avfoundation

Every file I write with AVAssetWriter has a black background, if the images I include do not fill the entire render area. Is there any way to write with transparency? Here's the method I use to get the pixel buffer: - (CVPixelBufferRef)pixelBufferFromCGImage:(CGImageRef)image { CGSize size = self.renderSize; NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey, [NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey, nil]; CVPixelBufferRef pxbuffer = NULL; CVPixelBufferPoolCreatePixelBuffer

Hi I am trying to record video with overlay. I have written: -(void)addOvelayViewToVideo:(NSURL *)videoURL to add overlay view on recorded video but it is not working. I written the code to record video in viewDidLoad using AVCaptureSession . //In ViewDidLoad //CONFIGURE DISPLAY OUTPUT self.previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession]; [self.previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill]; self.previewLayer.frame = self.view.frame; [self.view.layer addSublayer:self.previewLayer]; -(void)captureOutput:(AVCaptureFileOutput *)captureOutput

I’m writing a library to export assets to a file using AVFoundation. I create a reader, a writer, connect the inputs and outputs to these and then call the requestMediaDataWhenReadyOnQueue method on the inputs to start pulling the data. The block callback supplied to this method looks a bit like this: [input requestMediaDataWhenReadyOnQueue:queue usingBlock:^{ while ([input isReadyForMoreMediaData]) { CMSampleBufferRef buffer; // The track has some more data for us if ([reader status] == AVAssetReaderStatusReading && (buffer = [output copyNextSampleBuffer])) { BOOL result = [input

I'm getting a UIImage from a CMSampleBufferRef video buffer every N video frames like: - (void)imageFromVideoBuffer:(void(^)(UIImage* image))completion { CMSampleBufferRef sampleBuffer = _myLastSampleBuffer; if (sampleBuffer != nil) { CFRetain(sampleBuffer); CIImage *ciImage = [CIImage imageWithCVPixelBuffer:CMSampleBufferGetImageBuffer(sampleBuffer)]; _lastAppendedVideoBuffer.sampleBuffer = nil; if (_context == nil) { _context = [CIContext contextWithOptions:nil]; } CVPixelBufferRef buffer = CMSampleBufferGetImageBuffer(sampleBuffer); CGImageRef cgImage = [_context createCGImage:ciImage

I am trying to get AVPlayer to play a m3u8 playlist that is a local file. I have narrowed this down to a simple test case using one of Apple's sample playlists: https://tungsten.aaplimg.com/VOD/bipbop_adv_fmp4_example/master.m3u8 If i play this playlist from the remote url, AVPlayer plays this fine. However, if i download this playlist to a local file, and then hand AVPlayer the local file URL, AVPlayer will not play it. It just shows the crossed out play symbol. Interestingly enough, this can be duplicated with Safari as well. Safari will play the remote playlist but not the local file. Also