How to record a "Ream Media" video stream?

Cousin of mine is getting married in Vegas tonight (surprise!) and I’m trying to record the stream to a local file, then convert that into video formats that humans actually use.

But what I’ve found on the net all seems a bit sketchy.

Anyone else been down this road or have something they can recommend?

For that, all the Best Men need to run a train on the bride; then get somebody to record it on video. Or something. I guess.

Honestly, I have not been down that road before. Unfortunately.