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• Opencv mask object from rtsp camera

  19 août 2016, par user3689259

  i want to add an image as mask in camera live frame after detect specific logo .
  if possible Output rtmp ://127.0.0.1:1935/live/mycamOutput ,, I have nginx-rtmp the rtmp can work if we add it in source , pls any one can help me

  //opencv
  
  #include "opencv2/imgcodecs.hpp"
  
  #include "opencv2/imgproc.hpp"
  
  #include "opencv2/videoio.hpp"
  
  #include <opencv2></opencv2>highgui.hpp>
  
  #include <opencv2></opencv2>video.hpp>
  
  //C
  
  #include 
  
  //C++
  
  #include <iostream>
  
  #include <sstream>
  
  
  
  using namespace cv;
  
  using namespace std;
  
  
  
  // Global variables
  
  Mat frame; //current frame
  
  Mat fgMaskMOG2; //fg mask fg mask generated by MOG2 method
  
  Ptr<backgroundsubtractor> pMOG2; //MOG2 Background subtractor
  
  int keyboard; //input from keyboard
  
  
  
  /** Function Headers */
  
  void help();
  
  void processVideo(char* videoFilename);
  
  void processImages(char* firstFrameFilename);
  
  
  
  void help()
  
  {
  
      cout
  
      &lt;&lt; "--------------------------------------------------------------------------" &lt;&lt; endl
  
      &lt;&lt; "This program shows how to use background subtraction methods provided by "  &lt;&lt; endl
  
      &lt;&lt; " OpenCV. You can process both videos (-vid) and images (-img)."             &lt;&lt; endl
  
                                                                                      &lt;&lt; endl
  
      &lt;&lt; "Usage:"                                                                     &lt;&lt; endl
  
      &lt;&lt; "./bg_sub {-vid <video filename="filename">|-img <image filename="filename">}"                     &lt;&lt; endl
  
      &lt;&lt; "for example: ./bg_sub -vid video.avi"                                       &lt;&lt; endl
  
      &lt;&lt; "or: ./bg_sub -img /data/images/1.png"                                       &lt;&lt; endl
  
      &lt;&lt; "--------------------------------------------------------------------------" &lt;&lt; endl
  
      &lt;&lt; endl;
  
  }
  
  
  
  /**
  
   * @function main
  
   */
  
  int main(int argc, char* argv[])
  
  {
  
      //print help information
  
      help();
  
  
  
      //check for the input parameter correctness
  
      if(argc != 3) {
  
          cerr &lt;&lt;"Incorret input list" &lt;&lt; endl;
  
          cerr &lt;&lt;"exiting..." &lt;&lt; endl;
  
          return EXIT_FAILURE;
  
      }
  
  
  
      //create GUI windows
  
      namedWindow("Frame");
  
      namedWindow("FG Mask MOG 2");
  
  
  
      //create Background Subtractor objects
  
      pMOG2 = createBackgroundSubtractorMOG2(); //MOG2 approach
  
  
  
      if(strcmp(argv[1], "-vid") == 0) {
  
          //input data coming from a video
  
          processVideo(argv[2]);
  
      }
  
      else if(strcmp(argv[1], "-img") == 0) {
  
          //input data coming from a sequence of images
  
          processImages(argv[2]);
  
      }
  
      else {
  
          //error in reading input parameters
  
          cerr &lt;&lt;"Please, check the input parameters." &lt;&lt; endl;
  
          cerr &lt;&lt;"Exiting..." &lt;&lt; endl;
  
          return EXIT_FAILURE;
  
      }
  
      //destroy GUI windows
  
      destroyAllWindows();
  
      return EXIT_SUCCESS;
  
  }
  
  
  
  /**
  
   * @function processVideo
  
   */
  
  void processVideo(char* videoFilename) {
  
      //create the capture object
  
      VideoCapture capture(videoFilename);
  
      if(!capture.isOpened()){
  
          //error in opening the video input
  
          cerr &lt;&lt; "Unable to open video file: " &lt;&lt; videoFilename &lt;&lt; endl;
  
          exit(EXIT_FAILURE);
  
