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• Amazon S3 : how to combine all images into a video ?

  9 septembre 2021, par scientiffic

  I'm in my Rails app, I enable users to upload images, which get processed using ffmpeg to create a video slideshow.

  



  I have this working locally, but am wondering how to do this when deploying the app using Heroku. In particular, I know Heroku has limited storage and has a read-only filesystem, so using Carrierwave without S3 or an external storage option doesn't seem like an option.

  



  But how would I run a task like the following using S3, where I combine all images into a video ?

  



  The ffmpeg command is

  



  ffmpeg -r 5 -i https://s3.amazonaws.com/[]/uploads/image/image_file/26/img%03d.jpg output.mp4 -y


  



  And the AWS "folder" contains the following :
https://s3.amazonaws.com/[]/uploads/image/image_file/26/img001.jpg
https://s3.amazonaws.com/[]/uploads/image/image_file/26/img002.jpg
https://s3.amazonaws.com/[]/uploads/image/image_file/26/img003.jpg

  



  When I try to do the following, I get an error with ffmpeg not knowing what to do with :

  



  https://s3.amazonaws.com/[]/uploads/image/image_file/26/img%03d.jpg


  



  Note, this whole video compilation process works fine for me locally, so I know in theory it should work.

  


• Amazon S3 : how to combine all images into a video ?

  17 mars 2015, par scientiffic

  I’m in my Rails app, I enable users to upload images, which get processed using ffmpeg to create a video slideshow.

  I have this working locally, but am wondering how to do this when deploying the app using Heroku. In particular, I know Heroku has limited storage and has a read-only filesystem, so using Carrierwave without S3 or an external storage option doesn’t seem like an option.

  But how would I run a task like the following using S3, where I combine all images into a video ?

  The ffmpeg command is

  ffmpeg -r 5 -i https://s3.amazonaws.com/[]/uploads/image/image_file/26/img%03d.jpg output.mp4 -y

  And the AWS "folder" contains the following :
  https://s3.amazonaws.com/[]/uploads/image/image_file/26/img001.jpg
  https://s3.amazonaws.com/[]/uploads/image/image_file/26/img002.jpg
  https://s3.amazonaws.com/[]/uploads/image/image_file/26/img003.jpg

  When I try to do the following, I get an error with ffmpeg not knowing what to do with :

  https://s3.amazonaws.com/[]/uploads/image/image_file/26/img%03d.jpg

  Note, this whole video compilation process works fine for me locally, so I know in theory it should work.

• 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>