【iOS】视频录像相关功能调研（二）

本文主要是介绍【iOS】视频录像相关功能调研（二），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1、获取视频时长（秒数）

    //MARK: 获取视频时长（秒数）@objc func getVideoLength() {let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true )let documentsDirectory = paths[0]  as  Stringlet videoPath = documentsDirectory + "/" + "1619172935.mp4"if !FileManager.default.fileExists(atPath: videoPath) {print("文件不存在，请先拍照，再修改视频地址")return}let avUrlAsset = AVURLAsset.init(url: URL(fileURLWithPath: videoPath))let cmtime = avUrlAsset.durationlet second = Int(cmtime.seconds)print("视频秒数 == \(second)")}

2、获取视频文件大小

    //MARK: 获取视频文件大小//文件属性@objc func getVideoSize() {let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true )let documentsDirectory = paths[0]  as  Stringlet videoPath = documentsDirectory + "/" + "1619172935.mp4"if !FileManager.default.fileExists(atPath: videoPath) {print("文件不存在，请先拍照，再修改视频地址")return}let fileManager = FileManager.defaultif fileManager.fileExists(atPath: videoPath) {let fileDic = try! fileManager.attributesOfItem(atPath: videoPath)let size = fileDic[FileAttributeKey(rawValue: "NSFileSize")] as? Int ?? 0print("\(size)B")print("\(size/1024)KB")let sizeM = String(format: "%.2f", Float(size)/1024/1024)print(sizeM + "M")}else{print("文件不存在")}}

3、获取指定时间帧图片

    //MARK: 获取指定时间帧图片/// 获取指定时间帧图片/// - Parameters:///   - videoUrl: 视频地址///   - cmtime: 指定的时间///   - width: 宽度 根据视频的宽高比来计算图片的高度@objc func getImage() {let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true )let documentsDirectory = paths[0]  as  Stringlet videoPath = documentsDirectory + "/" + "1619172935.mp4"if !FileManager.default.fileExists(atPath: videoPath) {print("文件不存在，请先拍照，再修改视频地址")return}let cmtime = CMTimeMake(value: 1, timescale: 10)let width = 300// 获取指定时间的帧图片DispatchQueue.global().async {//建立新的AVAsset & AVAssetImageGeneratorlet asset = AVAsset.init(url: URL(fileURLWithPath: videoPath))let imageGenerator = AVAssetImageGenerator.init(asset: asset)//设置maximumSize 宽为100，高为0 根据视频的宽高比来计算图片的高度 控制图片清晰度imageGenerator.maximumSize = CGSize(width: width, height: 0)//捕捉视频缩略图会考虑视频的变化（如视频的方向变化），如果不设置，缩略图的方向可能出错imageGenerator.appliesPreferredTrackTransform = true// CMTimeMake第一个参数是时间，第二个参数是 每秒的分数 第一个/第二个 才是秒let imageRef = try! imageGenerator.copyCGImage(at:cmtime, actualTime: nil)//将图片转化为UIImagelet image = UIImage.init(cgImage: imageRef)DispatchQueue.main.async {//保存到相册self.saveImage(image: image)}}}

