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• ffmpeg not creating a name for image after thumbnail generation

  15 août 2012, par Lynx

  I just learn how to use ASP.NET and learn C# last month and now I am having a problem.
  I am experimenting on how to generate thumbnail using ffmpeg in C#. The thumbnail successfully generated in intended folder but there is no name for the image file.
  what I want to do is to create thumbnail and automatically named the jpg file same as the video file.

  I can't figure out what is wrong with my code ; in fact, I don't understand the code completely as I copied the code from internet and only change the folder path of the files.

  private void generateThumbnails(string filename)
  
  {
  
      string[] setThum = filename.Split('.');
  
      string thumb_path = setThum[0] + ".jpg";
  
      filename = "C:\\ramky\\al.avi";
  
      string thumbpath, thumbname;//, videopath;
  
      string thumbargs, inputfile;
  
      thumbpath = "C:\\ramky\\";
  
      thumbname = thumbpath + thumb_path;
  
      inputfile = filename;
  
      thumbargs = "-i \"" + inputfile + "\" -s 240*150 -ss 1 -vframes 1 -f image2 \"" + thumbname + "\"";
  
  
  
      Process thumbproc = new Process();
  
      thumbproc = new Process();
  
  
  
      thumbproc.StartInfo.FileName = "C:\\ffmpeg\\ffmpeg.exe";
  
      thumbproc.StartInfo.Arguments = thumbargs;
  
      thumbproc.StartInfo.UseShellExecute = false;
  
      thumbproc.StartInfo.CreateNoWindow = true;
  
      thumbproc.StartInfo.RedirectStandardOutput = false;
  
  
  
      try
  
      {
  
          thumbproc.Start();
  
          if (thumbproc != null)
  
          {
  
              thumbproc.Close();
  
          }
  
      }
  
  }

• change position of image overlay on the fly

  16 août 2012, par user1603231

  I need some help on an issue that I am having overlaying images on a live feed.
  Currently, I am streaming raw data from a device, transcoding that data (i.e. ogg) and then re-streaming using HTTP because I need to view through an HTML page. My problem is that I need to overlay an image on the stream where - when a particular object moves - the image overlay moves as well.

  For example, if you wanted to place an 'X' over a moving object where that object may move left-to-right or top-to-bottom. At this point, I am able to overlay the image at a fixed point using the following command :

  ffmpeg -i rtsp ://[host] :[port] -i x.png -filter_complex 'overlay=10:main_h-overlay_h-10' http://[host] :[post]/output.ogg

  This will give me an 'X' over the object at the start but, once the object moves I need to change the position of that 'X'.

  The only real requirement is that the technologies that I utilize need to be available for Linux.

  Any ideas ?

  Thanks !

• Faster Thumbnail/Image Extraction from Video using FFMPEG ?

  27 août 2012, par mirroredAbstraction

  I am using this command to extract a series of images from a video to express them as a visual time-frame of the video.

  ffmpeg -i inputfile.mp4  -r  1  -t  12  image-%d.jpeg

  Most of my videos are in mp4 format. I am able to extract the images successfully but the time taken for extraction is too long.

  Is there any way I could reduce the time for image extraction ?

  EDIT : It is taking me 60 secs to get 8 thumbnails from a 15 sec long video encoded in MP4 format, I am doing this operation on my Galaxy Nexus(Android Phone) is there any way to improve the speed of operation, ideally I want it be less than  10secs.