The videos we've seen match up with what we've seen on the ground. They are all running a custom software we haven't seen elsewhere and don't seem to be traditional MANPADS in any way.

We know Iran is driving around bongo trucks with small SAM systems on the back that use passive IRST rather than radar. The missiles themselves have the capability to cruise in the air for some period of time searching for a target before kicking in the engine for a last, fast sprint to the target. Because they are electro-optical (and piloted by a human), even early-warning and flare deployments won't do very much against a skilled operator.