avassetwriter

i needs to create a video from the image selected. i have code it shoudl work but its giving error while appending buffer. This is how both type of images has been saved. -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)img editingInfo:(NSDictionary *)editInfo { // NSLog(@"Came From Here"); imgv.image = img; AppDelegate *app = (AppDelegate *)[[UIApplication sharedApplication] delegate]; app.imgmain = img; [self dismissModalViewControllerAnimated:YES]; RecordVoice *rec = [[RecordVoice alloc] initWithNibName:@"RecordVoice" bundle:nil]; rec

I need to hold some video frames from a captureSession in memory and write them to a file when 'something' happens. Similar to this solution , i use this code to put a frame into a NSMutableArray: - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection*)connection { //... CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); uint8 *baseAddress = (uint8*)CVPixelBufferGetBaseAddress(imageBuffer); NSData *rawFrame = [[NSData alloc] initWithBytes:(void*)baseAddress length:(height *

I'm writing some frames to video with AVAssetWriterInputPixelBufferAdaptor , and the behavior w.r.t. time isn't what I'd expect. If I write just one frame: [videoWriter startSessionAtSourceTime:kCMTimeZero]; [adaptor appendPixelBuffer:pxBuffer withPresentationTime:kCMTimeZero]; this gets me a video of length zero, which is what I expect. But if I go on to add a second frame: // 3000/600 = 5 sec, right? CMTime nextFrame = CMTimeMake(3000, 600); [adaptor appendPixelBuffer:pxBuffer withPresentationTime:nextFrame]; I get ten seconds of video, where I'm expecting five. What's going on here? Does