avfoundation

问题 when i export a video asset via AVAssetExportSession the result file is in landspace mode. (file grabbed via itune->apps->file sharing->my app). how can i export the video asset in portrait mode (rotate it)? 回答1: The video coming from the iPhone capture device are always landscape orientated whatever the device orientation is when capturing. If you want to rotate your video, the 'simple' solution is to assign a transform to the video track of the exported session. Create 2 mutable tracks in

问题 I can record opus using AVAudioRecorder as following: let opusRecordingSettings = [AVFormatIDKey: kAudioFormatOpus, AVSampleRateKey: 16000.0, AVNumberOfChannelsKey: 1] as [String: Any] do { try audioRecordingSession.setCategory(.playAndRecord, mode: .default) try audioRecordingSession.setActive(true) audioRecorder = try AVAudioRecorder(url: fileUrl(), settings: opusRecordingSettings) audioRecorder.delegate = self audioRecorder.prepareToRecord() audioRecorder.record() } catch _ { } // ... ...

问题 Using the speech to text feature I can easily get one label to be spoken. But I want utterance2 to be joined to utterance. I want utterance to be spoken first then when it is finished for utterance2 to be spoken right after. let utterance = AVSpeechUtterance(string: dptext.text!) let utterance2 = AVSpeechUtterance(string: dptext2.text!) let synthesizer = AVSpeechSynthesizer() synthesizer.speak(utterance) 回答1: I think the simplest way to handle this situation is to combine the two string with

问题 I'm trying to generate sound with code below. Everthing is fine there is no error. But when I executed this code, there is no sound. How can I fix this problem ? By the way, I'm using this example : http://www.tmroyal.com/playing-sounds-in-swift-audioengine.html var ae:AVAudioEngine var player:AVAudioPlayerNode? var mixer:AVAudioMixerNode var buffer:AVAudioPCMBuffer ae = AVAudioEngine() player = AVAudioPlayerNode() mixer = ae.mainMixerNode; buffer = AVAudioPCMBuffer(pcmFormat: player!

问题 I am using the iPhone camera to capture live video and feeding the pixel buffer to a network that does some object recognition. Here is the relevant code: (I won't post the code for setting up the AVCaptureSession etc. as this is pretty standard.) - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection { CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); OSType

问题 I am using the iPhone camera to capture live video and feeding the pixel buffer to a network that does some object recognition. Here is the relevant code: (I won't post the code for setting up the AVCaptureSession etc. as this is pretty standard.) - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection { CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); OSType

问题 I am using the iPhone camera to capture live video and feeding the pixel buffer to a network that does some object recognition. Here is the relevant code: (I won't post the code for setting up the AVCaptureSession etc. as this is pretty standard.) - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection { CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); OSType

问题 I have a strange problem: I want to generate a new sound file out of two soundfiles and silence. sound1: 2 seconds long + silence: 2 seconds silence + sound2: 2 seconds long When I try the code below, I get a 6 seconds long soundfile with all the parts, but in a different order! The order is: sound1, sound2, silence I am not able to put this silence in the middle of this composition (also not at the beginning). Is this a typical behavior or do I something wrong? Here is the code for putting

问题 I have a strange problem: I want to generate a new sound file out of two soundfiles and silence. sound1: 2 seconds long + silence: 2 seconds silence + sound2: 2 seconds long When I try the code below, I get a 6 seconds long soundfile with all the parts, but in a different order! The order is: sound1, sound2, silence I am not able to put this silence in the middle of this composition (also not at the beginning). Is this a typical behavior or do I something wrong? Here is the code for putting

问题 I have this code that resizes a video from 1280 x 720 to 640 x 360 But i want a resize with no crop. Is there a way to do a full resize the don't crop ? Here's the code class func resizer(inputURL : NSURL , completion: (outPutURL : NSURL?) -> Void ){ let videoAsset = AVAsset(URL: inputURL) as AVAsset let clipVideoTrack = videoAsset.tracksWithMediaType(AVMediaTypeVideo).first! as AVAssetTrack let composition = AVMutableComposition() composition.addMutableTrackWithMediaType(AVMediaTypeVideo,