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• On-premise analytics demand grows as Google Analytics GDPR uncertainties continue

  7 janvier 2020, par Jake Thornton — Privacy

  The Google Analytics GDPR relationship is a complicated one. Website owners in states like Berlin in Germany are now required to ask users for consent to collect their data. This doesn’t make for the friendliest user-experience and often the website visitor will simply click “no.”

  The problem Google Analytics now presents website owners in the EU is with more visitors clicking “no”, the less accurate your data will become.

  Why do you need to ask your visitors for consent ?

  At this stage it’s simply because Google Analytics collects data for its own purposes. An example of this is using your visitor’s personal data for retargeting purposes across their advertising platforms like Google Ads and YouTube. 

  Google’s Privacy & Terms states : “when you visit a website that uses advertising services like AdSense, including analytics tools like Google Analytics, or embeds video content from YouTube, your web browser automatically sends certain information to Google. This includes the URL of the page you’re visiting and your IP address. We may also set cookies on your browser or read cookies that are already there. Apps that use Google advertising services also share information with Google, such as the name of the app and a unique identifier for advertising.”

  

  The rise of hosting web analytics on-premise

  Managing Google Analytics and GDPR can quickly become complicated, so there’s been an increase in website owners switching from cloud-hosted web analytics platforms, like Google Analytics, to more GDPR compliant alternatives, where you can host web analytics software on your own servers. This is called hosting web analytics on-premise.

  Hosting web analytics on your own servers means :

  No third-parties are involved

  The visitor data your website collects is stored on your own internal infrastructure. This means no third-parties are involved and there’s no risk of personal data being used in the way Google Analytics uses it e.g. sending personal data to its advertising platforms. 

  When you sign up with Google Analytics you sign away control of your user’s personal data. With on-premise website analytics, you own your data and are in full control.

  NOTE : Though Google Analytics uses personal data for its own purposes, not all cloud hosted web analytics platforms do this. As an example, Matomo Analytics Cloud hosted solution states that all personal data collected is not used for its own purposes and that Matomo has no rights in accessing or using this personal data. 

  

  You control where in the world your personal data is stored

  Google Analytics servers are based out of USA, Europe and Asia, so where your personal data will end up is uncertain and you don’t have the option to choose which location it goes to when using free Google Analytics.

  Different countries have different laws when it comes to accessing personal data. When you choose to host your web analytics on-premise, you can choose the location of your servers and where the personal data is stored.

  More flexibility

  With self-hosted web analytics platforms like Matomo On-Premise, you can extend the platform to do anything you want without the restrictions that cloud hosted platforms impose.

  You can :

  • Get full access to the source code of open-source solutions, like Matomo
  • Extend the platform however you want for your business
  • Get access to APIs
  • Have no data limitations or restrictions
  • Get RAW data access
  • Have control over security

  >> Read more about on-premise flexibility for web analytics here

  

  So what does the future look like for Google Analytics and GDPR ?

  It’s difficult to assess this right now. How exactly GDPR is enforced is still quite unclear. 

  What is clear however, is now website owners in Berlin using Google Analytics are lawfully required to ask their visitors for consent to collect personal data. It has been reported that Google Analytics has already received 200,000 complaints in Germany alone and it appears this trend is likely to continue across much of the EU.

  When using Google Analytics in the EU you must also ensure your privacy policy is updated so website visitors are aware that data is being collected through Google Analytics for its own purposes.

  Moving to a web analytics on-premise platform

  Matomo Analytics is the #1 open-source web analytics platform in the world and has been rated as an exceptional alternative to Google Analytics. Check the reviews on Capterra.

  Choosing Matomo On-Premise means you can control exactly where your data is stored, you have full flexibility to customise the platform to do what you want and it’s FREE.

  Matomo’s mission is to give control back to website owners and the team has designed the platform so that moving away from Google Analytics is seamless. Matomo offers most of your favourite Google Analytics features, a leaner interface to navigate, and the option to add free and paid premium features that Google Analytics can’t even offer you.

