qtkit

问题 I'm trying to use cocoa to grab images from a webcam. I'm able to get the image in RGBA format using the QTKit and the didOutputVideoFrame delegate call, and converting the CVImageBuffer to a CIImage and then to a NSBitmapImageRep. I know my camera grabs natively in YUV, what I want is to get the YUV data directly from the CVImageBuffer, and proccess the YUV frame before displaying it. My question is: How can I get the YUV data from the CVImageBuffer? thanks. 回答1: You might be able to create

问题 just simple peace of code (file 1.mp3 clicked and playing as well in iTunes) : - (void)applicationDidFinishLaunching:(NSNotification *)aNotification { NSError *outError = nil; QTMovie *newMovie = [QTMovie movieWithURL:[NSURL URLWithString:@"/Users/Alex/1.mp3"] error:&outError]; if (newMovie) { //[newMovie setAttribute:[NSNumber numberWithBool:YES] forKey:QTMovieEditableAttribute]; [self setMovie:newMovie]; } [movie play]; give me error Error Domain=NSOSStatusErrorDomain Code=-2000 UserInfo

问题 I need to get video frames from ip camera using RTSP. To get rtsp stream I use live555. The problem is that I can't find a way to decode incoming video frames with AVFoundation. (I can't use ffmpeg). Is there a way to use AVFoundation for video decoding. If yes then how to do it? 来源： https://stackoverflow.com/questions/17585369/get-rtsp-stream-from-live555-and-decode-with-avfoundation

问题 I'm new with the whole QTKit and I was looking for some feedback on the following code that I am attempting to use to display the camera's image and record movies. - (void)initializeMovie { NSLog(@"Hi!"); QTCaptureSession* mainSession = [[QTCaptureSession alloc] init]; QTCaptureDevice* deviceVideo = [QTCaptureDevice defaultInputDeviceWithMediaType:@"QTMediaTypeVideo"]; QTCaptureDevice* deviceAudio = [QTCaptureDevice defaultInputDeviceWithMediaType:@"QTMediaTypeSound"]; NSError* error;

问题 Does anyone know the correct way to replace old QTMovieCurrentSizeAttribute and QTMovieSizeDidChangeNotification tasks? I'm trying to clean out old deprecated code. I've found that QTMovieNaturalSizeDidChangeNotification is not a replacement for QTMovieSizeDidChangeNotification . Likewise QTMovieNaturalSizeAttribute is not a replacement for QTMovieCurrentSizeAttribute . Natural Size refers to the QTMovie 's native resolution, while Current Size refer to the resolution at which a QTMovie is

问题 Currently I have the following CIImage *img = [CIImage imageWithCVImageBuffer: imageBuffer]; NSCIImageRep *imageRep = [NSCIImageRep imageRepWithCIImage:img]; NSImage *image = [[[NSImage alloc] initWithSize: [imageRep size]] autorelease]; [image addRepresentation:imageRep]; This works perfectly, I can use the NSImage and when written to a file the image is exactly how I need it to be. However, I'm pulling this image from the users iSight using QTKit, so I need to be able to flip this image

问题 I have the following PyObjC script: from Foundation import NSObject import QTKit error = None capture_session = QTKit.QTCaptureSession.alloc().init() print 'capture_session', capture_session device = QTKit.QTCaptureDevice.defaultInputDeviceWithMediaType_(QTKit.QTMediaTypeVideo) print 'device', device, type(device) success = device.open_(error) print 'device open success', success, error if not success: raise Exception(error) capture_device_input = QTKit.QTCaptureDeviceInput.alloc()

问题 When I call setDelegate_ within my pyObjC code I get an AttributeError: 'tuple' object has no attribute 'setDelegate_' . My Code looks like this: def createMovie(self): attribs = NSMutableDictionary.dictionary() attribs['QTMovieFileNameAttribute'] = '<My Filename>' movie = QTMovie.alloc().initWithAttributes_error_(attribs, objc.nil) movie.setDelegate_(self) Edit I Found out that i can't use any instance methods with the movie object. 回答1: From your comment, it looks like QTMovie.alloc()

问题 I've been playing with QTKit for a couple of days and I'm successfully able to record video data to a file from the camera using a QTCaptureSession and QTCaptureDeviceInput etc. However what I want to do is send the data to another location, either over the network or to a different object within the same app (it doesn't matter) and then play the video data as if it were a stream. I have a QTCaptureMovieFileOutput and I am passing nil as the file URL so that it doesn't actually record the

问题 It looks like using core audio to record audio is overly complicated. While QTkit is basic and down to earth However. All of the examples I have see integrate video and audio together. Does some one have or know an example of using QTkit for recording audio? 回答1: Here is an example of using QTKit for recording audio. 回答2: In order to capture audio only, you have to either select the default device that supports sounds, or disable video connection on muxed devices. // Get the default sound