All things related to multicast

[Scott Bertilson <>]

It has been years since we had some of these installed so my recollection is a bit vague.  I think the default configuration was a high bit rate and was also MJPEG vs something more reasonable like MPEG.  MJPEG only really makes sense for very fast motion which they didn't need.  In addition, with a few trials we were able to work with them to cut the bit rate down to a fraction of the default based on visual evaluation of the results of lowering the rate and using MPEG.

Hope this helps.

On Fri, Apr 28, 2017 at 1:40 PM, Fligor, Debbie <> wrote:

We’ve gotten stuck supporting SVSI multicast AV units, and they are breaking things all over the place.

http://svsiav.com/video-over-ip-products/encoders/

The vendor’s solution is that we should have a parallel physical network just to support AV on campus, and not mix the traffic with our real network, because they should only use “light compression” on their video.

They spew multicast packets so fast that they’ll overwhelm 1G uplinks between switches (we have plenty of smaller buildings that don’t actually need 10G links between the switches yet - or they didn’t)

It also appears that they need a unique multicast group address per video encoder.  We’ve been asked for 60 just for one building on campus that is putting in a video wall. With over 350 buildings on campus, that would use up a large part of 239.255.x.y just for this one application.

If anyone has ideas on how to get them using SSM, or has successfully gotten them to play nice on their data network, any info is appreciated.

Ideas for convincing the vendor to use modern multicast and encoding/compression are welcome as well!


Thanks,

--
-debbie
Debbie Fligor, n9dn       Lead Network Engineer @ Univ. of Il
email: