4k video on a cell phone can good! By default 35mbps is too low for any motion to stay sharp. Most 4k cell phone video looks worse then full HD. Now you can hack your phone to more than triple the bitrate.
Too Smart Guys' Defcon 22's - T.D. Francis X-Hour Film Contest Entry
Pox and DrPwnsU saw film contest table at Defcon. They had to make a short sci fi film in less then 48 hours with no real budget. See what happen if you over power a Defcon badge.