4 ms·
My memory is a bit hazy on this one - but I used to run the engineering team for a company that did multicast based IPTV for hotels about ~2003 or so and I'm pr
by arethuza 4y ago
My memory is a bit hazy on this one - but I used to run the engineering team for a company that did multicast based IPTV for hotels about ~2003 or so and I'm pretty sure the set top boxes used IGMP to control what video streams were sent to them - all devices on the fibre backbone got all the streams but each device in the rooms (connected by copper) could only handle a single stream.
So multicast doesn't necessarily mean that every device gets every packet... I think.
Also probably not worth using IGMP for audio.... :-)
- bobdvb 4y agoIt's often UDP/RTP delivery with SAP/SDP for announcement/discovery, then you use an IGMP join to attach to the stream. The important thing about why you'd use IGMP Multicast instead of unicast is that you get a more assured latency which is important for audio sync.