Depends what device you are using as input to the projector and the capabilities of that device to output a large streaming file.
Safe-ish bet will be a high data rate H264 file.
I'll be using my laptop, and I can add more ram to it if necessary.
I don't know what you mean by high data rate H264. The preset for H264 is 3 gpp 640 x 480. Is that what you mean?
Look thru the long list of H264 presets for something that matches your Sequence /Source footgae setting eg 1080p
THen check the data rate is at least 10mbps.
OVer do the data rate and your laptop maynot cope.
Do some tests with a portion of your project.