avfoundation

问题 I was able to assemble a minimal Swift demo of screen recording for debugging another thing but something struct me - AVFoundation never calls my delegate for recording. None of them in fact. The code is pretty straight forward: class ExampleRecorder: NSObject, AVCaptureFileOutputRecordingDelegate { private var session: AVCaptureSession?; private var fileOut: AVCaptureMovieFileOutput?; func fileOutput(_ output: AVCaptureFileOutput, didFinishRecordingTo outputFileURL: URL, from connections:

问题 I'm getting the depth data from the TrueDepth camera, and converting it to a grayscale image. (I realize I could pass the AVDepthData to a CIImage constructor, however, for testing purposes, I want to make sure my array is populated correctly, therefore manually constructing an image would ensure that is the case.) I notice that when I try to convert the grayscale image, I get weird results. Namely, the image appears in the top half, and the bottom half is distorted (sometimes showing the

问题 I have been trying for a while now how to stream real time audio from Data provided from a URLSessionDataTask in iOS. I have declared a custom class for managing the player actions and it looks like this: import UIKit import AVFoundation class AudioDataPlayer: NSObject { //MARK:- Variables //MARK: Constants enum Status{ case playing case notPlaying } let audioPlayerQueue = DispatchQueue(label: "audioPlayerQueue", qos: DispatchQoS.userInteractive) //MARK: Vars private (set) var currentStatus

问题 I am trying to add text overlay on video, When recording in iPhone 5s or lower devices in High quality and writing text on that then after 1 or 2 seconds audio goes missing, But this doesn't happen on larger devices like iPhone 6/6s. If i remove that text writer method then it works properly on all devices or if i reduce the video quality in 5s then also it works fine. How i can get video with audio in iPhone 5s with overlay text. Here is my code import Foundation import AVFoundation import

问题 Im instanciating the AVPlayerItemVideoOutput like so: let videoOutput = AVPlayerItemVideoOutput(pixelBufferAttributes: [String(kCVPixelBufferPixelFormatTypeKey): NSNumber(value: kCVPixelFormatType_32BGRA)]) And retrieving the pixelBuffers like this: @objc func displayLinkDidRefresh(link: CADisplayLink) { let itemTime = videoOutput.itemTime(forHostTime: CACurrentMediaTime()) if videoOutput.hasNewPixelBuffer(forItemTime: itemTime) { if let pixelBuffer = videoOutput.copyPixelBuffer(forItemTime:

问题 So my app is running in the background because of CoreLocation that has requested AlwaysAuthorization. This prevents app to reach suspended state. It stays in background state and is receiving location events. After some location events I would like to activate AVAudioSession and play some sounds. How to activate session properly (in this background app) when I'm using other app in foreground right now and this app is playing audio track for example. Suppose I'm watching some video in Youtube

问题 I want to play liveStream on iPhoneDevice with AVPlayer. Also i want to get CVPixelBufferRef from this stream for next usage. I use Apple guide for creating player. Currently with locally stored videoFiles this player works just fine, also when i try to play this AppleSampleStremURL - http://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8 - its work sine too. Problems appear when i want to play stream with rtsp:// like this one: rtsp://192.192.168.1:8227/TTLS/Streaming/channels/2

问题 I want to play liveStream on iPhoneDevice with AVPlayer. Also i want to get CVPixelBufferRef from this stream for next usage. I use Apple guide for creating player. Currently with locally stored videoFiles this player works just fine, also when i try to play this AppleSampleStremURL - http://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8 - its work sine too. Problems appear when i want to play stream with rtsp:// like this one: rtsp://192.192.168.1:8227/TTLS/Streaming/channels/2

问题 I have recording app implementation where user can tap the "record" button to start/stop recording. I achieve this with a basic GPUImageVideoCamera with output set to a GPUImageView as well as a GPUImageMovieWriter . 50% of the time, the recorded clip ends up with a couple (or a single) black frame at either ends, sometimes both. The implementation is fairly straightforward, but here is it anyway. gpuImageView = [[GPUImageView alloc] initWithFrame:cameraView.frame]; gpuImageView.fillMode =

问题 I'm using AVMutableComposition and AVAssetExportSession to trim a video down. Randomly, and I mean randomly (I cannot consistently reproduce) users' videos have a few black frames at the start of the trimmed video. The audio is unaffected. I can confirm 100% that the videos being trimmed don't have anything to do with it, as this happens for a wide variety of videos from all different sources. Any insight into why these videos are being exported with black frames in the start would be very