avcapture

问题 I'm using AVCapture to create my own camera on iOS. When I click the button to take a photo. I capture the image from the preview layer. Then I assign the captured image to a imageview that I make the size of the screen and place it on top of the preview layer. The problem is the captured image has different proportions to what the ios video camera preview has, so when you click to capture a photo.. You can see the aspect of the photo change. I want the photo to look identical to the preview.

问题 I'm using AVCaptureDevice.setTorchModeOn(level) method to turn on the flashlight at variable brightness. On my old iPhone SE it's working fine — I can clearly see 4 different brightness levels as I change level from 0 to 1 . But on the iPhone 11 Pro the flashlight turns on only when level is 1.0 ! And it's brightness if far from maximum level (compared to flashlight from Control Center). I tried using maxAvailableTorchLevel constant, but results are the same as using 1.0 . Also tried values

问题 I'm making an app to record videos at the device maximum frame rate (i.e., 120fps in the iPhone 5s and 240 in the 6 and 6s). I've managed to configure the AVCaptureDevice to set the maxFrameRateDuration , I print to the logs the currentDevice.activeFormat.videoSupportedFrameRateRanges and everything works great. But when I attempt to save the video, it does save it, but at normal frame rate, not at 120 or 240fps. Please, can anyone help me with this? Any help would be much appreciated. Thanks

问题 I want to set the lens distance of my iPhoneX to a constant. In order to check if that is supported, I check the isLockingFocusWithCustomLensPositionSupported property of my device, as described in the documentation here: https://developer.apple.com/documentation/avfoundation/avcapturedevice/2361529-islockingfocuswithcustomlensposi The method always returns false, even when the device is locked for configuration, which means that calling the method setFocusModeLocked(lensPosition,

问题 I want to set the lens distance of my iPhoneX to a constant. In order to check if that is supported, I check the isLockingFocusWithCustomLensPositionSupported property of my device, as described in the documentation here: https://developer.apple.com/documentation/avfoundation/avcapturedevice/2361529-islockingfocuswithcustomlensposi The method always returns false, even when the device is locked for configuration, which means that calling the method setFocusModeLocked(lensPosition,

问题 I want to set the lens distance of my iPhoneX to a constant. In order to check if that is supported, I check the isLockingFocusWithCustomLensPositionSupported property of my device, as described in the documentation here: https://developer.apple.com/documentation/avfoundation/avcapturedevice/2361529-islockingfocuswithcustomlensposi The method always returns false, even when the device is locked for configuration, which means that calling the method setFocusModeLocked(lensPosition,

问题 I want to display the stream of the front and the back facing camera of an iPad2 in two UIViews next to each other. To stream the image of one device I use the following code AVCaptureDeviceInput *captureInputFront = [AVCaptureDeviceInput deviceInputWithDevice:[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo] error:nil]; AVCaptureSession *session = [[AVCaptureSession alloc] init]; session addInput:captureInputFront]; session setSessionPreset:AVCaptureSessionPresetMedium]; session

问题 I want to display the stream of the front and the back facing camera of an iPad2 in two UIViews next to each other. To stream the image of one device I use the following code AVCaptureDeviceInput *captureInputFront = [AVCaptureDeviceInput deviceInputWithDevice:[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo] error:nil]; AVCaptureSession *session = [[AVCaptureSession alloc] init]; session addInput:captureInputFront]; session setSessionPreset:AVCaptureSessionPresetMedium]; session

问题 I am trying to find the accepted formats on an AVFoundation output: self.theOutput=[[AVCaptureVideoDataOutput alloc]init]; if ([self.theSession canAddOutput:self.theOutput]) [self.theSession addOutput:self.theOutput]; I am then inserting a breakpoint right after and: po [self.theOutput availableVideoCVPixelFormatTypes] and I get this: (NSArray *) $5 = 0x2087ad00 <__NSArrayM 0x2087ad00>( 875704438, 875704422, 1111970369 ) How do I get the string values of these format types? Thanks 回答1: On an

问题 I am capturing images from the camera using captureStillImageAsynchronouslyFromConnection The images are being saved upside down. I tried saving the image using UIImage *flippedImage = [UIImage imageWithCGImage:image.CGImage scale:image.scale orientation:UIImageOrientationUp] but this orientation is only in the metadata and when I copy the data from the file to process it the processed images are upside down. (Quick look shows the originals upright, but the processed/filtered images are