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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);
  
          }
  
      }

• How to record sound/audio via FFmpeg, Alsa, PulseAudio or Sox without a soundcard (using the commandline)

  13 avril 2019, par Heart Of A Lion

  I’m trying to record audio on an Ubuntu server that has no soundcard or any other audio device. When I use the following Alsa command to list any audio devices, then it can’t find any devices.

  arecord -l

  I’ve tried recording/capturing audio using the following packages, but because there is no soundcard they all fail to record any audio :

  ffmpeg, alsa, pulseaudio, sox

  Now it should be possible to record sound on a server that has no soundcard, as some people have managed to do it. The question is how.

  Can someone give a step by step commandline walk-through of how to do this on an Ubuntu server, so that audio can be recorded on the server using any of the above-mentioned packages ?

• ffmpeg record before and after applying filters

  7 mai 2019, par Mark

  I’m trying to use ffmpeg to do the following things :

  • acquire input streaming [OK]
  • save to disk the video as is [TODO]
  • apply filter, i.e. drawtext [OK]
  • save to disk the overlayed video [OK]
  • preview the overlayed video [OK]

  Here my current command line :

  ffmpeg -rtsp_transport tcp -i  -vf "[in]drawtext=textfile='text.txt': reload=1: font=arial: fontcolor=red: fontsize=80: box=1: boxcolor=yellow@0.5: boxborderw=5: x=(w-text_w)/2: y=(h-text_h)/2[out]" -vcodec libx264 -f tee -map 0:v "[f=mp4]test.mp4|[f=nut]pipe:" | ffplay pipe:

  The only thing I don’t understand how to do is the recording of the video before drawtext. I guess I have to create another tee :

  INPUT ---> TEE ---->RECORD
  
                  |
  
                  |-->FILTERS---> TEE ---->RECORD
  
                                       |
  
                                       |-->PLAY

  So I tried with this cumbersome command :

  ffmpeg -rtsp_transport tcp -i  -vcodec libx264 -f tee -map 0:v "[f=mp4]before.mp4|[f=nut]pipe:" | ffmpeg -f mp4 -i pipe: -vf "[in]drawtext=textfile='text.txt': reload=1: font=arial: fontcolor=red: fontsize=80: box=1: boxcolor=yellow@0.5: boxborderw=5: x=(w-text_w)/2: y=(h-text_h)/2[out]" -vcodec libx264 -f tee -map 0:v "[f=mp4]after.mp4|[f=nut]pipe:" | ffplay pipe:

  It doesn’t throw errors, records "before.mp4" but neither "after.mp4" nor the preview are working. Surely I forgot something in the syntax.