I think it is one common shield.
I don't have the cable in front of me at the moment. I am just brainstorming about a pair of cameras I mounted a while back. I did run a second cable up there just to fix the issue. But there still is that unused "audio" cable up there, and it'd be nice to run another camera through it someday, if I could figure out a cost-effective way to do it.
If I had it to do over again, I suppose I should have just run Cat5 and used baluns.
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