avfoundation

Is there a way to change the rate at which frames are rendered during playback? I have a couple short 5 second videos that I would like to play at 15, 30, or 60 FPS. This would be an option to the user. I did find a frameDuration property in the AVVideoComposition class. But all this did was adjust how many frames rendered per second. Jean Fabre Similar question here There is a rate property in the AVPlayer. It worked very well from me. Tho the rate values ranges from 0 to 2, 1 being played at normal speed, so to give the option to the suer to play at pre defined framerate would required some

I have been scratching my head since long now but not getting around to this. I haven't found a single example for Audio editing! I want to insert new Audio file in between somewhere in original Audio file, save it as new converted audio files. For this I have written following code. I got this idea from here . NSString *file1 = [[NSBundle mainBundle] pathForResource:@"file1" ofType:@"caf"]; // Using PCM format NSString *file2 = [[NSBundle mainBundle] pathForResource:@"file2" ofType:@"caf"]; NSData *file1Data = [[NSData alloc] initWithContentsOfFile:file1]; NSData *file2Data = [[NSData alloc]

I have a video capturing app and I want to be able to play background music while recording audio+video. I can accomplish this if I set the AVAudioSession category to PlayAndRecord in didFinishLaunchingWithOptions . However, this causes a glitch in the audio whenever the view with the camera enters or exits the foreground, and its apparently impossible to get rid of: https://forums.developer.apple.com/message/74778#74778 I can live with the glitch if it just happens when I start/stop recording video, but that means I need to change the AVAudioSession category from Ambient to PlayAndRecord when

I want to send microphone audio data over Multipeer Connectivity (iOS 8) and play it through the speaker of the receiving peer. I've also setup the AVAudioEngine and I can hear the microphone data from the (upper) speaker output, but I don't know how to send AVAudioPCMBuffer over the network. Here's my code snippet: AVAudioInputNode *inputNode =[self.engine inputNode]; AVAudioMixerNode *mainMixer = [self.engine mainMixerNode]; [self.engine connect:inputNode to:mainMixer format:[inputNode inputFormatForBus:0]]; [mainMixer installTapOnBus:0 bufferSize:4096 format:[mainMixer outputFormatForBus:0]

After applying an AVVideoComposition to my AVPlayerItem , the filter I apply does work, but the video gets rotated in the AVPlayerLayer . I know for a fact that the problem is not with the filtered frame because if I show the frame in a UIImageView , the frame is rendered 100% correctly. The video shows correctly until I apply a videoComposition . Setting the videoGravity on the AVPlayerLayer does not help. The video gets rotated 90º clockwise and gets stretched in the layer. Essentially, the video is displayed perfectly in the AVPlayerLayer before the AVPlayerItem is fed through the

Is AVAssetWriterInput's readyForMoreMediaData updated in a background thread? If readyForMoreMediaData is NO, can I block in the main thread and wait until the value changes to YES? I'm using an AVAssetWriterInput by pushing data to it (i.e. without using requestMediaDataWhenReadyOnQueue) and I've set expectsMediaDataInRealTime, and 99.9% of the time I can just call appendSampleBuffer (or appendPixelBuffer) on it as fast as my app can generate frames. This works fine unless you put the device (iPhone 3GS) to sleep for 15 minutes or so in the middle of an AVAssetWriter session. After waking up

I need to create something like an infinite loop in my AVQueuePlayer . Especially, I want to replay the whole NSArray of AVPlayerItem s once the last component finishes playing. I must admit that I actually do not have any idea how to achieve this and hope you can give me some clues. best way to loop a sequence of videos in AVQueuePlayer. observe for each playeritem in AVQueuePlayer. queuePlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone; for(AVPlayerItem *item in items) { [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(nextVideo:) name