avfoundation

I'm trying to capture multiple photos on highest resolution(AVCaptureSessionPresetPhoto) on iPhone 5s. I tried using the following code: dispatch_semaphore_t sync = dispatch_semaphore_create(0); while( [self isBurstModeEnabled] == YES ) { [stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error) { if (imageSampleBuffer != NULL) { NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer]; NSString *videoThumbPath = [NSString stringWithFormat:@"%@/img%d.png",

I am trying to create a CMSampleBuffer Ref from the data and trying to feed it to AVAssetWriter. But asset writer is failing to create the movie from the data. Following is the code to create the CMSampleBufferRef. CVImageBufferRef cvimgRef = CMSampleBufferGetImageBuffer(sampleBuffer); CVPixelBufferLockBaseAddress(cvimgRef,0); uint8_t *buf=(uint8_t *)CVPixelBufferGetBaseAddress(cvimgRef); int width = 480; int height = 360; int bitmapBytesPerRow = width*4; int bitmapByteCount = bitmapBytesPerRow*height; CVPixelBufferRef pixelBufRef = NULL; CMSampleBufferRef newSampleBuffer = NULL;

Background QTKit (QuickTime Kit) is a Mac framework from the 10.3 days that got some layer additions in 10.5 like for example QTMovieLayer . One of the nice things with QTMovieLayer is that you can access the movie content using the regular content property on the layer and get a CAImageQueue object back. The nice thing with this is that you can create a bunch of regular CALayer s and set the image queue as their content and give all the layers their own part of the movie by setting the correct contentRect . This means that you can create something like the image below with only one movie

I have been struggling with adding text subtitles to videos for a while. I have added some links that I referred in detail, but they are not helping. In below code, I am trying to add a subtitle to a video. The output file path is as below: file:///var/mobile/Applications/03E49B29-1070-4541-B7CB-B1366732C179/Documents/output_movie.mov In addition, the input file was recorded with a call to UIPickerView in the same application, at temporary path below: file:///private/var/mobile/Applications/03E49B29-1070-4541-B7CB-B1366732C179/tmp/capture/capturedvideo.MOV The error I am getting is as follows,

I am trying to develop an iPhone app that processes/filters and records video. I have two sample apps that have aspects of what I need and am trying to combine them. AVCamDemo from the WWDC10 sample code package (Apple Developer ID required) This deals with capturing/recording video. Brad Larson's ColorTracking sample app referenced here This deals with live processing of video using OpenGL ES I get stuck when trying to combine the two. What I have been trying to do is to use AVCaptureVideoOutput and the AVCaptureVideoDataOutputSampleBufferProtocol to process/filter the video frames through

I am attempting to create multiple, serial writing sessions with AVAssetWriter. Once I've completed one successfully (after calling finishWriting) the status is set to 2 (AVAssetWriterStatusCompleted). Trying to create another session, I call startWriting, but I get the error: [AVAssetWriter startWriting] cannot call method when status is 2 Seems I cannot create a writing session unless I configure something. Do I have to recreate the AVAssetWriter again? I must be missing something, and the docs aren't helping. Thanks. After the writer has completed it is no longer usable. You must create a