My goal is to play live(not pre-recorded) video streams from services such as Ustream and LiveStream.

For example:
http://www.ustream.tv/explorePuffinBurrow

I'd like to ask what is the general method for getting a playable url, and playing it in vMix?

With said stream I've tried the following without success:
- http://www.ustream.tv/explorePuffinBurrow

- rtmp://ustreamlivefs.fplive.net/ustream4live-live/ playpath=stream_live_1_1_9049687 swfUrl=http://static-cdn1.ustream.tv/swf/live/viewer.rsl:96.swf swfVfy=1 live=1

-rtmp://flash52.ustream.tv:1935/ustreamCdn/flash84/12526746

I'm not concerned which steaming protocol is used to retrieve the video streams.

My specific use case is broadcasting a single live event, across multiple-distant sites - with each site re-displaying the event, mixed with other video and graphics.

Thx