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• Image mask blur processing problem using ffmpeg

  16 avril 2024, par andrew kim

  I want to apply blur using masking to two or more points in the image. I want to use a circular or other type of blur in ffmpeg rather than a box blur. I wrote the ffmpeg code, but an error continued. When there is only one blur, it works correctly, but when there are two or more blurs, an error occurs. No matter how much I search, I can't figure it out, so I'd like to ask for help.

  


  The ffmpeg code I wrote is as follows.

  


  ffmpeg -i input.mp4 -i mask.png -filter_complex "`
[1:v]scale=200:200,pad=1920:1080:(ow-iw)/1:(oh-ih)/1[pmask1]; `
[1:v]scale=200:200,pad=1920:1080:(ow-iw)/3:(oh-ih)/3[pmask2]; `
[0:v][pmask1]alphamerge,avgblur=10[alf];[0:v][alf]overlay[temp1]; `
[temp1][pmask2]alphamerge,avgblur=10[alf2];[temp1][alf2]overlay[v] `
"-map "[v]" -map 0:a -c:v libx264 -c:a copy -movflags +faststart maskedblur.mp4


  


  The error is as follows.

  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0000026ed1d4a500] Invalid stream specifier: temp1.
    Last message repeated 1 times
[fc#0 @ 0000026ed1cdc280] Stream specifier 'temp1' in filtergraph description
[1:v]scale=200:200,pad=1920:1080:(ow-iw)/1:(oh-ih)/1[pmask1];
[1:v]scale=200:200,pad=1920:1080:(ow-iw)/3:(oh-ih)/3[pmask2];
[0:v][pmask1]alphamerge,avgblur=10[alf];[0:v][alf]overlay[temp1];
[temp1][pmask2]alphamerge,avgblur=10[alf2];[temp1][alf2]overlay[v]
 matches no streams.
Error initializing complex filters: Invalid argument


  


• Revision 8b175679be : Masking intra mode choice adaptively The commit changes to mask available intra

  11 octobre 2013, par Yaowu Xu

  Changed Paths :
   Modify /vp9/encoder/vp9_onyx_if.c

  
   Modify /vp9/encoder/vp9_onyx_int.h

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Masking intra mode choice adaptively

  The commit changes to mask available intra prediction modes for test
  based on prediction block size.

  With this patch, encoding time of CpuUsed 2 reduces from 10% to 20% for
  HD clips with a compression drop of 0.2%

  Change-Id : I65f320f1237c0f5ae3a355bf7caf447f55625455

• 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>