  And now you can import your historical Google Analytics data directly into your Matomo with the Google Analytics Importer plugin.

  DOWNLOAD MATOMO (FREE)

  And if you can’t host web analytics on your own servers ...

  Hosting web analytics on-premise is not an option for all businesses as you do need the internal infrastructure and technical knowledge to host your own platform.

  If you can’t self-host, then Matomo has a Cloud hosted solution you can easily install and operate like Google Analytics, which is hosted on Matomo’s servers in the EU. 

  The GDPR advantages of choosing Matomo Cloud over Google Analytics are :

  • Servers are secure and based in the EU (strict laws forbid outside access)
  • 100% data ownership – we never use data for our own purposes
  • You can export your data anytime and switch to Matomo On-Premise whenever you like
  • User-privacy protection
  • Advanced GDPR Manager and data anonymisation features which GA doesn’t offer

  

  Interested to learn more ?

  If you are wanting to learn more about why users are making the move from Google Analytics to Matomo, check out our Matomo Analytics vs Google Analytics comparison page.

  >> Matomo Analytics vs Google Analytics

• Android recording video with overlay view [way 2]

  2 mars 2016, par t0m

  I am trying app in android which have functionality to capture video with overlay views. I tried two ways (1. and 2.).
  1. Via SurfaceView and JavaCV with FFmpeg.
  2. Via OpenCV and JavaCV with FFmpeg.
  3. For API21+ maybe with MediaProjection.

  (Question is divided to two questions, due to stackoverflow length limit.)

  ad 1. Via SurfaceView and JavaCV with FFmpeg :

  Here

  ad 2. Via OpenCV and JavaCV with FFmpeg :

  OpenCVCameraActivity.java :

  import android.app.Activity;
  
  import android.hardware.Camera;
  
  import android.media.AudioFormat;
  
  import android.media.AudioRecord;
  
  import android.media.MediaRecorder;
  
  import android.os.Bundle;
  
  import android.os.Environment;
  
  import android.util.Log;
  
  import android.view.Menu;
  
  import android.view.MenuItem;
  
  import android.view.MotionEvent;
  
  import android.view.SubMenu;
  
  import android.view.SurfaceView;
  
  import android.view.View;
  
  import android.view.WindowManager;
  
  import android.widget.Toast;
  
  
  
  import org.bytedeco.javacv.FFmpegFrameRecorder;
  
  import org.bytedeco.javacv.Frame;
  
  import org.opencv.android.BaseLoaderCallback;
  
  import org.opencv.android.CameraBridgeViewBase;
  
  import org.opencv.android.LoaderCallbackInterface;
  
  import org.opencv.android.OpenCVLoader;
  
  import org.opencv.core.Mat;
  
  
  
  import java.io.File;
  
  import java.nio.ByteBuffer;
  
  import java.nio.ShortBuffer;
  
  import java.text.SimpleDateFormat;
  
  import java.util.Date;
  
  import java.util.List;
  
  import java.util.ListIterator;
  
  
  
  @SuppressWarnings("ALL")
  
  public class OpenCVCameraActivity extends Activity implements
  
          CameraBridgeViewBase.CvCameraViewListener2,
  
          View.OnTouchListener {
  
  
  
      //name of activity, for DEBUGGING
  
      private static final String TAG = OpenCVCameraActivity.class.getSimpleName();
  
  
  
      private OpenCVCameraPreview mOpenCvCameraView;
  
      private List mResolutionList;
  
      private MenuItem[] mEffectMenuItems;
  
      private SubMenu mColorEffectsMenu;
  
      private MenuItem[] mResolutionMenuItems;
  
      private SubMenu mResolutionMenu;
  
  
  
      private static long frameCounter = 0;
  
