avcapturesession

问题 I have an application with AVCaptureSession which work correctly with previous iOS versions, but then I tried run it on device with ios8, application crashed sporadic. but the problem wasn't solved. Exception getting in "[session addInput:input];" . Please advice how to resolve. Please verify my below code and im getting error in [session addInput:input]; Printing description of error: Error Domain=AVFoundationErrorDomain Code=-11852 "Cannot use Back Camera" UserInfo=0x17c076e0

问题 I'm trying to recreate UIViewAnimationTransitionFlipFromRight (and left). My reason for doing so, as shown below, is to make changes to AVCaptureVideoPreviewLayer in the middle of the animation, when the layer is obstructed. UIViewAnimationTransitionFlipFromRight won't let me stop the animation half way, make session changes, and continue, so here is my best shot at it. While this works, it's just not the same as UIViewAnimationTransitionFlipFromRight. The layer starts to rotate, but more of

问题 I'm trying to recreate UIViewAnimationTransitionFlipFromRight (and left). My reason for doing so, as shown below, is to make changes to AVCaptureVideoPreviewLayer in the middle of the animation, when the layer is obstructed. UIViewAnimationTransitionFlipFromRight won't let me stop the animation half way, make session changes, and continue, so here is my best shot at it. While this works, it's just not the same as UIViewAnimationTransitionFlipFromRight. The layer starts to rotate, but more of

问题 I'm trying to recreate UIViewAnimationTransitionFlipFromRight (and left). My reason for doing so, as shown below, is to make changes to AVCaptureVideoPreviewLayer in the middle of the animation, when the layer is obstructed. UIViewAnimationTransitionFlipFromRight won't let me stop the animation half way, make session changes, and continue, so here is my best shot at it. While this works, it's just not the same as UIViewAnimationTransitionFlipFromRight. The layer starts to rotate, but more of

问题 I have an issue with the delegate method didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection of AVCaptureOutput . It stops getting called within a second or two when I'm adding the sampleBuffer to a CFArray . If I remove the CFArray code, the delegate method continues to get called so I have no idea why the CFArray code is causing it to stop. I'd appreciate any help. @property CFMutableArrayRef sampleBufferArray; - (void)captureOutput:

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 trying to throttle my video capture framerate for my application, as I have found that it is impacting VoiceOver performance. At the moment, it captures frames from the video camera, and then processes the frames using OpenGL routines as quickly as possible. I would like to set a specific framerate in the capture process. I was expecting to be able to do this by using videoMinFrameDuration or minFrameDuration, but this seems to make no difference to performance. Any ideas? NSArray

问题 I am trying to record video in my iPhone app using AVFoundation. But whenever I click the Record button app crashes with this message -[AVCaptureMovieFileOutput startRecordingToOutputFileURL:recordingDelegate:] - no active/enabled connections. I know same question asked in SO, but none of its answers helped me. My problem is the same code works with another application perfectly, and when I try using exactly same code in this app - crashes. But still photo capture is working fine. Adding my

问题 My team is developing a set of SDKs for barcode scanning, ID scanning and OCR. We use device's camera, specifically, AVCaptureSession , to obtain video frames on which we perform our processing. We're exploring new iOS 9 multitasking features Slide Over and Split View. Apple suggests opting out of these features for camera-centric apps, where using the entire screen for preview and capturing a moment quickly is a primary feature (reference). This is the approach the use in their sample app

问题 My team is developing a set of SDKs for barcode scanning, ID scanning and OCR. We use device's camera, specifically, AVCaptureSession , to obtain video frames on which we perform our processing. We're exploring new iOS 9 multitasking features Slide Over and Split View. Apple suggests opting out of these features for camera-centric apps, where using the entire screen for preview and capturing a moment quickly is a primary feature (reference). This is the approach the use in their sample app