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• ffmpeg : record/capture stream and do scene detection at the same time

  2 août 2022, par AnodeCathode

  Is it possible to both capture (record) an RTSP stream and capture scene change events using a single ffmpeg command ? I can almost do what I want with :

  



  ffmpeg -i 'rtsp://mystream' \
-map 0:v -map 0:a -c:v copy -c:a copy -f segment \
-segment_time 300 -segment_format matroska -strftime 1 "%Y%m%d%H%M%S_video.mkv" \
-map 0:v -an -filter:v "select='gt(scene,0.1)'" -frames:v 1 "%Y%m%d%H%M%S_scenechange.png"


  



  This gives me nice 300s stream segments saved to disk, and a scene.png when a scene change is detected. However, scene.png only appears when I terminate the process, and when I do, I only get the last scene event. Ideally I'd like to get a new PNG (or even better, a short video clip) anytime a scene change is detected, without interrupting the recording of video.mkv. I'm sure it can be done with pipes and multiple ffmpeg commands, but for simplicity's sake (and mostly my own curiosity at this point), I'd like to see what can be done with just a single process.

  


• Record and preview webcamera stream at the same time

  11 juin 2019, par Vlad Popov

  I’m using ffmpeg and Windows 7/10 OS and going to save webcamera stream to file and preview it at the same time (from time to time, not constantly).
  I can solve each of these tasks separately :

  1. Saving webcamera stream to 1-minute files :

  $ffmpeg_exe = "C:\ffmpeg.exe"

  $video_source = "USB Video Device"

  Start-Process $ffmpeg_exe -ArgumentList @("-y -hide_banner -f dshow -rtbufsize 100M -i video=``"$video_source``" -preset ultrafast -strftime 1 -f segment -segment_time 00:01:00 ``"$out_folder\%Y_%m_%d_%H_%M_%S.mp4``"") -Wait -NoNewWindow

  2. Preview webcamera using ffplay :

  $ffplay_exe = "C:\ffplay.exe"

  Start-Process $ffplay_exe -ArgumentList @("-hide_banner -f dshow -i video=``"$video_source``" -preset ultrafast") -Wait -NoNewWindow

  Is there a way to do it using single command ? I think I have to use ffmpeg within named pipes but I don’t understand how to create/operate them. Maybe someone have already working Windows command which will 1) save webcamera video to file 2) also send it to named pipe for another applications like ffplay or VLC ?

  Thanks for your answers,

  —Vlad

• How can I record audio along with Aforge player video recording ?

  4 juin 2019, par H.NS

  My app is playing webcam video using Aforge Plyer. Now I want to record this video. Using Aforge player audio recording is not possible.

  Is there any way to record audio separately and merge it with recorded video using Aforge player ?

  Found that using Direct Show architecture is the way to achieve this. But it will be very difficult to change the architecture at the last time of development. Since I’m unaware with directshow concepts and almost 90 percentage of my project is completed with Aforge player.

  My current code is here. It can record video from selected webcam using aforge player. But audio is missing

  using AForge.Video;
  
  using AForge.Video.DirectShow;
  
  using Accord.Video.FFMPEG;
  
  
  
      private FilterInfoCollection VideoCaptureDevices;
  
      private VideoCaptureDevice FinalVideo = null;
  
      private VideoCaptureDeviceForm captureDevice;
  
      private Bitmap video;
  
      private VideoFileWriter FileWriter = new VideoFileWriter();
  
      private SaveFileDialog saveAvi;
  
  
  
      private void VideoRecord_Load(object sender, EventArgs e)
  
      {
  
          VideoCaptureDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
  
          captureDevice = new VideoCaptureDeviceForm();
  
      }
  
      private void play_Click(object sender, EventArgs e)
  
      {
  
          if (captureDevice.ShowDialog(this) == DialogResult.OK)
  
          {
  
              VideoCaptureDevice videoSource = captureDevice.VideoDevice;
  
              FinalVideo = captureDevice.VideoDevice;
  
              FinalVideo.NewFrame += new NewFrameEventHandler(FinalVideo_NewFrame);
  
              FinalVideo.Start();
  
          }
  
      }
  
      void FinalVideo_NewFrame(object sender, NewFrameEventArgs eventArgs)
  
      {
  
          if (butStop.Text == "Stop Record")
  
          {
  
              video = (Bitmap)eventArgs.Frame.Clone();
  
              FileWriter.WriteVideoFrame(video);
  
          }
  
          else
  
          {
  
              video = (Bitmap)eventArgs.Frame.Clone();;
  
          }
  
      }
  
      private void Record_Click(object sender, EventArgs e)
  
      {
  
          saveAvi = new SaveFileDialog();
  
          saveAvi.Filter = "Avi Files (*.avi)|*.avi";
  
          if (saveAvi.ShowDialog() == System.Windows.Forms.DialogResult.OK)
  
          {
  
              int h = captureDevice.VideoDevice.VideoResolution.FrameSize.Height;
  
              int w = captureDevice.VideoDevice.VideoResolution.FrameSize.Width;
  
              FileWriter.Open(saveAvi.FileName, w, h, 25, VideoCodec.Default, 5000000);
  
              FileWriter.WriteVideoFrame(video);
  
              butStop.Text = "Stop Record";
  
          }
  
      }
  
      private void stopRecord_Click(object sender, EventArgs e)
  
      {
  
          if (butStop.Text == "Stop Record")
  
          {
  
              butStop.Text = "Stop";
  
              if (FinalVideo == null)
  
              { return; }
  
              if (FinalVideo.IsRunning)
  
              {
  
                  FileWriter.Close();
  
              }
  
          }
  
          else
  
          {
  
              this.FinalVideo.Stop();
  
              FileWriter.Close();
  
          }
  
      }
  
  }
  
  }