According to Apple’s technical specifications, the new iPhone 15, iPhone 15 Plus, iPhone 15 Pro and iPhone 15 Pro Max all support DisplayPort, which can achieve 4KHDR video mirroring and output video to an external monitor or TV.
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All iPhone1 5 models have built-in DisplayPort support in their USB-C ports, which means these devices can natively output video at 4K/60Hz to an external DisplayPort-equipped monitor or TV using a supported USB-C to DisplayPort cable.
In addition, users can also use Apple’s $69 USB-C Digital Audio and Video Multi-Port Adapter to mirror any iPhone 15 video to an HDMI-equipped TV or monitor at 4K/60Hz, but this method does not support HDR.
On older iPhones with Lightning ports, video mirroring using Apple's Lightning-to-HDMI or Lightning-to-VGA adapters can only go up to 1080p.
Unfortunately, for those who prefer to use the "StageManager" feature on certain iPad models, the iPhone does not yet offer an extended display mode.
In addition, the iOS17ReleaseCandidate version released by Apple yesterday contains code that reveals new requirements for recording ProRes video directly to external storage using iPhone15Pro.
At yesterday’s press conference, Apple said that the iPhone 15 Pro can record ProRes4K video to external storage at 60fps with the help of the new USB-C port. The code shows that ProRes2.8K at 60fps is also supported when recording to external storage devices. This is a major improvement compared to the iPhone 14 Pro, which only supports ProRes 2.8K and 4K at 30fps, and does not allow direct recording to storage devices. In addition, according to the code, the external storage device must be formatted as exFAT or APFS to use the feature, but it does not specify whether there is a disk speed requirement.
ProRes is a high-quality video codec often used by professional filmmakers. Video recorded in ProRes format takes up a lot of storage space. Recording 4K60fps ProRes video is a feature Apple has only added based on the new A17Pro chip and the option to connect an external storage drive.