What? How? Ben Mayo:
The multi-cam recording relies on new API introduced in iOS 13. At the WWDC session on the subject, Apple stressed that this required significant reworking of the hardware pipeline of their devices, but that the necessary changes have been made in the iPhone XS, iPhone XR, and the new iPad Pro models.
Stunning demo of FiLMic Pro recording multiple streams of video from the new iPhone 11 Pro’s four cameras.