avcapturesession

问题 This is mostly relevant for augmented reality type applications. Apple provides information on how to capture video frames (and save them as images if need be) with AVCaptureSession here: http://developer.apple.com/library/ios/#qa/qa2010/qa1702.html I know that it is possible to create an openGL texture out a captured video frame and then use that as a background in the openGL view over which to overlay other graphics. I am wondering if there are any alternatives to this method? The method

问题 Initial Context I am developping an augmented reality application location based and I need to get the field of view [FOV] (I just update the value when the orientation change, so I am looking for a method which can get this value when I call it) The goal is to make a "degree ruler" relevant to reality like the following: I am already using AVCaptureSession to display camera stream ; and a path coupled with a CAShapeLayer to draw the ruler. This is working pretty good, but now I have to use

问题 First I want to discuss the scenario happening in snapchat. In snapchat when you start recording video and song is running in background; It allows continue that song while recording video and after you record that video you can also able to hear that song in background. I am using SCRecorder for recording video and capture image with my custom layout . Now in that I want to do just like above scenario but problem is whenever I start recording the video in background song is stopped playing.

问题 I'm developping an app which requires capturing framebuffer at as much fps as possible. I've already figured out how to force iphone to capture at 60 fps but - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection method is being called only 15 times a second, which means that iPhone downgrades capture output to 15 fps. Has anybody faced such problem? Is there any possibility to increase

问题 So, I followed Apple's instructions to capture video session using AVCaptureSession : http://developer.apple.com/iphone/library/qa/qa2010/qa1702.html. One problem I'm facing is that even though the orientation of the camera / iPhone device is vertical (and the AVCaptureVideoPreviewLayer shows a vertical camera stream), the output image seems to be in the landscape mode. I checked the width and height of imageBuffer inside imageFromSampleBuffer: of the sample code, and I got 640px and 480px

问题 in Swift 2.3 I used this code to take a picture in custom camera: func didPressTakePhoto(){ if let videoConnection = stillImageOutput!.connection(withMediaType: AVMediaTypeVideo) { stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: { (sampleBuffer, error) -> Void in if sampleBuffer != nil { let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer) let dataProvider = CGDataProviderCreateWithCFData(imageData) let

问题 I am building a QR code scanner with Swift and everything works in that regard. The issue I have is that I am trying to make only a small area of the entire visible AVCaptureVideoPreviewLayer be able to scan QR codes. I have found out that in order to specify what area of the screen will be able to read/capture QR codes I would have to use a property of AVCaptureMetadataOutput called rectOfInterest . The trouble is when I assigned that to a CGRect, I couldn't scan anything. After doing more

问题 Hi I want to setup AV capture session to capture images with specific resolution (and, if possible, with specific quality) using iphone camera. here's setupping AV session code // Create and configure a capture session and start it running - (void)setupCaptureSession { NSError *error = nil; // Create the session self.captureSession = [[AVCaptureSession alloc] init]; // Configure the session to produce lower resolution video frames, if your // processing algorithm can cope. We'll specify

问题 Hi I want to setup AV capture session to capture images with specific resolution (and, if possible, with specific quality) using iphone camera. here's setupping AV session code // Create and configure a capture session and start it running - (void)setupCaptureSession { NSError *error = nil; // Create the session self.captureSession = [[AVCaptureSession alloc] init]; // Configure the session to produce lower resolution video frames, if your // processing algorithm can cope. We'll specify

问题 I have a UIViewController in which I use AVCaptureSession to show the camera and it is working just fine and fast. I placed a UIButton object on top of this camera view and added a IBAction for the button. This is how it looks like right now: Now I want to get the picture of the current camera view when the user taps the button: @IBAction func takePicture(sender: AnyObject) { // omg, what do do?! } I have no idea whatsoever on how I can do that. I imagined there could have been something like