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• NReco.VideoConverter.ConvertLiveMedia

  12 décembre 2022, par Psychosocial

  I get an exception when trying to write a raw image to ConvertLiveMedia :
  

  


  


  System.IO.IOException : "Канал был закрыт.

  


  System.IO.IOException : "The channel has been closed."

  


  


  var ffMpeg = new NReco.VideoConverter.FFMpegConverter();
var frame = Bitmap.FromFile("source.jpg");
var bytes = ImageToByte(frame);

using (var fs = new FileStream("output.mp4", FileMode.Create))
{
    var mediaTask = ffMpeg.ConvertLiveMedia(Format.raw_video, fs, Format.mp4, new ConvertSettings()
    {                    
    });
    
    mediaTask.Start();

    for (int f = 0; f < frames; f++)
    {
        mediaTask.Write(bytes, 0, bytes.Length);  //exception here channel was closed
    }
    mediaTask.Stop();
}


  


• [FFmpeg on Windows] : help me converting a set of .png files to a video file

  31 octobre 2016, par Stefano Fedele

  Hi everybody I am on windows 10, I installed FFMpeg and I would like to use it to convert 100 .png image files into a video file.

  I am using it via the prompt, which is the Windows console, and I am struggling with the syntax (which probability comes from Linux). I set the folder in which ffmpeg.exe is contained as a windows system path as suggested on many websites and I moved the prompt to the folders in which the image files are contained which is reported here :

  cd C:\video\pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain

  I would like to convert the image files contained in this folder into a video file, the names of those image files are reported here :

  pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain 20 001.png

  pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain 20 002.png

  ...

  ...

  pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain 20 100.png

  The number of frames per second whould be 2.

  I read on internet that I should have to type something like this

  ffmpeg -i image-%03d.png video.webm

  But it looks like there are a lot of variables to consider and all the times I try to set them and run FFmpeg I get an error from the prompt.
  Is there anyone who could suggest me the proper syntax, please ?

• Get RGB values from AVPicture and change to grey-scale in FFMPEG

  22 octobre 2014, par user2742299

  The main motive of my code is to change the RGB values from the AVPicture in FFMPEG.

  I have been able to get the image data "data[0]" by following the article : http://blog.tomaka17.com/2012/03/libavcodeclibavformat-tutorial/

  I would like to know that how can I access the 3 bytes of pic.data[0] which is in RGB format. I have been trying to access the pic.data[i][j] via for-loop in 2D matrix fashion but jth element>3.

  Any guidance in this regard will be helpful.

  Code is here :

  AVPicture pic;
  
          avpicture_alloc(&pic, PIX_FMT_RGB24, mpAVFrameInput->width,mpAVFrameInput->height);
  
          auto ctxt = sws_getContext(mpAVFrameInput->width,mpAVFrameInput->height,static_cast<pixelformat>(mpAVFrameInput->format),
  
              mpAVFrameInput->width, mpAVFrameInput->height, PIX_FMT_RGB24, SWS_BILINEAR, nullptr, nullptr, nullptr);
  
  
  
          if (ctxt == nullptr)
  
              throw std::runtime_error("Error while calling sws_getContext");
  
          sws_scale(ctxt, mpAVFrameInput->data, mpAVFrameInput->linesize, 0, mpAVFrameInput->height, pic.data,
  
              pic.linesize);
  
  
  
  
  
      for (int i = 0; i &lt; (mpAVFrameInput->height-1); i++) {
  
  
  
          for (int j = 0;  j &lt; (mpAVFrameInput->width-1); j++) {
  
          printf("\n value: %d",pic.data[0][j]);
  
  
  
          }
  
  
  
      }
  
  </pixelformat>

  Pseudo code which is in my mind is :

  For each pixel in image {
  
  Red = pic.data[i][j].pixel.RED;
  
  Green = pic.data[i][j].pixel.GREEN;
  
  Blue = pic.data[i][j].pixel.BLUE;
  
  GRAY = (Red+Green+Blue)/3;
  
  Red = GRAY;
  
  Green = GRAY;
  
  Blue = GRAY;
  
  Save Frame;}

  I am quite new to FFMPEG therefore any guidance and help will be highly appreciable.

  Many Thanks