HOW TO SHOOT 4K ON YOUR SMARTPHONE
So why would you want to record content in 4K if you don’t have a device to play it on? Read on.
The actual process of shooting in 4K resolution is fairly simple. While it differs from phone to phone, generally you just access the camera app, select video, and then change the resolution to 4K. It is worth noting, however, that a few smartphones limit what options are available when recording in 4K. For example, both the Samsung Galaxy S5 and Note 3 deactivate image stabilization (as well as HDR) when shooting in 4K.
The biggest limitation of recording in 4K affects every smartphone: none of them can record in 4K for more than five minutes at a time. This is due to how Qualcomm’s Snapdragon 800/801 chip processes 4K video data. Both Snapdragon 800/801 chips utilize software-based HVEC (H.265) encoding/decoding, rather than a hardware-based solution like those found in dedicated 4K video cameras. This means that all the heavy lifting while recording videos has to be done by the CPU itself, which puts it under heavy load. In turn, this leads to the processor overheating within just a few minutes of use, resulting in the phone shutting down the camera app to prevent the CPU from frying itself.