avfoundation

问题 Can someone point me to documentation that will help me get correct SPS and PPS values for iPhone. 回答1: Question is a bit unclear... Picture Parameter Set is described in the latest ITU-T release of the standard in chapter 7.3.2.2 Sequence Parameter Set is described in chapter 7.3.2.1. 回答2: You can encode a single frame to a file and then extract the sps and pps from that file. I have an example that shows how to do exactly that at http://www.gdcl.co.uk/2013/02/20/iOS-Video-Encoding.html 回答3:

问题 I am having trouble recording audio and displaying it in a tableview. I am able to record and immediately play it back, but the audio doesn't seem to actually be stored to the device permanently, so I am unable to call it from the tableview. The directory also seems to change each time the app is open. How can I correct my code for permanent save and recall when populating tableview rows? func record() { let audioSession:AVAudioSession = AVAudioSession.sharedInstance() if (audioSession

问题 I'm trying to remove the audio track from a MOV type video in my phone's library. I know I can mute the audio on playback, but I plan to upload user videos and it would just make sense to take the audio out and reduce file size. I've tried converting obj-c code from THIS ANSWER to swift, but I either messed up with conversion or it just doesn't take out the audio from the file. Any help would be greatly appreciated. 回答1: The top upvoted answer didn't work for me + I had issues with video

问题 I have a photo taking app that is using AVFoundation . Once an image is captured, I have 2 core graphics methods that I have to run in order to properly rotate and crop the image. When testing this using the typical AVFoundation setup for capturing camera photos with a session preset of AVCaptureSessionPresetPhoto , I was always receiving a ton of memory warnings and I spent 2 weeks trying to solve these and I finally gave up. I ended up ditching the typical

问题 I'm very new to Swift and Ios programming. I like to, as mentioned above, insert my own metadata to captured images before i save them to album. I'm trying to get this done with this code. The saved image does not contain my own metadata, but its generated metadata. Can anybody please tell me what I'm doing wrong? Or maybe isn't it possible to add own new metadata table to captured images? Thanks a lot for your help @IBAction func btnPressed(sender: UIButton) { capturePicture() } func

问题 I am using a private library which was made for live broadcasting from iPhone. In every time of recording each frame it call a delegate function void MyAQInputCallback(void *inUserData, AudioQueueRef inQueue, AudioQueueBufferRef inBuffer, const AudioTimeStamp *inStartTime, UInt32 inNumPackets, const AudioStreamPacketDescription *inPacketDesc); Now how I can append this inBuffer to my AVAssetWriterInput as usual: [self.audioWriterInput appendSampleBuffer:sampleBuffer]; I think maybe convert

问题 I have written this code to capture an image using the AVFoundation library in Swift: @IBAction func cameraButtonWasPressed(sender: AnyObject) { if let videoConnection = stillImageOutput.connectionWithMediaType(AVMediaTypeVideo){ stillImageOutput.captureStillImageAsynchronouslyFromConnection(videoConnection){ (imageSampleBuffer : CMSampleBuffer!, _) in let imageDataJpeg = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageSampleBuffer) var pickedImage: UIImage = UIImage(data:

问题 As the title mentioned. I search with Google and Stackoverflow, all resources are for UIImage converting, or convert NSImage FROM CVPixelBufferRef. Now what I want to do is convert JPEG raw data TO CVPixelBufferRef so that I could generate a movie file with live jpeg streams. 回答1: You can use the following method to convert from NSImage to CVPixelBufferRef : - (CVPixelBufferRef)newPixelBufferFromNSImage:(NSImage*)image { CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName

问题 I want to write a simple app that 'does something' when the sound level at the mic reaches a certain level, showing the audio input levels for extra credit cant find any examples in swift that get to this -- dont want to record, just monitor have been checking out the docs on the AVFoundation classes but cant get off the ground thanks 回答1: Let you can use below code : func initalizeRecorder () { do { try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayAndRecord) try

问题 My iOS6 and working code to set bluetooth as an output: // create and set up the audio session AVAudioSession* audioSession = [AVAudioSession sharedInstance]; [audioSession setCategory: AVAudioSessionCategoryPlayAndRecord error: nil]; [audioSession setActive: YES error: nil]; // set up for bluetooth microphone input UInt32 allowBluetoothInput = 1; OSStatus stat = 0; stat = AudioSessionSetProperty ( kAudioSessionProperty_OverrideCategoryEnableBluetoothInput, sizeof (allowBluetoothInput),