Other question: If my footage is a 720p, what is gonna happen when I export it at 1080? I'm gonna loose some quality right??
Some is an understatement. Better downscale 1080 to 720. Always much better than upscaling. As to the framerate, with some 30P and some 60P, you will be better off with 30P altogether.
ok, but then if I choose the 30fps sequence, my footages of 60fps won't be super fluid, especially if I want to do a slow motion
Do your slomos in a 60p sequence and nest it in a 30p sequence.
thanks for your advice,
but I tried it (nest a 60fms sequence into a 30fps) and honestly I don't see a difference between the nested sequence and the same footage that I put directly into the 30 fps sequence, I did a slowmo with both.
I watched it several times and don't see any difference
Maybe premiere pro adapt the 30fps sequence to let the 60fps footage at the original frame rate