  
  
      long startTime = 0;
  
      private Mat edgesMat;
  
      boolean recording = false;
  
      private int sampleAudioRateInHz = 44100;
  
      private int imageWidth = 1280;
  
      private int imageHeight = 720;
  
      private int frameRate = 30;
  
      private Frame yuvImage = null;
  
      private File ffmpeg_link;
  
      private FFmpegFrameRecorder recorder;
  
  
  
      /*audio data getting thread */
  
      private AudioRecord audioRecord;
  
      private AudioRecordRunnable audioRecordRunnable;
  
      private Thread audioThread;
  
      volatile boolean runAudioThread = true;
  
      ShortBuffer[] samples;
  
  
  
  
  
      private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
  
          @Override
  
          public void onManagerConnected(int status) {
  
              switch (status) {
  
                  case LoaderCallbackInterface.SUCCESS:
  
                      Log.i(TAG, "OpenCV loaded successfully");
  
                      mOpenCvCameraView.enableView();
  
                      mOpenCvCameraView.setOnTouchListener(OpenCVCameraActivity.this);
  
                  break;
  
                  default:
  
                      super.onManagerConnected(status);
  
                  break;
  
              }
  
          }
  
      };
  
  
  
      @Override
  
      protected void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          if(Static.DEBUG) Log.i(TAG, "onCreate()");
  
  
  
          getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
  
  
  
          Thread.setDefaultUncaughtExceptionHandler(uncaughtExceptionHandler);
  
  
  
          try {
  
              setContentView(R.layout.activity_opencv);
  
  
  
              mOpenCvCameraView = (OpenCVCameraPreview) findViewById(R.id.openCVCameraPreview);
  
              mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
  
              mOpenCvCameraView.setCvCameraViewListener(this);
  
  
  
              mOpenCvCameraView.enableFpsMeter();
  
  
  
              ffmpeg_link = new File(Environment.getExternalStorageDirectory(), "stream.mp4");
  
          } catch (Exception e){
  
              e.printStackTrace();
  
          }
  
      }
  
  
  
      private Thread.UncaughtExceptionHandler uncaughtExceptionHandler =
  
              new Thread.UncaughtExceptionHandler() {
  
                  public void uncaughtException(Thread thread, Throwable ex) {
  
                      if(Static.DEBUG) Log.e(TAG, "Uncaught exception", ex);
  
                  }
  
              };
  
  
  
      @Override
  
      protected void onRestart() {
  
          if (Static.DEBUG) Log.i(TAG, "onRestart()");
  
          super.onRestart();
  
      }
  
  
  
      @Override
  
      protected void onStart() {
  
          if (Static.DEBUG) Log.i(TAG, "onStart()");
  
          super.onStart();
  
      }
  
  
  
      @Override
  
      protected void onResume() {
  
          if (Static.DEBUG) Log.i(TAG, "onResume()");
  
          super.onResume();
  
  
  
          if (!OpenCVLoader.initDebug()) {
  
              Log.i(TAG, "Internal OpenCV library not found. Using OpenCV Manager for initialization");
  
              OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_1_0, this, mLoaderCallback);
  
          } else {
  
              Log.i(TAG, "OpenCV library found inside package. Using it!");
  
              mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
  
          }
  
  
  
      }
  
  
  
      @Override
  
      public boolean onCreateOptionsMenu(Menu menu) {
  
          if (Static.DEBUG) Log.i(TAG, "onCreateOptionsMenu()");
  
          super.onCreateOptionsMenu(menu);
  
  
  
          List<string> effects = mOpenCvCameraView.getEffectList();
  
  
  
          if (effects == null) {
  
              Log.e(TAG, "Color effects are not supported by device!");
  
              return true;
  
          }
  
  
  
          mColorEffectsMenu = menu.addSubMenu("Color Effect");
  
          mEffectMenuItems = new MenuItem[effects.size()];
  
  
  
          int idx = 0;
  
