I've recently been exploring the free version of DaVinci Resolve as an alternative to Premiere Pro for my main video editor on Windows 10. I was trying to edit some footage I shot on my iPhone 12 at 4K (3840 x 2160), 60 fps. However, when I imported the videos into DaVinci Resolve 17, it showed the video clips as "offline," yet the audio would still play back. This is because newer videos shot on iPhone commonly use the HEVC (High Efficiency Video Coding, or H.265) format. While macOS natively supports the HEVC/H.265 codec, it is not natively supported by Windows 10 or DaVinci Resolve out of the box.
I found several suggestions in forums suggesting that in order to get DaVinci Resolve and Windows to properly see videos shot on iPhone, you should re-encode them using another codec (like H.264, DNxHD). There were links to all sorts of shady video conversion tools published by untrusted developers. There were also recommendations to transcode the videos using FFmpeg or Handbrake--both acceptable alternatives. But, there's a simpler way and it only costs $0.99.In the Microsoft Store, there is a utility called HEVC Video Extensions. After installing this utility, Windows 10, and DaVinci Resolve will be able to read and encode HEVC/H.265 videos shot on iPhone without the need to convert to another format. Also, depending on your hardware, the codec may support hardware decoding, which will provide accelerated performance when editing in DaVinci Resolve on Windows 10. Hopefully that helps someone else out there looking for a simple, elegant solution to this issue.