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• Can't record full screen using FFMEG Video File Writer - C#

  2 avril 2019, par nsds

  My app need to record entire screen as video. For that I have installed

  AForge.Video.FFMPEG

  and did like below. Now I can record the screen. But some bottom area and right end area of screen is missing. Can anyone suggest what causes the issue ? I want to record the entire screen.

  SystemInformation.VirtualScreen

  is used to calculate screen size. it is getting as 1536*864

    private ScreenCaptureStream _streamVideo;
  
    private VideoFileWriter _Screenwriter;
  
    private Rectangle _screenArea;
  
    private bool _isScreenRecording;
  
    private int _Screenwidth;
  
    private int _Screenheight;
  
    public RecordVideo()
  
      {
  
          InitializeComponent(); 
  
          this._Screenwriter = new VideoFileWriter();
  
          this._Screenwidth = SystemInformation.VirtualScreen.Width;
  
          this._Screenheight = SystemInformation.VirtualScreen.Height;
  
          this._isScreenRecording = false;
  
          this._screenArea = Rectangle.Empty;
  
        }
  
   private void btn_startRecord_Click(object sender, EventArgs e)
  
      {
  
          try
  
          {        
  
          if (btn_screenRecord.Text == "Record")
  
          {
  
              FolderBrowserDialog fbd = new FolderBrowserDialog();
  
              if (fbd.ShowDialog() == DialogResult.OK)
  
              {
  
                  _isScreenRecording = true;
  
                  this.StartRecScreen(fbd.SelectedPath);
  
              }
  
          }
  
          else
  
          {
  
              _isScreenRecording = false;
  
              btn_screenRecord.Text = "Record";
  
              MessageBox.Show(@"Recorded !");
  
          }
  
          }
  
          catch (Exception EX)
  
          { MessageBox.Show(EX.Message); }
  
      }
  
  
  
  private void StartRecScreen(string path)
  
      {
  
         btn_screenRecord.Text = "Stop";
  
         this.SetScreenArea();
  
        _isRecording = true;
  
         string fullName = string.Format(@"{0}\{1}_{2}.mp4", path, "Record_", DateTime.Now.ToString("d_MMM_yyyy_HH_mm_ssff"));
  
  
  
              // Save File option
  
              _Screenwriter.Open(
  
                  fullName,
  
                  this._Screenwidth,
  
                  this._Screenheight,
  
                  10, VideoCodec.MPEG4, 1000000);
  
              // create screen capture video source
  
              this._streamVideo = new ScreenCaptureStream(this._screenArea);
  
  
  
              // set NewFrame event handler
  
              this._streamVideo.NewFrame += new NewFrameEventHandler(this.video_NewScreenFrame);
  
  
  
              // start the video source
  
              this._streamVideo.Start();
  
  
  
      }
  
      private void video_NewScreenFrame(object sender, NewFrameEventArgs eventArgs)
  
      {
  
          if (this._isScreenRecording)
  
          {              
  
              this._Screenwriter.WriteVideoFrame(eventArgs.Frame);             
  
          }
  
          else
  
          {             
  
              _streamVideo.SignalToStop();             
  
              _Screenwriter.Close();
  
          }
  
      }
  
  
  
      private void SetScreenArea()
  
      {
  
          // get entire desktop area size
  
          foreach (Screen screen in Screen.AllScreens)
  
          {
  
              this._screenArea = Rectangle.Union(_screenArea, screen.Bounds);
  
          }
  
      }

• swscale/output : Add rgba64/rgb48/bgra64/bgr48 output functions with full chroma inter...

  17 juin 2015, par Michael Niedermayer

  swscale/output : Add rgba64/rgb48/bgra64/bgr48 output functions with full chroma interpolation
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libswscale/output.c
  • [DH] libswscale/utils.c
  • [DH] tests/ref/fate/filter-pixfmts-scale

• Android : How to make camera capture video only of preview size and not full screen ?

  13 décembre 2017, par Ashutosh Tiwari

  I am working on an app that needs to capture square videos just like Instagram. I used many libraries for the purpose but none helped to capture the video itself in square size. I can make the preview look like square but not the recorded video. For that I have to use FFMPEG library for cropping the video after it has been captured. But this process takes too long for 1 minute videos even with 480p video capture quality. Someone please guide me to achieve this task.

  Libraries that I have used are :
  https://github.com/natario1/CameraView for cameraView and http://writingminds.github.io/ffmpeg-android-java/ for using ffmpeg.

  Commands that I have tried for ffmpeg cropping operation are :

  command = new String[]{"-y",
  
                  "-f",
  
                  "concat",
  
                  "-safe",
  
                  "0",
  
                  "-i",
  
                  "" + sdCardPathFile,
  
                  "-c:v",
  
                  "libx264",
  
                  "-vf",
  
                  "crop=" + getVideoResolution(),
  
                  "-preset",
  
                  "ultrafast",
  
                  "-qscale",
  
                  "0",
  
                  "-crf",
  
                  "28",
  
                  "-c:a",
  
                  "copy",
  
                  "-flags",
  
                  "+global_header",
  
                  "" + joinedVideoFile.getAbsolutePath()
  
          };
  
  
  
  
  
  
  
  
  
  String[] joinCommand = new String[]{
  
                  "-y",
  
                  "-f",
  
                  "concat",
  
                  "-safe",
  
                  "0",
  
                  "-i",
  
                  "" + sdCardPathFile,
  
                  "-filter:v",
  
                  "crop=480:480",
  
                  "-preset",
  
                  "superfast",
  
                  "-c:a",
  
                  "copy",
  
                  "" + joinedVideoFile.getAbsolutePath()
  
          };