          ListIterator<string> effectItr = effects.listIterator();
  
          while(effectItr.hasNext()) {
  
              String element = effectItr.next();
  
              mEffectMenuItems[idx] = mColorEffectsMenu.add(1, idx, Menu.NONE, element);
  
              idx++;
  
          }
  
  
  
          mResolutionMenu = menu.addSubMenu("Resolution");
  
          mResolutionList = mOpenCvCameraView.getResolutionList();
  
          mResolutionMenuItems = new MenuItem[mResolutionList.size()];
  
  
  
          ListIterator resolutionItr = mResolutionList.listIterator();
  
          idx = 0;
  
          while(resolutionItr.hasNext()) {
  
              Camera.Size element = resolutionItr.next();
  
              mResolutionMenuItems[idx] = mResolutionMenu.add(2, idx, Menu.NONE,
  
                      Integer.valueOf(element.width).toString() + "x" + Integer.valueOf(element.height).toString());
  
              idx++;
  
          }
  
  
  
          return true;
  
      }
  
  
  
      @Override
  
      protected void onPause() {
  
          if (Static.DEBUG) Log.i(TAG, "onPause()");
  
          super.onPause();
  
  
  
          if (mOpenCvCameraView != null)
  
              mOpenCvCameraView.disableView();
  
  
  
      }
  
  
  
      @Override
  
      protected void onStop() {
  
          if (Static.DEBUG) Log.i(TAG, "onStop()");
  
          super.onStop();
  
      }
  
  
  
      @Override
  
      protected void onDestroy() {
  
          if (Static.DEBUG) Log.i(TAG, "onDestroy()");
  
          super.onDestroy();
  
  
  
          if (mOpenCvCameraView != null)
  
              mOpenCvCameraView.disableView();
  
      }
  
  
  
      public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
  
  
  
          ++frameCounter;
  
          //Log.i(TAG, "Frame number: "+frameCounter);
  
  
  
          final Mat rgba = inputFrame.rgba();
  
          //Core.flip(rgba, rgba, 1);
  
  
  
          /*if(Static.DEBUG) Log.i(TAG,"rgba.total(): "+rgba.total());
  
          if(Static.DEBUG) Log.i(TAG,"rgba.channels(): " +rgba.channels());*/
  
          byte[] data = new byte[(int) (rgba.total() * rgba.channels())];
  
          rgba.get(0, 0, data);
  
          //if(Static.DEBUG) Log.i(TAG,"return_buff: "+return_buff.length);
  
  
  
          if (audioRecord == null || audioRecord.getRecordingState() != AudioRecord.RECORDSTATE_RECORDING) {
  
              startTime = System.currentTimeMillis();
  
              return rgba;
  
          }
  
  
  
          // get video data
  
          if (yuvImage != null &amp;&amp; recording) {
  
              ByteBuffer b = (ByteBuffer)yuvImage.image[0].position(0);
  
              b.put(data);
  
  
  
              try {
  
                  long t = 1000 * (System.currentTimeMillis() - startTime);
  
                  if(Static.DEBUG) Log.i(TAG,"Writing Frame on timestamp: "+t);
  
                  if (t > recorder.getTimestamp()) {
  
                      recorder.setTimestamp(t);
  
                  }
  
                  recorder.record(yuvImage);
  
              } catch (FFmpegFrameRecorder.Exception e) {
  
                  if(Static.DEBUG) Log.i(TAG,e.getMessage());
  
                  e.printStackTrace();
  
              }
  
          }
  
  
  
          return rgba;
  
      }
  
  
  
      @Override
  
      public void onCameraViewStarted(int width, int height) {
  
          edgesMat = new Mat();
  
      }
  
  
  
      @Override
  
      public void onCameraViewStopped() {
  
          if (edgesMat != null)
  
              edgesMat.release();
  
  
  
          edgesMat = null;
  
      }
  
  
  
      public boolean onOptionsItemSelected(MenuItem item) {
  
          Log.i(TAG, "called onOptionsItemSelected; selected item: " + item);
  
          if (item.getGroupId() == 1)
  
