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• C# UWP Desktop Bridge start ffmpeg with command

  4 décembre 2019, par iNCEPTiON_

  I have a UWP Application which starts a WPF app and communicates via AppServiceConnection which works well,
  what I want to do is to start FFmpeg / FFplay with the command to play a video.

  The code in the WPF app for starting FFmpeg / FFplay via AppServiceConnection

  private void Connection_RequestReceivedAsync(AppServiceConnection sender, AppServiceRequestReceivedEventArgs args)
  
          {
  
              var value = args.Request.Message["REQUEST"] as string;
  
              switch (value)
  
              {
  
                  case "StartFFmpeg":
  
                      Test();
  
                      break;
  
              }
  
          }
  
  
  
          private void Test()
  
          {
  
              var process = new Process();
  
              process.StartInfo.RedirectStandardOutput = true;
  
              process.StartInfo.RedirectStandardError = true;
  
              process.StartInfo.FileName = Path.GetDirectoryName(Process.GetCurrentProcess().MainModule.FileName) + @"\ffplay.exe";
  
              process.StartInfo.Arguments = @"-i C:\Users\test\video.mp4";
  
  
  
  
  
              process.StartInfo.UseShellExecute = false;
  
              process.StartInfo.CreateNoWindow = true;
  
              process.Start();
  
          }

  this fails with the following error in the UWP app :

  The target process exited without raising a CoreCLR started event. Ensure that the target process is configured to use .NET Core. This may be expected if the target process did not run on .NET Core.
  
  The program '[16824] FFmpeg.Bridge.exe' has exited with code -532462766 (0xe0434352).

  now my question is, is it possible to start FFmpeg / FFplay with the desktop bridge ? or can we only start .net core processes, the process is running with full privileges so why is that not possible ?

  The UWP App won’t be published on the store, it will only run on a local windows machine.

• while uploading video get screen shots with ffmpeg tool & php [on hold]

  4 décembre 2014, par ilinkthreesixty

  Can you tell me what is ffmpeg and for which purposes it is used in or with PHP ... ?

  I wanna learn it to create thumbnails while uploading a video to rotate them when mouse is over the video when it is done, It’s an effect which is used on dailymotion and even facebook is using it on it’s Album when mouse is hover over a user Album it rotate the thumbnails so i want to learn how to get thumbnail screen shots on the flying while video is uploading ... Hope you have got me.

• Unable to access user selected file via NSOpenPanel in FFMPEG process in macOS app

  12 décembre 2019, par Raptor

  I am new to macOS development via SwiftUI. I’m trying to run a FFMPEG process after I selected a MP4 file via NSOpenPanel. However, the FFMPEG responded with :

  file :///Users/MyUsername/Documents/Video.mp4 : No such file or directory

  Here is my simple codes :

  import SwiftUI
  
  
  
  struct ContentView: View {
  
  
  
      @State var selectedURL: URL?
  
  
  
      var body: some View {
  
          VStack {
  
              if selectedURL != nil {
  
                  Text("Selected: \(selectedURL!.absoluteString)")
  
              } else {
  
                  Text("Nothing selected")
  
              }
  
              Button(action: {
  
                  let panel = NSOpenPanel()
  
                  panel.allowedFileTypes = ["mp4"]
  
                  panel.canChooseDirectories = false
  
                  panel.canCreateDirectories = false
  
                  panel.allowsMultipleSelection = false
  
                  let result = panel.runModal()
  
                  if result == .OK {
  
                      self.selectedURL = panel.url
  
  
  
                      let savePath = self.getDownloadDirectory().appendingPathComponent("video.webm")
  
  
  
                      self.convertVideo(inputFilePath: self.selectedURL!.absoluteString, outputFilePath: savePath.absoluteString, callback: {(s) in
  
                          // omit the callback at this moment
  
                      })
  
                  }
  
              }) {
  
                  Text("Select File")
  
              }
  
          }
  
          .frame(width: 640, height: 480)
  
      }
  
  
  
      func getDownloadDirectory() -> URL {
  
          let paths = FileManager.default.urls(for: .downloadsDirectory, in: .userDomainMask)
  
          return paths[0]
  
      }
  
  
  
      func convertVideo(inputFilePath: String, outputFilePath: String,
  
                       callback: @escaping (Bool) -> Void) -> (Process, DispatchWorkItem)? {
  
          guard let launchPath = Bundle.main.path(forResource: "ffmpeg", ofType: "") else {
  
              return nil
  
          }
  
          let process = Process()
  
          let task = DispatchWorkItem {
  
              process.launchPath = launchPath
  
              process.arguments = [
  
                  "-y",
  
                  "-i", inputFilePath,
  
                  "-vcodec", "vp8",
  
                  "-acodec", "libvorbis",
  
                  "-pix_fmt", "yuva420p",
  
                  "-metadata:s:v:0",
  
                  "alpha_mode=\"1\"",
  
                  "-auto-alt-ref", "0",
  
                  outputFilePath
  
              ]
  
              process.standardInput = FileHandle.nullDevice
  
              process.launch()
  
              process.terminationHandler = { process in
  
                  callback(process.terminationStatus == 0)
  
              }
  
          }
  
          DispatchQueue.global(qos: .userInitiated).async(execute: task)
  
  
  
          return (process, task)
  
      }
  
  }

  What did I miss to allow FFMPEG process to access my selected file ? Thanks !