      }
  
      //read input data. ESC or 'q' for quitting
  
      while( (char)keyboard != 'q' &amp;&amp; (char)keyboard != 27 ){
  
          //read the current frame
  
          if(!capture.read(frame)) {
  
              cerr &lt;&lt; "Unable to read next frame." &lt;&lt; endl;
  
              cerr &lt;&lt; "Exiting..." &lt;&lt; endl;
  
              exit(EXIT_FAILURE);
  
          }
  
          //update the background model
  
          pMOG2->apply(frame, fgMaskMOG2);
  
          //get the frame number and write it on the current frame
  
          stringstream ss;
  
          rectangle(frame, cv::Point(10, 2), cv::Point(100,20),
  
                    cv::Scalar(255,255,255), -1);
  
          ss &lt;&lt; capture.get(CAP_PROP_POS_FRAMES);
  
          string frameNumberString = ss.str();
  
          putText(frame, frameNumberString.c_str(), cv::Point(15, 15),
  
                  FONT_HERSHEY_SIMPLEX, 0.5 , cv::Scalar(0,0,0));
  
          //show the current frame and the fg masks
  
          imshow("Frame", frame);
  
          imshow("FG Mask MOG 2", fgMaskMOG2);
  
          //get the input from the keyboard
  
          keyboard = waitKey( 30 );
  
      }
  
      //delete capture object
  
      capture.release();
  
  }
  
  
  
  /**
  
   * @function processImages
  
   */
  
  void processImages(char* fistFrameFilename) {
  
      //read the first file of the sequence
  
      frame = imread(fistFrameFilename);
  
      if(frame.empty()){
  
          //error in opening the first image
  
          cerr &lt;&lt; "Unable to open first image frame: " &lt;&lt; fistFrameFilename &lt;&lt; endl;
  
          exit(EXIT_FAILURE);
  
      }
  
      //current image filename
  
      string fn(fistFrameFilename);
  
      //read input data. ESC or 'q' for quitting
  
      while( (char)keyboard != 'q' &amp;&amp; (char)keyboard != 27 ){
  
          //update the background model
  
          pMOG2->apply(frame, fgMaskMOG2);
  
          //get the frame number and write it on the current frame
  
          size_t index = fn.find_last_of("/");
  
          if(index == string::npos) {
  
              index = fn.find_last_of("\\");
  
          }
  
          size_t index2 = fn.find_last_of(".");
  
          string prefix = fn.substr(0,index+1);
  
          string suffix = fn.substr(index2);
  
          string frameNumberString = fn.substr(index+1, index2-index-1);
  
          istringstream iss(frameNumberString);
  
          int frameNumber = 0;
  
          iss >> frameNumber;
  
          rectangle(frame, cv::Point(10, 2), cv::Point(100,20),
  
                    cv::Scalar(255,255,255), -1);
  
          putText(frame, frameNumberString.c_str(), cv::Point(15, 15),
  
                  FONT_HERSHEY_SIMPLEX, 0.5 , cv::Scalar(0,0,0));
  
          //show the current frame and the fg masks
  
          imshow("Frame", frame);
  
          imshow("FG Mask MOG 2", fgMaskMOG2);
  
          //get the input from the keyboard
  
          keyboard = waitKey( 30 );
  
          //search for the next image in the sequence
  
          ostringstream oss;
  
          oss &lt;&lt; (frameNumber + 1);
  
          string nextFrameNumberString = oss.str();
  
          string nextFrameFilename = prefix + nextFrameNumberString + suffix;
  
          //read the next frame
  
          frame = imread(nextFrameFilename);
  
          if(frame.empty()){
  
              //error in opening the next image in the sequence
  
              cerr &lt;&lt; "Unable to open image frame: " &lt;&lt; nextFrameFilename &lt;&lt; endl;
  
              exit(EXIT_FAILURE);
  
          }
  
          //update the path of the current frame
  
          fn.assign(nextFrameFilename);
  
      }
  
  }
  
  </image></video></backgroundsubtractor></sstream></iostream>

• Approaches To Modifying Game Resource Files

  16 août 2016, par Multimedia Mike — Game Hacking

  I have been assisting The Translator in the translation of another mid-1990s adventure game. This one isn’t quite as multimedia-heavy as the last title, and the challenges are a bit different. I wanted to compose this post in order to describe my thought process and mental model in approaching this problem. Hopefully, this will help some others understand my approach since what I’m doing here often appears as magic to some of my correspondents.