          {
  
              mOpenCvCameraView.setEffect((String) item.getTitle());
  
              Toast.makeText(this, mOpenCvCameraView.getEffect(), Toast.LENGTH_SHORT).show();
  
          } else if (item.getGroupId() == 2) {
  
              int id = item.getItemId();
  
              Camera.Size resolution = mResolutionList.get(id);
  
              mOpenCvCameraView.setResolution(resolution);
  
              resolution = mOpenCvCameraView.getResolution();
  
              String caption = Integer.valueOf(resolution.width).toString() + "x" + Integer.valueOf(resolution.height).toString();
  
              Toast.makeText(this, caption, Toast.LENGTH_SHORT).show();
  
          }
  
  
  
          return true;
  
      }
  
  
  
      @Override
  
      public boolean onTouch(View v, MotionEvent event) {
  
          Log.i(TAG,"onTouch event");
  
          SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss");
  
          String currentDateandTime = sdf.format(new Date());
  
          String fileName = Environment.getExternalStorageDirectory().getPath() +
  
                  "/sample_picture_" + currentDateandTime + ".jpg";
  
          mOpenCvCameraView.takePicture(fileName);
  
          Toast.makeText(this, fileName + " saved", Toast.LENGTH_SHORT).show();
  
          return false;
  
      }
  
  
  
      /**
  
       * Click to ImageButton to start recording.
  
       */
  
      public void onClickBtnStartRecord2(View v) {
  
          if (Static.DEBUG) Log.i(TAG, "onClickBtnStartRecord()");
  
  
  
          if(!recording)
  
              startRecording();
  
          else
  
              stopRecording();
  
      }
  
  
  
      private void startRecording() {
  
          if (Static.DEBUG) Log.i(TAG, "startRecording()");
  
          initRecorder();
  
  
  
          try {
  
              recorder.start();
  
              startTime = System.currentTimeMillis();
  
              recording = true;
  
              audioThread.start();
  
              if (Static.DEBUG) Log.i(TAG, "startRecording() success");
  
          } catch(FFmpegFrameRecorder.Exception e) {
  
              e.printStackTrace();
  
          }
  
      }
  
  
  
      private void stopRecording() {
  
          if (Static.DEBUG) Log.i(TAG, "stopRecording()");
  
  
  
          runAudioThread = false;
  
          try {
  
              audioThread.join();
  
          } catch(InterruptedException e) {
  
              e.printStackTrace();
  
          }
  
          audioRecordRunnable = null;
  
          audioThread = null;
  
          if (Static.DEBUG) Log.i(TAG, "stopRecording() 2");
  
          if(recorder != null &amp;&amp; recording) {
  
  
  
              recording = false;
  
              try {
  
                  recorder.stop();
  
                  recorder.release();
  
                  Log.i(TAG, "Finishing recording, calling stop and release on recorder");
  
              } catch(FFmpegFrameRecorder.Exception e) {
  
                  e.printStackTrace();
  
              }
  
              recorder = null;
  
          }
  
      }
  
  
  
  
  
      //---------------------------------------
  
      // initialize ffmpeg_recorder
  
      //---------------------------------------
  
      private void initRecorder() {
  
  
  
          Log.i(TAG, "init recorder");
  
          try {
  
  
  
              if (yuvImage == null) {
  
                  yuvImage = new Frame(imageWidth, imageHeight, Frame.DEPTH_UBYTE, 4);
  
                  Log.i(TAG, "create yuvImage");
  
              }
  
  
  
              Log.i(TAG, "ffmpeg_url: " + ffmpeg_link.getAbsolutePath());
  
              //Log.i(TAG, "ffmpeg_url: " + ffmpeg_link.exists());
  
              recorder = new FFmpegFrameRecorder(ffmpeg_link, imageWidth, imageHeight, 1);
  
              recorder.setFormat("mp4");
  
              recorder.setSampleRate(sampleAudioRateInHz);
  
