如何在特定时间内快速修剪video
我正在处理一项任务，我必须将录制的video从特定的起始点修剪为用户输入或选择的特定终点。 我该怎么做呢 因为之前我使用过UIVideoEditorController ，但我不想使用默认视图，我想直接修剪video。
let FinalUrlTosave = NSURL(string: "\(newURL)") exportSession!.outputURL=FinalUrlTosave exportSession!.shouldOptimizeForNetworkUse = true // exportSession.outputFileType = AVFileTypeQuickTimeMovie exportSession!.outputFileType = AVFileTypeQuickTimeMovie; let start:CMTime let duration:CMTime var st = starttime.doubleValue var ed = endTime.doubleValue start = CMTimeMakeWithSeconds(st, 600) duration = CMTimeMakeWithSeconds(ed, 600) // let timeRangeForCurrentSlice = CMTimeRangeMake(start, duration) let range = CMTimeRangeMake(start, duration); exportSession!.timeRange = range exportSession!.exportAsynchronouslyWithCompletionHandler({ switch exportSession!.status{ case AVAssetExportSessionStatus.Failed: print("failed \(exportSession!.error)") case AVAssetExportSessionStatus.Cancelled: print("cancelled \(exportSession!.error)") default: print("complete....complete") // self.SaveVideoToPhotoLibrary(destinationURL1!) } })
我试图用这个来实现我的目标，但没有成功。
错误信息：
failed可选（错误域= NSURLErrorDomain代码= -1100“在此服务器上找不到请求的URL。”UserInfo = {NSErrorFailingURLStringKey = file：/// var / mobile / Containers / Data / Application / E68D3BFD-6923-4EA6-9FB3 -C020CE4AA9D4 / Documents / moment / jGq_9AUFa47s2ZiiPP4x.mp4，NSErrorFailingURLKey = file：///var/mobile/Containers/Data/Application/E68D3BFD-6923-4EA6-9FB3-C020CE4AA9D4/Documents/moment/jGq_9AUFa47s2ZiiPP4x.mp4,NSLocalizedDescription =要求在此服务器上找不到URL。，NSUnderlyingError = 0x1553c220 {错误域= N.
第二次出错：
failed可选（错误域= NSURLErrorDomain代码= -3000“无法创建文件”UserInfo = {NSUnderlyingError = 0x14e00000 {Error Domain = NSOSStatusErrorDomain Code = -12124“（null）”}，NSLocalizedDescription =无法创建文件}）
我找到了使用这种方法的解决方案，它就像一个魅力….
func cropVideo(sourceURL1: NSURL, statTime:Float, endTime:Float) { let manager = NSFileManager.defaultManager() guard let documentDirectory = try? manager.URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: true) else {return} guard let mediaType = "mp4" as? String else {return} guard let url = sourceURL1 as? NSURL else {return} if mediaType == kUTTypeMovie as String || mediaType == "mp4" as String { let asset = AVAsset(URL: url) let length = Float(asset.duration.value) / Float(asset.duration.timescale) print("video length: \(length) seconds") let start = statTime let end = endTime var outputURL = documentDirectory.URLByAppendingPathComponent("output") do { try manager.createDirectoryAtURL(outputURL, withIntermediateDirectories: true, attributes: nil) let name = Moment.newName() outputURL = outputURL.URLByAppendingPathComponent("\(name).mp4") }catch let error { print(error) } //Remove existing file _ = try? manager.removeItemAtURL(outputURL) guard let exportSession = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetHighestQuality) else {return} exportSession.outputURL = outputURL exportSession.outputFileType = AVFileTypeMPEG4 let startTime = CMTime(seconds: Double(start ?? 0), preferredTimescale: 1000) let endTime = CMTime(seconds: Double(end ?? length), preferredTimescale: 1000) let timeRange = CMTimeRange(start: startTime, end: endTime) exportSession.timeRange = timeRange exportSession.exportAsynchronouslyWithCompletionHandler{ switch exportSession.status { case .Completed: print("exported at \(outputURL)") self.saveVideoTimeline(outputURL) case .Failed: print("failed \(exportSession.error)") case .Cancelled: print("cancelled \(exportSession.error)") default: break } } } }
一个swift4版本。
