Previously on random mutterings… as well as streaming with a deliberate 20% loss to an OBD, I’m using RIST to stream to AWS Media connect, same loss profile, same 1 second buffer. OBD can cope with 10 million packets and no loss. Can AWS Media connect? AWS statistics are lacking – they are a graph, […]
Monthly archives: July 2020
A quick look at RIST retransmits
In an effort to understand RIST retransmits a little better, I setup a single RIST stream of 20mbit (2,000 packets per second), with a 1 second RIST buffer – about 10 times round trip time, from an OBE into and OBD, and looked at the RTP traffic on the decoder. The ping time from the […]
When FEC can’t cope
When you are streaming low latency video (<1 second glass-glass), FEC is a great way of coping with a little packet loss along the way. In theory Pro-MPEG FEC can cope with upto 25% packet loss, but in practice it can struggle with 0.001% loss. FEC works in a similar way to RAID, it sends […]
Cisco Firepower, Traceroute, and “Unsupported CLI”
We have a couple of Cisco firepower firewalls inside our network, protecting certain circuits that arrive from buildings we don’t control One of the many major annoyances with them is their invisibility to traceroute. Paul Stewart’s blog post about enabling them (forcing them to decrement the TTL as packets travel through them) seems just what […]