title: Error while capturing video via RTSP from a network camera using OpenCV and FFMPEG
body: <p>I am using OpenCV and FFMPEG to capture frames from a network camera using RTSP. The point is that OpenCV successfully loads the FFMPEG .dll but icvCreateFileCapture_FFMPEG_p returns false in the following code of cap_ffmpeg.cpp:</p>
  
  <pre><code>virtual bool open( const char* filename )
  {
      close();
  
      icvInitFFMPEG();
      if( !icvCreateFileCapture_FFMPEG_p )
          return false;
      ffmpegCapture = icvCreateFileCapture_FFMPEG_p( filename );
      return ffmpegCapture != 0;
  }
  </code></pre>