[Live-devel] It works!!!But multicasting performance not good.

Mike Yan mikey at tlcwatch.com
Wed Apr 28 18:41:40 PDT 2004

I am using the wired lan which have 100M bandwidth. Maybe the router doesn't
support multicast well, but we did try to multicast video use other program
over our network, the quality of video is okay.
I just want to know if someone did the test for both multicast and unicast
and got same quality results -- I mean good quality.
Meantime, I may try to use one switch to multicast without the router.
Thanks for your help.

>Thank for your help. I am finally able to multicast and unicast the *.mpg
>files (mpeg 1 format) by using testMPEG1or2VideoStreamer and
>testMPEG1or2AudioVideoStreamer programs.
>Here is something I found. When I do the unicasting, the video running
>smoothly, but if I do the multicasting, the video is not smooth, kind of
>jerking a lot. I am wondering whether it's my problem for missing some
>settings. And how to make the streaming smooth when doing multicast.

What kind of network are you using?  For some networks - most notable 
802.11 wireless LANs - multicast traffic can end up getting less bandwidth 
than unicast (because, in 802.11, multicast traffic gets sent at the lowest 
supported bitrate, unless the nodes are configured to do otherwise).  Or, 
if you're using a wired LAN, then perhaps your router(s) aren't handling 
multicast properly.

Apart from this, I don't know what to suggest.  Because as far as the 
sender and receiver applications are concerned, RTP packets behave the same 
way regardless of whether they're unicast or multicast.

	Ross Finlayson

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