My encoding profile specs are
Frame size = 320 x 240
FPS = 20
Total Bit rate = 145kbps approx (100 video + 32 audio + 4 script + 8
overhead)
Video Codec = WMV 9
Audio Codec = WMA 9.2
The encoding machine is a 2.0 duo core 64 bit with 3 GB RAM laptop. Stream
server is a quad core 2.8 ghz 64 bit with 4 GB RAM.
Best regards,
Farooq Khan