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AVCaptureMultiCamSession: the real limits, and why the stock Camera app doesn't offer dual recording

Modern iPhones can genuinely run the front and back cameras at the same time. AVCaptureMultiCamSession has been in the SDK since iOS 13 and works on…

ios swift avfoundation metal

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[iOS] Why Passthrough MP4 Export Failed for iPhone Videos

A user picks a video from Photos. The app turns that video into a file the server can accept. Then it uploads the file. On the surface, this sounds…

ios swift avfoundation debugging