  High Level Model
  At the highest level, it is valuable to understand the code and the data at play. The code is the game’s engine and the data refers to the collection of resources that comprise the game’s graphics, sound, text, and other assets.

  
  
  Simplistic high-level game engine model
  

  Ideally, we want to change the data in such a way that the original game engine adopts it as its own because it has the same format as the original data. It is very undesirable to have to modify the binary engine executable in any way.

  Modifying The Game Data Directly
  How to modify the data ? If we modify the text strings for the sake of language translation, one approach might be to search for strings within the game data files and change them directly. This model assumes that the text strings are stored in a plain, uncompressed format. Some games might store these strings in a text format which can be easily edited with any text editor. Other games will store them as binary data.
  

  In the latter situation, a game hacker can scan through data files with utilities like Unix ‘strings’ to find the resources with the desired strings. Then, use a hex editor to edit the strings directly. For example, change “Original String”…

  0098F800   00 00 00 00  00 00 00 4F  72 69 67 69  6E 61 6C 20  .......Original 
  0098F810   53 74 72 69  6E 67 00 00  00 00 00 00  00 00 00 00  String..........
  

  …to “Short String” and pad the difference in string lengths using spaces (0x20) :

  0098F800   00 00 00 00  00 00 00 53  68 6F 72 74  20 53 74 72  .......Short Str
  0098F810   69 6E 67 20  20 20 00 00  00 00 00 00  00 00 00 00  ing   ..........
  

  This has some obvious problems. First, translated strings need to be of equal our smaller length compared to the original. What if we want to encode “Much Longer String” ?

  0098F800   00 00 00 00  00 00 00 4D  75 63 68 20  4C 6F 6E 67  .......Much Long
  0098F810   65 72 20 53  74 72 00 00  00 00 00 00  00 00 00 00  er Str..........
  

  It won’t fit. The second problem pertains to character set limitations. If the font in use was only designed for ASCII, it’s going to be inadequate for expressing nearly any other language.

  So a better approach is needed.

  Understanding The Data Structures
  An alternative to the approach outlined above is to understand the game’s resources so they can be modified at a deeper level. Here’s a model to motivate this investigation :

  
  
  Model of the game resource archive format
  

  This is a very common layout for such formats : there is a file header, a sequence of resource blocks, and a trailing index which describes the locations and types of the foregoing blocks.

  What use is understanding the data structures ? In doing so, it becomes possible to write new utilities that disassemble the data into individual pieces, modify the necessary pieces, and then reassemble them into a form that the original game engine likes.

  It’s important to take a careful, experimental approach to this since mistakes can be ruthlessly difficult to debug (unless you relish the thought of debugging the control flow through an opaque DOS executable). Thus, the very first goal in all of this is to create a program that can disassemble and reassemble the resource, thus creating an identical resource file. This diagram illustrates this complex initial process :

  
  
  Rewriting the game resource file
  

  So, yeah, this is one of the most complicated “copy file” operations that I can possibly code. But it forms an important basis, since the next step is to carefully replace one piece at a time.

  
  
  Modifying a specific game resource
  

  This diagram shows a simplistic model of a resource block that contains a series of message strings. The header contains pointers to each of the strings within the block. Instead of copying this particular resource block directly to the new file, a proposed modification utility will intercept it and rewrite the entire thing, writing new strings of arbitrary length and creating an adjusted header which will correctly point to the start of each new string. Thus, translated strings can be longer than the original strings.

  Further Work
  Exploiting this same approach, we can intercept and modify other game resources including fonts, images, and anything else that might need to be translated. I will explore specific examples in a later blog post.

  Followup

  • Translating Return to Ringworld, in which I apply the ideas expressed in this post.

• MVC - Audio Convert file from M4A to MP3

  17 octobre 2016, par Matheus Miranda

  In my application I upload an audio file type MP4 from a windows explorer and save it in data base SQL in field VARBINARY. It is OK. I would like to convert it to MP3 before insert in my DB, for these I am using a FFMPEG but i am not able to get success. Can anybody help me ?

  Below is the screenshot where we can see the file and type in my application.

  

  Is possible to use a FFMPEG reading the file directly from MODEL ? Parameter : FileName ?

  What is the best way to convert a audio file as mentioned above via MVC program ?

  Thanks for any suggestion or help.

  Best Regards,