字符串 像素（imageheight,imagewidth）
AVCaptureSessionPresetHigh 1920*1080
AVCaptureSessionPresetMedium 480*360
AVCaptureSessionPresetLow 192*144
AVCaptureSessionPresetPhoto 4032*3024
AVCaptureSessionPreset352x288 352*288
AVCaptureSessionPreset640x480 640*480
AVCaptureSessionPreset1280x720 1280*720
AVCaptureSessionPreset1920x1080 1920*1080
AVCaptureSessionPreset3840x2160 3840*2160
AVCaptureSessionPresetiFrame960x540 960*540
AVCaptureSessionPresetiFrame1280x720 1280*720
AVCaptureSessionPresetInputPriority 1920*1080
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