4k , the time length wieghts heavy on the mobile device. Averaging 4 +GB per 6mins. There really is only a couple phones out on the market that can even run video in true 4K .
Example the newest and greatest galaxy, a curved screen ,waterproof, unbelievable shock proof..... says it run 4K ,but the 10-minute Max ( ding ding ding) videos , with a high level of megapixels aren't exactly true 4K. Close but that only counts in hand grenades throwing in horseshoes. Ha