GPUImage2-如何獲取處理后的視頻URL保存在設備中？

Question

有人在應用視頻過濾器后請幫助我從GPUImage2庫獲取經過處理的視頻URL？

do {
    let bundleURL = Bundle.main.resourceURL!
    let movieURL = URL(string:"sample_iPod.m4v", relativeTo:bundleURL)!
    movie = try MovieInput(url:movieURL, playAtActualSpeed:true)
    filter = SaturationAdjustment()
    movie --> filter --> renderView
    movie.start()
} catch {
    fatalError("Could not initialize rendering pipeline: \(error)")
}

預先感謝，詹姆斯

Answer 1

 func applyfilters(){
    do {
        // movie input
        movieInput = try MovieInput(url: inputVideoUrl, playAtActualSpeed: true, loop: false)

        // movie output
        movieOutput = try MovieOutput(URL: outputVideoUrl, size: videoSize, liveVideo: false)             

        // pipeline
        movieInput.addTarget(currentFilter)
        currentFilter.addTarget(renderView)
        currentFilter.addTarget(movieOutput!)

        movieOutput!.startRecording()
        movieInput.start()

    } catch {
        print(error.localizedDescription)
    }
 }

 //Below function should be called after the filter is applied on full video. If you call this function before video ends it will not generate the rest part of the video.

 func stopVideoRecording(completion: (() -> Void)?) {
    movieOutput?.finishRecording {
        completion?()
    }
 }

 //To save video
 func saveVideo(){
    PHPhotoLibrary.shared().performChanges({
        PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: outputVideoUrl)
    }) { saved, error in
        if saved {
            let alertController = UIAlertController(title: "Your video was successfully saved", message: nil, preferredStyle: .alert)
            let defaultAction = UIAlertAction(title: "OK", style: .default, handler: nil)
            alertController.addAction(defaultAction)
            self.present(alertController, animated: true, completion: nil)
        }
    }
 }

使用范例

  applyFilters()

  DispatchQueue.main.asyncAfter(deadline:.now()+AVAsset(url:inputVideoUrl).duration.seconds, execute: {
       stopVideoRecording{
            self.saveVideo()
       }
  })