avfoundation

问题 In my application I have to play audio files stored on a web server. I'm using AVPlayer for it. I have all the play/pause controls and all delegates and observers there which work perfectly fine. On playing small audio files everything works great. When a long audio file is played it also starts playing fine but after some seconds the AVPlayer pauses the playing (most probably to buffer it). The issue is it doesn't resume on its own again. It keeps in a pause state and if I manually press the

问题 We add subtitles to a video recorded by the user, but the export by our AVAssetExportSession object fails non-deterministically: sometimes it works, and sometimes it doesn't. It's unclear even how to reproduce the error. We noticed the asset tracks seem to get lost during export. Before exporting, there are two tracks (one for audio, one for video) as expected. But checking the number of tracks for the same file URL in exportDidFinish shows 0 tracks. So something seems wrong with the export

问题 Set front-facing camera in Xcode. How can I do that? Set front-facing camera in Xcode. AVCaptureSession *session = [AVCaptureSession new]; if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) [session setSessionPreset:AVCaptureSessionPreset640x480]; else [session setSessionPreset:AVCaptureSessionPresetPhoto]; AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput

问题 I'm trying to get multiple sounds files to play on an AVAudioPlayer instance, however when one sound plays, the other stops. I can't get more than one sound to play at a time. Here is my code: import AVFoundation class GSAudio{ static var instance: GSAudio! var soundFileNameURL: NSURL = NSURL() var soundFileName = "" var soundPlay = AVAudioPlayer() func playSound (soundFile: String){ GSAudio.instance = self soundFileName = soundFile soundFileNameURL = NSURL(fileURLWithPath: NSBundle

问题 Is it possible to use the existing Apple system sounds in my own app? I would like to write a sample app in Swift that does the following steps: Read/Get a list of all available systemSounds on the device (I think they are located in /System/Library/Audio/UISounds/ ) show the list on the screen if I touch a list item, play these sound So its basically the same, like when you choose a new ringtone on your iPhone. I think some apps are using this sounds, or have they copied/bought it? Thanks

问题 I'm working on a custom video player for iOS using AVFoundation. The idea is to be able to switch to a different video with a gesture (tap, swipe, whatever). Right now the player is working flawlessly on simulator , but when I test it on an actual device, the view goes blank after 3 or 4 swipes. I've even created playback controls for my player, when the view goes blank, these controls load correctly but do nothing. Any ideas guys? This is the initialization for the player - (id

问题 I want to implement the following things, App is running a music or video (using MPMoviePlayerController ) in background. User double clicks the home button and go to the first screen showing playback controls (fast rewind, play or pause, fast forward buttons) User click fast rewind or fast forward button. Then app play previous or next music or video. For the 3rd step, I should know which button is clicked. (As I naturally know, the currently playing item is paused, stopped.. using

问题 I want to implement the following things, App is running a music or video (using MPMoviePlayerController ) in background. User double clicks the home button and go to the first screen showing playback controls (fast rewind, play or pause, fast forward buttons) User click fast rewind or fast forward button. Then app play previous or next music or video. For the 3rd step, I should know which button is clicked. (As I naturally know, the currently playing item is paused, stopped.. using

问题 I am working on Video based application in Swift3 . As per my requirement I have to merge Video and Audio AVAsset into one, adjust their volumes separately and save the final Video in iPhone Device gallery . This is working fine using below code: func mergeVideoAndMusicWithVolume(assetVideo: AVAsset, assetMusic: AVAsset, startAudioTime: Float64, volumeVideo: Float, volumeAudio: Float){ //To merging a video and a music and set it a volume let dirPaths = NSSearchPathForDirectoriesInDomains(

问题 I'm having some problems getting a UIIMage from a CVPixelBuffer. This is what I am trying: CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(imageDataSampleBuffer); CFDictionaryRef attachments = CMCopyDictionaryOfAttachments(kCFAllocatorDefault, imageDataSampleBuffer, kCMAttachmentMode_ShouldPropagate); CIImage *ciImage = [[CIImage alloc] initWithCVPixelBuffer:pixelBuffer options:(NSDictionary *)attachments]; if (attachments) CFRelease(attachments); size_t width =