avfoundation

I am using AvFoundation to take still image and adding gps info to metadata and saving to a photo album using Asset library but gps info is not saving at all. here is my code... [self.stillImageTaker captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) { if (imageDataSampleBuffer != NULL) { CFDictionaryRef exifAttachments = CMGetAttachment(imageDataSampleBuffer,kCGImagePropertyExifDictionary, NULL); CFDictionaryRef metadataDict = CMCopyDictionaryOfAttachments(NULL, imageDataSampleBuffer, kCMAttachmentMode

I am trying to crop an already taken video into a circle in iOS. How might I go about doing this. I know how I would do it with AVCaptureSession but I don't know to pass in an already taken video as an AVCaptureDevice? Is there a way to crop a video into a circle. I want to overlay it on top of another video so it has to have a transparent background as well. Thanks. I guess you want to produce something like this: You don't want an AVCaptureSession , because you're not capturing video. You want an AVMutableComposition . You need to read the “Editing” section of the AV Foundation Programming

I try to save the sample buffer instead of an UIImage to an array, to convert it later on. This to speed up the image capturing and maybe not get memory warnings. I just can't figure out how to save it to the array and then use it again to call [self imageFromSampleBuffer:sampleBuffer]. I tried something like this, but how do I convert the data back to a CMSampleBufferRef object? - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection { // Create a UIImage from the sample buffer data //

I am writing an iPhone app which takes video from the camera, runs it through some OpenGL shader code and then writes the output to a video file using AVFoundation . The app runs in lanscape orientation (either) and therefore all video recorded should be landscape. The current code I use before starting recording to get the video the right way round is: [[self videoWriterInput] setTransform:CGAffineTransformScale(CGAffineTransformMakeRotation(M_PI), -1.0, 1.0)]; where videoWriterInput is an instance of AVAssetWriterInput and the aim is to compensate for the landscape mode and the reveresed

I want to "stream" the preview layer to my server, however, I only want specific frames to be sent. Basically, I want to take a snapshot of the AVCaptureVideoPreviewLayer, scale it down to 28*28, turn it into an intensity array, and send it to my socket layer where my python backend handles the rest. Problem here is that AVCapturePhotoOutput's capture function is insanely slow. I can't repeatedly call the function. Not to mention it always makes a camera shutter sound haha. The other problem is that taking a snapshot of AVCaptureVideoPreviewLayer is really difficult. Using

I'm playing with the AVEditDemo project, from Apple's WWDC 2010 sample pack, and I'm trying to change the frame rate of the exported video. The video is exported using an AVMutableComposition on which the frameDuration is set like that: videoComposition.frameDuration = CMTimeMake(1, 30); // 30 fps For some reason, changing the 30 to 25 does not change the framerate of the video exported with the AVAssetExportSession . Does anyone have an idea why? MonsieurDart It seems that the AVAssetExportSession preset takes precedence over the AVVideoComposition frameDuration . I've opened a bug report: