So what's going to happen if I connect two SDI outputs together? Say something as simple as connecting a video router output port to another output port on the same router? My gut says it's a bad idea but I can't say why. I know why you don't connect audio outputs together, I just don't know if the same principal applies to video outputs. Probably does.
The reason I'm asking is I've got a video patchbay with normaled modules in it and I'd like a couple of the modules to be straight-through but I'm having trouble sourcing the straight through modules. So, if it won't damage anything or cause problems I can just connect a couple router outputs to each side of a module. Inserting a patch cable to actually patch them into something will break the normal and then the signal flows just like you'd like it to. Can't add another patchbay, no space in the rack.
So, like I said, probably a bad idea, but why? I'm not going to actually do it (on purpose) unless someone knowledgeable on this sort of thing can tell me that it actually is ok.