4、多视频合成

@objc func starMerge() {let videoPaths = ["1619163716.mp4","1619163734.mp4","1619163741.mp4"]for i in 0..<videoPaths.count {if !FileManager.default.fileExists(atPath: videoPaths[i]) {print("文件不存在，请先拍照，再修改视频地址")return}}let outputPath = self.getNewPath(videoTyle: AVFileType.mp4)self.mergeVideo(videoPaths: videoPaths, outputPath: outputPath) { (success) inif success {print("多视频合成 成功")}else{print("多视频合成 失败")}}}//MARK: 多视频合成func mergeVideo(videoPaths:[String], outputPath:String, completeHandler:@escaping (Bool)->()) {if videoPaths.count < 2 {return}let mixComposition = AVMutableComposition()//音频轨道let audioTrack = mixComposition.addMutableTrack(withMediaType: AVMediaType.audio, preferredTrackID: kCMPersistentTrackID_Invalid)//视频轨道let videoTrack = mixComposition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID: kCMPersistentTrackID_Invalid)var totalDuration = CMTime.zerolet paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true )let documentsDirectory = paths[0]  as  Stringfor i in 0 ..< videoPaths.count {let pathUrl = documentsDirectory + "/\(videoPaths[i])"if !FileManager.default.fileExists(atPath: pathUrl) {print("文件不存在")break}let asset = AVURLAsset.init(url: URL(fileURLWithPath: pathUrl))// 获取AVAsset中的音频let assetAudioTracks = asset.tracks(withMediaType: AVMediaType.audio)if assetAudioTracks.count == 0 {print("未获取到音频")break}// 向通道内加入音频try! audioTrack?.insertTimeRange(CMTimeRangeMake(start: CMTime.zero, duration: asset.duration), of: assetAudioTracks.first!, at: totalDuration)// 获取AVAsset中的视频let assetVideoTracks = asset.tracks(withMediaType: AVMediaType.video)if assetVideoTracks.count == 0 {print("未获取到视频")break}// 向通道内加入视频try! videoTrack?.insertTimeRange(CMTimeRangeMake(start: CMTime.zero, duration: asset.duration), of: assetVideoTracks.first!, at: totalDuration)totalDuration = CMTimeAdd(totalDuration, asset.duration)}// 导出合成后的视频let outputURL = URL(fileURLWithPath: outputPath)let avAssetExportSession = AVAssetExportSession.init(asset: mixComposition, presetName: AVAssetExportPresetMediumQuality)avAssetExportSession?.outputURL = outputURLavAssetExportSession?.outputFileType = .mp4avAssetExportSession?.shouldOptimizeForNetworkUse = trueavAssetExportSession?.exportAsynchronously {switch avAssetExportSession?.status {case .unknown:print("AVAssetExportSessionStatusUnknown")breakcase .waiting:print("AVAssetExportSessionStatusWaiting")breakcase .exporting:print("AVAssetExportSessionStatusExporting")breakcase .completed:print("AVAssetExportSessionStatusCompleted")self.getVideoSize(videoUrl: outputURL)self.getVideoLength(videoUrl: outputURL)completeHandler(true)breakcase .failed:print("AVAssetExportSessionStatusFailed")completeHandler(false)breakcase .cancelled:print("AVAssetExportSessionStatusCancelled")completeHandler(false)breakdefault:break}}}

5、视频压缩/转码

    @objc func starConvert() {let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true )let documentsDirectory = paths[0]  as  Stringlet videoPath = documentsDirectory + "/" + "1619331826.mp4"if !FileManager.default.fileExists(atPath: videoPath) {print("文件不存在，请先拍照，再修改视频地址")return}let outputPath = self.getNewPath(videoTyle: AVFileType.mov)self.convertVideo(inputURL: URL(fileURLWithPath: videoPath),outputURL: URL(fileURLWithPath: outputPath),presetName: AVAssetExportPresetMediumQuality) { (success) inif success {print("压缩/转码 成功")}else{print("压缩/转码 失败")}}}//MARK: 视频压缩//转换格式/// 视频压缩//转换格式/// - Parameters:///   - inputURL: 视频地址///   - outputURL: 视频压缩后的地址///   - presetName: 视频预设///   - completeHandler: <#completeHandler description#>/// - Returns: <#description#>func convertVideo(inputURL:URL, outputURL:URL, presetName:String = AVAssetExportPresetMediumQuality, completeHandler:@escaping (Bool)->()) {let avAsset = AVURLAsset.init(url: inputURL)let avAssetExportSession = AVAssetExportSession.init(asset: avAsset, presetName: presetName)avAssetExportSession?.outputURL = outputURLavAssetExportSession?.outputFileType = .mp4avAssetExportSession?.shouldOptimizeForNetworkUse = trueavAssetExportSession?.exportAsynchronously {switch avAssetExportSession?.status {case .unknown:print("AVAssetExportSessionStatusUnknown")breakcase .waiting:print("AVAssetExportSessionStatusWaiting")breakcase .exporting:print("AVAssetExportSessionStatusExporting")breakcase .completed:print("AVAssetExportSessionStatusCompleted")self.getVideoSize(videoUrl: outputURL)self.getVideoLength(videoUrl: outputURL)completeHandler(true)breakcase .failed:print("AVAssetExportSessionStatusFailed")completeHandler(false)breakcase .cancelled:print("AVAssetExportSessionStatusCancelled")completeHandler(false)breakdefault:break}}}

