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• Applying the same filter many times before output [duplicate]

  19 août 2019, par Fabián

  This question already has an answer here :

  • FFmpeg command to apply multiple filters and limit the final file size [closed]
    
    1 answer
    

  In my video there’s an object that has shades of yellow (more orange-like) and has a solid yellow as background.
  I need to output all frames into a png sequence, using a color key filter to replace the yellow from the background :

  ffmpeg -ss 4 -i original.mp4 -t 2 -filter_complex "[0:v]colorkey=0xfff31b:0.125:0[ckout]" -map "[ckout]" colorkey-%d.png

  This removes all the yellow background. However, it leaves some pints of yellow behind, and some items are yellow-themed, so blending isn’t an option for this scenario.

  In the end I need to get rid of 4 specific yellow-colors from the frames : 0xfff31b, 0xfae56b, 0xfaec46 and 0xeee2a0. My idea is to run the same filter for every color.

  So first I tried this :

  ffmpeg -ss 4 -i original.mp4 -t 2 -filter_complex "[0:v]colorkey=0xfff31b:0.4:0[ckout1];[0:v]colorkey=0xfae56b:0.4:0[ckout2];[0:v]colorkey=0xfaec46:0.4:0[ckout3];[0:v]colorkey=0xeee2a0:0.4:0[ckout4]" -map "[ckout4]" colorkeyrefined-%d.png

  Then this :

  ffmpeg -ss 4 -i original.mp4 -t 2 -filter_complex "[0:v]colorkey=0xfff31b:0.4:0[ckout]" -filter_complex "[0:v]colorkey=0xfae56b:0.4:0[ckout]" -filter_complex "[0:v]colorkey=0xfaec46:0.4:0[ckout]" -filter_complex "[0:v]colorkey=0xeee2a0:0.4:0[ckout]" -map "[ckout]" colorkeyrefined-%d.png

  But both display the same error :

  Filter colorkey has an unconnected output.

  Is there a way to apply the colorkey 4 times (with the mentioned values) in one go ?

• ffmpeg zoompan, zoom to positions X Y

  15 juillet 2021, par MIQUEL CASTRO NAVARRO

  Hi im using ffmpeg to zoom an image to specific point x, y. I want the points x,y to be the final position of the zoom the comand I have right now is :

  


  ffmpeg -y -i zoomInimg.jpg -vf "scale=6198:2350:-1,zoompan=z='min(max(zoom,pzoom)+0.06,10)':d=2400:x=4000 :y=1000 :s=6198x2350" -t 5 zoomIn.mp4


  


  so i want the image to end in points x=4000:y=1000
Is there a formula to do that ?

  


• IplImage crop and rotate - Android

  26 février 2015, par Ganesh

  I’m using ffmpeg to video capture for 30 seconds.

  @Override
  
          public void onPreviewFrame(byte[] data, Camera camera) {
  
              if (yuvIplimage != null && recording && rec) 
  
                  {
  
                      new SaveFrame().execute(data);
  
                  }
  
              }
  
          }

  save frame class is below

  private class SaveFrame extends AsyncTask {
  
              long t;
  
              protected File doInBackground(byte[]... arg) {
  
  
  
                  t = 1000 * (System.currentTimeMillis() - firstTime - pausedTime);
  
                  toSaveFrames++;
  
                  File pathCache = new File(Environment.getExternalStorageDirectory()+"/DCIM", (System.currentTimeMillis() / 1000L)+ "_" + toSaveFrames + ".tmp");
  
                  BufferedOutputStream bos;
  
                  try {
  
                      bos = new BufferedOutputStream(new FileOutputStream(pathCache));
  
                      bos.write(arg[0]);
  
                      bos.flush();
  
                      bos.close();
  
                  } catch (FileNotFoundException e) {
  
                      e.printStackTrace();
  
                      pathCache = null;
  
                      toSaveFrames--;
  
                  } catch (IOException e) {
  
                      e.printStackTrace();
  
                      pathCache = null;
  
                      toSaveFrames--;
  
                  }
  
                  return pathCache;
  
  
  
  
  
              }
  
              @Override
  
              protected void onPostExecute(File filename)
  
              {
  
                  if(filename!=null)
  
