The only video codecs available with RMC7 DVR setup are WMV. How can I get it to see other codecs?

I've tried different WMV versions in the drop-down box. I've also tried different FPS's. I've tried different browser emulations (but they all appear to be IE, even though others were selected.).

Is it the video codec that is causing the playback to be so choppy?

How can I fix this?