6、添加水印（图片、文字）

    @objc func starAddImage() {let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true )let documentsDirectory = paths[0]  as  Stringlet videoPath = documentsDirectory + "/" + "1619343879.mp4"if !FileManager.default.fileExists(atPath: videoPath) {print("文件不存在，请先拍照，再修改视频地址")return}let outputPath = self.getNewPath(videoTyle: AVFileType.mp4)print(outputPath)self.videoAddMark(imageName: "good", title: nil, inputPath: videoPath, outputPath: outputPath) { (success) inif success {print("添加水印 成功")}else{print("添加水印 失败")}}}@objc func starAddTitle() {let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true )let documentsDirectory = paths[0]  as  Stringlet videoPath = documentsDirectory + "/" + "1619343879.mp4"if !FileManager.default.fileExists(atPath: videoPath) {print("文件不存在，请先拍照，再修改视频地址")return}let outputPath = self.getNewPath(videoTyle: AVFileType.mp4)print(outputPath)self.videoAddMark(imageName: nil, title: "啦啦啦", inputPath: videoPath, outputPath: outputPath) { (success) inif success {print("添加水印 成功")}else{print("添加水印 失败")}}}//添加水印func videoAddMark(imageName:String?, title:String?, inputPath:String, outputPath:String, completeHandler:@escaping (Bool)->()) {//创建AVAsset实例let videoAsset = AVURLAsset.init(url: URL(fileURLWithPath: inputPath))let mixComposition = AVMutableComposition()//音频轨道let audioTrack = mixComposition.addMutableTrack(withMediaType: AVMediaType.audio, preferredTrackID: kCMPersistentTrackID_Invalid)// 获取AVAsset中的音频let assetAudioTracks = videoAsset.tracks(withMediaType: AVMediaType.audio)if assetAudioTracks.count == 0 {print("未获取到音频")return}// 向通道内加入音频try! audioTrack?.insertTimeRange(CMTimeRangeMake(start: CMTime.zero, duration: videoAsset.duration), of: assetAudioTracks.first!, at: CMTime.zero)//视频轨道let videoTrack = mixComposition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID: kCMPersistentTrackID_Invalid)// 获取AVAsset中的视频let assetVideoTracks = videoAsset.tracks(withMediaType: AVMediaType.video)if assetVideoTracks.count == 0 {print("未获取到视频")return}// 向通道内加入视频try! videoTrack?.insertTimeRange(CMTimeRangeMake(start: CMTime.zero, duration: videoAsset.duration), of: assetVideoTracks.first!, at: CMTime.zero)//1 AVMutableVideoCompositionInstruction 视频轨道中的一个视频，可以缩放、旋转等let mainInstruction = AVMutableVideoCompositionInstruction()mainInstruction.timeRange = CMTimeRangeMake(start: CMTime.zero, duration: videoAsset.duration)// 2 AVMutableVideoCompositionLayerInstruction 一个视频轨道，包含了这个轨道上的所有视频素材let videolayerInstruction = AVMutableVideoCompositionLayerInstruction.init(assetTrack: videoTrack!)let videoTransform = (assetVideoTracks.first?.preferredTransform)!var isVideoAssetPortrait = truevar naturalSize = (assetVideoTracks.first?.naturalSize)!if videoTransform.a == 0,videoTransform.b == 1,videoTransform.c == -1,videoTransform.d == 0{isVideoAssetPortrait = true} else if videoTransform.a == 0,videoTransform.b == -1,videoTransform.c == 1,videoTransform.d == 0 {isVideoAssetPortrait = true} else if videoTransform.a == 1,videoTransform.b == 0,videoTransform.c == 0,videoTransform.d == 1 {isVideoAssetPortrait = false} else if videoTransform.a == -1,videoTransform.b == 0,videoTransform.c == 0,videoTransform.d == -1 {isVideoAssetPortrait = false}videolayerInstruction.setTransform(videoTransform, at: CMTime.zero)// 3 - Add instructionsmainInstruction.layerInstructions = [videolayerInstruction]//AVMutableVideoComposition：管理所有视频轨道，水印添加就在这上面let mainCompositionInst = AVMutableVideoComposition()if isVideoAssetPortrait {naturalSize = CGSize(width: naturalSize.height, height: naturalSize.width)}let width = naturalSize.widthlet height = naturalSize.heightmainCompositionInst.renderSize = CGSize.init(width: width, height: height)mainCompositionInst.instructions = [mainInstruction]mainCompositionInst.frameDuration = CMTimeMake(value: 1, timescale: 30)if title == nil && (imageName == nil || UIImage(named: imageName!) == nil) {completeHandler(false)return}let overlayLayer = CALayer()if title != nil {// 文字let subtitle1Text = CATextLayer()subtitle1Text.font = "Helvetica-Bold" as CFTypeRefsubtitle1Text.fontSize = 40subtitle1Text.frame = CGRect(x: width/2-100, y: height/2-60, width: 200, height: 120)subtitle1Text.string = titlesubtitle1Text.alignmentMode = .centersubtitle1Text.foregroundColor = UIColor.white.cgColoroverlayLayer.addSublayer(subtitle1Text)}if imageName != nil, let image = UIImage(named: imageName!) {//图片let picLayer = CALayer()picLayer.contents = image.cgImagepicLayer.frame = CGRect(x: width/2-80, y: height/2-80, width: 160, height: 160)overlayLayer.addSublayer(picLayer)}overlayLayer.frame = CGRect(x: 0, y: 0, width: width, height: height)overlayLayer.masksToBounds = truelet parentLayer = CALayer()let videoLayer = CALayer()parentLayer.frame = CGRect(x: 0, y: 0, width: width, height: height)videoLayer.frame = CGRect(x: 0, y: 0, width: width, height: height)parentLayer.addSublayer(videoLayer)parentLayer.addSublayer(overlayLayer)mainCompositionInst.animationTool = AVVideoCompositionCoreAnimationTool.init(postProcessingAsVideoLayer: videoLayer, in: parentLayer)// 导出合成后的视频let outputURL = URL(fileURLWithPath: outputPath)let avAssetExportSession = AVAssetExportSession.init(asset: mixComposition, presetName: AVAssetExportPresetMediumQuality)avAssetExportSession?.outputURL = outputURLavAssetExportSession?.outputFileType = .mp4avAssetExportSession?.shouldOptimizeForNetworkUse = trueavAssetExportSession?.videoComposition = mainCompositionInst;avAssetExportSession?.exportAsynchronously {switch avAssetExportSession?.status {case .unknown:print("AVAssetExportSessionStatusUnknown")breakcase .waiting:print("AVAssetExportSessionStatusWaiting")breakcase .exporting:print("AVAssetExportSessionStatusExporting")breakcase .completed:print("AVAssetExportSessionStatusCompleted")self.getVideoSize(videoUrl: outputURL)self.getVideoLength(videoUrl: outputURL)completeHandler(true)breakcase .failed:print("AVAssetExportSessionStatusFailed")completeHandler(false)breakcase .cancelled:print("AVAssetExportSessionStatusCancelled")completeHandler(false)breakdefault:break}}}

