I mainly focus on audio installs but occacionally do video and lighting work. I worked for a number of years in corporate A/V, and also installed Home Theatre for quite some time before that, so I'm fairly familiar with video projection.
I've got an install in a middle school gym/auditorium and they just added a projector and screen to the mix. I plan to run a 5 wire RGBHV from a wall panel to the projector, but I want to make sure all my bases are covered so they're prepared for different sources. They will primarily be using a laptop, most likely supplied by teachers - no dedicated laptop, but I want to be prepared just in case they hook a DVD player into the mix. To keep it simple I plan to use a RGB/VGA adapter and just have a single VGA input on the wall. In the event that someone needs to connect a DVD player they can just use a RGB/VGA adapter on the output of the DVD player, correct?
Another curveball...what about BluRay? It is my understanding that it is only supported over HDMI due to DRM. How does that factor into long runs? Would HDMI baluns work, or would they not pass the DRM signal? Would it make more sense to have a VGA and HDMI input on the wall, and then use the projector's remote control to choose the correct input?