According to Apple, ProRes video recording is limited to 1080p quality at 30 frames per second on the 128GB model of the iPhone 15 Pro, unless the device records directly to a connected external storage drive. On the 256GB and higher iPhone 15 Pro and iPhone 15 Pro Max, ProRes video recording is supported in both internal storage and external storage at up to 4K quality at 60 frames per second.

iPhone 15 Pro lineup
Apple didn’t mention this information on the iPhone 15 Pro’s tech specs page on its website, but as seen in the screenshot below, the Apple Store app lists the limitations when comparing the iPhone 15 Pro to another iPhone model.

iPhone 15 Pro 128GB ProRes
The same limitation applies to iPhone 13 Pro and iPhone 14 Pro models with 128GB of storage, but those devices can’t record ProRes video to external storage, so at least iPhone 15 Pro users have that option for now. The limit does not apply to the iPhone 15 Pro Max, as that model starts with 256GB of storage.

ProRes video files are very large. Apple says that one minute of 10-bit ProRes video is approximately 1.7GB in 1080p and 6GB in 4K. Apple feels that offering 4K ProRes video recording to internal storage on the 128GB model would be a subpar user experience. This is less of an issue as recording to external storage is now an option.

Introduced on the iPhone 13 Pro models, ProRes refers to a family of codecs from Apple that can compress video to smaller file sizes with “effective image quality preservation.” Apple says ProRes is designed as the ultimate delivery format for high-quality video such as commercials, feature films and broadcasts.

ProRes video recording is not yet supported at all on the standard iPhone 15 and iPhone 15 Plus.

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