7、获取一个新的沙盒存储地址

    //MARK: 获取一个新的沙盒存储地址/// 获取一个新的沙盒存储地址/// - Returns: <#description#>func getNewPath(videoTyle: AVFileType) -> String {let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true )let documentsDirectory = paths[0]  as  Stringlet timeInterval = Int(Date().timeIntervalSince1970)var filePath = "\(documentsDirectory)/\(timeInterval)"switch videoTyle {case .mp4:filePath = filePath + ".mp4"breakcase .mov:filePath = filePath + ".mov"breakdefault:filePath = filePath + ".mp4"break}return filePath}

8、根据路径删除沙盒中某个文件

    //MARK: 根据路径删除沙盒中某个文件func deleteFile(path:String) -> Bool {if FileManager.default.fileExists(atPath: path) {do {try FileManager.default.removeItem(atPath: path)return true} catch  {return false}}return false}

9、保存图片到相册

    //MARK: 保存图片到相册func saveImage(image: UIImage) {UIImageWriteToSavedPhotosAlbum(image, self, #selector(self.saveImage(image:didFinishSavingWithError:contextInfo:)), nil)}@objc private func saveImage(image: UIImage, didFinishSavingWithError error: NSError?, contextInfo: AnyObject) {var info = ""if error != nil{info = "保存图片失败"}else{info = "保存图片成功"}print(info)}

10、保存视频到相册

    //MARK:保存视频到相册func saveVideoToAlbum(videoUrl: URL) {var info = ""PHPhotoLibrary.shared().performChanges({PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: videoUrl)}) { (success, error) inif success {info = "保存成功"} else {info = "保存失败，err = \(error.debugDescription)"}DispatchQueue.main.async {let alertVC = UIAlertController(title: info, message: nil, preferredStyle: .alert)alertVC.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))self.present(alertVC, animated: true, completion: nil)}}}

这篇关于【iOS】视频录像相关功能调研（二）的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---