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• LNK2019 : unresolved external symbol __imp__dclass

  18 avril 2019, par ssk

  I am trying to build ffmpeg on visual studio for ARM architecture. I run into following linker errors :

  Error   58  error LNK2019: unresolved external symbol __imp__dclass referenced in function mov_read_tkhd avformat.lib(mov.o)
  
  
  
  Error   59  error LNK2001: unresolved external symbol __imp__dclass avformat.lib(thp.o) 
  
  
  
  Error   60  error LNK2001: unresolved external symbol __imp__dclass avutil.lib(rational.o)
  
  
  
  Error   61  error LNK2001: unresolved external symbol __imp__dclass avutil.lib(eval.o)

  What is __imp__dclass and where it is defined in Visual Studio / FFMPEG ?

  I get the following when I do "dumpbin /symbols mov.o"

  22D 00000000 UNDEF  notype       External     | __imp__dclass

  Any ideas ?

• 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();
  
          }
  
      }
  
  }
  
  }

• FFMPEG : How to output image2 format into a tcp/udp socket ?

  5 août 2019, par Sagi Mann

  I’ve got ffmpeg to read some RTSP stream and output image2 format to stdout like so :

  ffmpeg -rtsp_transport tcp -i  "rtsp:xxxxx" -f image2 -update 1 -

  But stdout is not good enough for me.. I am trying to pass it to "push" it to some other process that I cannot "pipe" to ffmpeg due to some architecture constraints. I am running on Linux so I was hoping to simulate some tcp/udp socket via the file system e.g. /dev/somthing or similar. Alternatively, maybe it’s possible to get ffmpeg to send the image directly to a given tcp/udp address ? This didn’t work though (ffmpeg expects a file output) :

  ffmpeg -rtsp_transport tcp -i  "rtsp:xxxxx" -f image2 -update 1 "udp://localhost:3333"

  Any ideas ?
  Thanks