static func cropVideo(sourceURL: URL, startTime: Double, endTime: Double, completion: ((_ outputUrl: URL) -> Void)? = nil) { let fileManager = FileManager.default let documentDirectory = fileManager.urls(for: .documentDirectory, in: .userDomainMask)[0] let asset = AVAsset(url: sourceURL) let length = Float(asset.duration.value) / Float(asset.duration.timescale) print("video length: \(length) seconds") var outputURL = documentDirectory.appendingPathComponent("output") do { try fileManager.createDirectory(at: outputURL, withIntermediateDirectories: true, attributes: nil) outputURL = outputURL.appendingPathComponent("\(sourceURL.lastPathComponent).mp4") }catch let error { print(error) } //Remove existing file try? fileManager.removeItem(at: outputURL) guard let exportSession = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetHighestQuality) else { return } exportSession.outputURL = outputURL exportSession.outputFileType = .mp4 let timeRange = CMTimeRange(start: CMTime(seconds: startTime, preferredTimescale: 1000), end: CMTime(seconds: endTime, preferredTimescale: 1000)) exportSession.timeRange = timeRange exportSession.exportAsynchronously { switch exportSession.status { case .completed: print("exported at \(outputURL)") completion?(outputURL) case .failed: print("failed \(exportSession.error.debugDescription)") case .cancelled: print("cancelled \(exportSession.error.debugDescription)") default: break } } }
func cropVideo1（_ sourceURL1：URL，statTime：Float，endTime：Float）
{ let videoAsset: AVAsset = AVAsset(url: sourceURL1) as AVAsset let composition = AVMutableComposition() composition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: CMPersistentTrackID()) let videoComposition = AVMutableVideoComposition() videoComposition.renderSize = CGSize(width: 1280, height: 768) videoComposition.frameDuration = CMTimeMake(8, 15) let instruction = AVMutableVideoCompositionInstruction() let length = Float(videoAsset.duration.value) print(length) instruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(60, 30)) let start = statTime let end = endTime let exportSession = AVAssetExportSession(asset: videoAsset, presetName: AVAssetExportPresetHighestQuality)! exportSession.outputFileType = AVFileTypeMPEG4 let startTime = CMTime(seconds: Double(start ), preferredTimescale: 1000) let endTime = CMTime(seconds: Double(end ), preferredTimescale: 1000) let timeRange = CMTimeRange(start: startTime, end: endTime) exportSession.timeRange = timeRange let formatter = DateFormatter() formatter.dateFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ss'Z'" let date = Date() let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString let outputPath = "\(documentsPath)/\(formatter.string(from: date)).mp4" let outputURL = URL(fileURLWithPath: outputPath) exportSession.outputURL = outputURL exportSession.outputFileType = AVFileTypeQuickTimeMovie print("sucess") exportSession.exportAsynchronously(completionHandler: { () -> Void in DispatchQueue.main.async(execute: { self.exportDidFinish(exportSession) print("sucess") DispatchQueue.main.async(execute: { }); }) }) }
func exportDidFinish（_ session：AVAssetExportSession）{
if session.status == AVAssetExportSessionStatus.completed { let outputURL = session.outputURL let library = ALAssetsLibrary() if library.videoAtPathIs(compatibleWithSavedPhotosAlbum: outputURL) { library.writeVideoAtPath(toSavedPhotosAlbum: outputURL) { alAssetURL, error in if error != nil { DispatchQueue.main.async(execute: { print("Failed to save video") }) } else { DispatchQueue.main.async(execute: { Print("Sucessfully saved Video") }) } self.activityIndicator.stopAnimating() } } } }