Swift – 压缩video文件

所以，目前我正在使用这个压缩video：

func compressVideo(inputURL: NSURL, outputURL: NSURL, handler:(session: AVAssetExportSession)-> Void) { let urlAsset = AVURLAsset(URL: inputURL, options: nil) let exportSession = AVAssetExportSession(asset: urlAsset, presetName: AVAssetExportPresetMediumQuality) exportSession!.outputURL = outputURL exportSession!.outputFileType = AVFileTypeQuickTimeMovie exportSession!.shouldOptimizeForNetworkUse = true exportSession!.exportAsynchronouslyWithCompletionHandler { () -> Void in handler(session: exportSession!) } } 

当我在2秒内录制video时，尺寸为4.3 MB ，当我在6秒内录制video时，文件大小为9.3 MB 。

任何提示，以减less大小？

Answer 1

虽然这些扩展名都使用中等设置进行压缩，但如果要关注质量或大小，则可以将其更改为低或高。

我使用这些基于Swift版本的扩展：

对于OP（ Swift 2.2 ）：

 extension PreviewVideoViewController: AVCaptureFileOutputRecordingDelegate { func captureOutput(captureOutput: AVCaptureFileOutput!, didFinishRecordingToOutputFileAtURL outputFileURL: NSURL!, fromConnections connections: [AnyObject]!, error: NSError!) { let data = NSData(contentsOfURL: outputFileURL) print("File size before compression: \(Double(data!.length / 1048576)) mb") let compressedURL = NSURL.fileURLWithPath(NSTemporaryDirectory() + NSUUID().UUIDString + ".m4v") compressVideo(outputFileURL, outputURL: compressedURL) { (session) in switch session.status { case .Unknown: break case .Waiting: break case .Exporting: break case .Completed: let data = NSData(contentsOfURL: compressedURL) print("File size after compression: \(Double(data!.length / 1048576)) mb") case .Failed: break case .Cancelled: break } } } private func compressVideo(inputURL: NSURL, outputURL: NSURL, handler:(session: AVAssetExportSession)-> Void) { let urlAsset = AVURLAsset(URL: inputURL, options: nil) if let exportSession = AVAssetExportSession(asset: urlAsset, presetName: AVAssetExportPresetMediumQuality) { exportSession.outputURL = outputURL exportSession.outputFileType = AVFileTypeQuickTimeMovie exportSession.shouldOptimizeForNetworkUse = true exportSession.exportAsynchronouslyWithCompletionHandler { () -> Void in handler(session: exportSession) } } } } 

对于Swift 3.0中需要它的人来说：

 extension PreviewVideoViewController: AVCaptureFileOutputRecordingDelegate { func capture(_ captureOutput: AVCaptureFileOutput!, didFinishRecordingToOutputFileAt outputFileURL: URL!, fromConnections connections: [Any]!, error: Error!) { guard let data = NSData(contentsOf: outputFileURL as URL) else { return } print("File size before compression: \(Double(data.length / 1048576)) mb") let compressedURL = NSURL.fileURL(withPath: NSTemporaryDirectory() + NSUUID().uuidString + ".m4v") compressVideo(inputURL: outputFileURL as URL, outputURL: compressedURL) { (exportSession) in guard let session = exportSession else { return } switch session.status { case .unknown: break case .waiting: break case .exporting: break case .completed: guard let compressedData = NSData(contentsOf: compressedURL) else { return } print("File size after compression: \(Double(compressedData.length / 1048576)) mb") case .failed: break case .cancelled: break } } } func compressVideo(inputURL: URL, outputURL: URL, handler:@escaping (_ exportSession: AVAssetExportSession?)-> Void) { let urlAsset = AVURLAsset(url: inputURL, options: nil) guard let exportSession = AVAssetExportSession(asset: urlAsset, presetName: AVAssetExportPresetMediumQuality) else { handler(nil) return } exportSession.outputURL = outputURL exportSession.outputFileType = AVFileTypeQuickTimeMovie exportSession.shouldOptimizeForNetworkUse = true exportSession.exportAsynchronously { () -> Void in handler(exportSession) } } }