                  {
  
                      savedFrames++;
  
                      tempList.add(new FileFrame(t,filename));
  
                  }
  
              }
  
          }

  finally i add all frames with crop and rotation

  private class AddFrame extends AsyncTask {
  
          private int serial = 0;
  
          @Override
  
          protected Void doInBackground(Void... params) {
  
  
  
              for(int i=0; i/                                      final int startY = 640*(480-480)/2;
  
  //                                      final int lenY = 640*480;
  
  //                                      yuvIplimage.getByteBuffer().put(bytes, startY, lenY);
  
  //                                      final int startVU = 640*480+ 640*(480-480)/4;
  
  //                                      final int lenVU = 640* 480/2;
  
  //                                      yuvIplimage.getByteBuffer().put(bytes, startVU, lenVU);
  
  
  
                      if (tempList.get(i).time > recorder.getTimestamp()) {
  
                          recorder.setTimestamp(tempList.get(i).time);
  
                      }
  
  
  
                      image = cropImage(image);
  
                      image = rotate(image, 270);
  
  //                                       image = rotateImage(image);
  
                      recorder.record(image);
  
                      Log.i(LOG_TAG, "record " + i);
  
                      image = null;
  
                      serial++;
  
                      publishProgress(serial);
  
                  } catch (FileNotFoundException e) {
  
                      e.printStackTrace();
  
                  } catch (IOException e) {
  
                      e.printStackTrace();
  
                  } catch (com.googlecode.javacv.FrameRecorder.Exception e) {
  
                      e.printStackTrace();
  
                  }
  
              }
  
              return null;
  
          }
  
          @Override
  
          protected void onProgressUpdate(Integer... serial) {
  
              int value = serial[0];
  
              creatingProgress.setProgress(value);
  
          }
  
          @Override
  
          protected void onPostExecute(Void v)
  
          {
  
              creatingProgress.dismiss();
  
              if (recorder != null && recording) {
  
                  recording = false;
  
                  Log.v(LOG_TAG,"Finishing recording, calling stop and release on recorder");
  
                  try {
  
                      recorder.stop();
  
                      recorder.release();
  
                      finish();
  
                      startActivity(new Intent(RecordActivity.this,AnswerViewActivity.class));
  
                  } catch (FFmpegFrameRecorder.Exception e) {
  
                      e.printStackTrace();
  
                  }
  
                  recorder = null;
  
              }
  
          }
  
      }

  my crop and rotate method are below

  private IplImage cropImage(IplImage src)
  
      {
  
          cvSetImageROI(src, r);
  
          IplImage cropped = IplImage.create(imageHeight, imageHeight, IPL_DEPTH_8U, 2);
  
          cvCopy(src, cropped);
  
          return cropped;
  
      }
  
  
  
      public static IplImage rotate(IplImage image, double angle) {        
  
          IplImage copy = opencv_core.cvCloneImage(image);
  
  
  
          IplImage rotatedImage = opencv_core.cvCreateImage(opencv_core.cvGetSize(copy), copy.depth(), copy.nChannels()); 
  
          CvMat mapMatrix = opencv_core.cvCreateMat( 2, 3, opencv_core.CV_32FC1 );
  
  
  
          //Define Mid Point
  
          CvPoint2D32f centerPoint = new CvPoint2D32f();
  
          centerPoint.x(copy.width()/2);
  
          centerPoint.y(copy.height()/2);
  
  
  
          //Get Rotational Matrix
  
          opencv_imgproc.cv2DRotationMatrix(centerPoint, angle, 1.0, mapMatrix);
  
  
  
          //Rotate the Image
  
          opencv_imgproc.cvWarpAffine(copy, rotatedImage, mapMatrix, opencv_imgproc.CV_INTER_CUBIC +  opencv_imgproc.CV_WARP_FILL_OUTLIERS, opencv_core.cvScalarAll(170));
  
          opencv_core.cvReleaseImage(copy);
  
          opencv_core.cvReleaseMat(mapMatrix);        
  
          return rotatedImage;
  
      }

  my final video crop and rotate but green frames and colored frames mixed with this.

  How to fix this problem. I’m not aware of iplimage. In some blogs they mention its YUV format. first u need to convert Y and then convert UV.

  How to solve this problem ?