              // Set in the surface changed method
  
              recorder.setFrameRate(frameRate);
  
  
  
              audioRecordRunnable = new AudioRecordRunnable();
  
              audioThread = new Thread(audioRecordRunnable);
  
              runAudioThread = true;
  
              Log.i(TAG, "recorder initialize success");
  
          } catch (Exception e){
  
              e.printStackTrace();
  
          }
  
      }
  
  
  
      //---------------------------------------------
  
      // audio thread, gets and encodes audio data
  
      //---------------------------------------------
  
      class AudioRecordRunnable implements Runnable {
  
  
  
          @Override
  
          public void run() {
  
              android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
  
  
  
              // Audio
  
              int bufferSize;
  
              ShortBuffer audioData;
  
              int bufferReadResult;
  
  
  
              bufferSize = AudioRecord.getMinBufferSize(sampleAudioRateInHz,
  
                      AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);
  
              audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleAudioRateInHz,
  
                      AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize);
  
  
  
              audioData = ShortBuffer.allocate(bufferSize);
  
  
  
              Log.d(TAG, "audioRecord.startRecording()");
  
              audioRecord.startRecording();
  
  
  
              // ffmpeg_audio encoding loop
  
              while(runAudioThread) {
  
                  //Log.v(TAG,"recording? " + recording);
  
                  bufferReadResult = audioRecord.read(audioData.array(), 0, audioData.capacity());
  
                  audioData.limit(bufferReadResult);
  
                  if(bufferReadResult > 0) {
  
                      Log.v(TAG, "bufferReadResult: " + bufferReadResult);
  
                      // If "recording" isn't true when start this thread, it never get's set according to this if statement...!!!
  
                      // Why?  Good question...
  
                      if(recording) {
  
                              try {
  
                                  recorder.recordSamples(audioData);
  
                                  //Log.v(TAG,"recording " + 1024*i + " to " + 1024*i+1024);
  
                              } catch(FFmpegFrameRecorder.Exception e) {
  
                                  Log.v(TAG, e.getMessage());
  
                                  e.printStackTrace();
  
                              }
  
                      }
  
                  }
  
              }
  
              Log.v(TAG, "AudioThread Finished, release audioRecord");
  
  
  
              // encoding finish, release recorder
  
              if(audioRecord != null) {
  
                  audioRecord.stop();
  
                  audioRecord.release();
  
                  audioRecord = null;
  
                  Log.v(TAG, "audioRecord released");
  
              }
  
          }
  
      }
  
  }
  
  </string></string>

  OpenCVCameraPreview.java :

  import android.content.Context;
  
  import android.hardware.Camera;
  
  import android.util.AttributeSet;
  
  import android.util.Log;
  
  
  
  import org.opencv.android.JavaCameraView;
  
  
  
  import java.io.FileOutputStream;
  
  import java.util.List;
  
  
  
  public class OpenCVCameraPreview extends JavaCameraView implements Camera.PictureCallback {
  
  
  
      private static final String TAG =  OpenCVCameraPreview.class.getSimpleName();
  
      private String mPictureFileName;
  
  
  
      public OpenCVCameraPreview(Context context, AttributeSet attrs) {
  
          super(context, attrs);
  
      }
  
  
  
      public List<string> getEffectList() {
  
          return mCamera.getParameters().getSupportedColorEffects();
  
      }
  
  
  
      public boolean isEffectSupported() {
  
          return (mCamera.getParameters().getColorEffect() != null);
  
      }
  
  
  
      public String getEffect() {
  
          return mCamera.getParameters().getColorEffect();
  
      }
  
  
  
      public void setEffect(String effect) {
  
          Camera.Parameters params = mCamera.getParameters();
  
          params.setColorEffect(effect);
  
          mCamera.setParameters(params);
  
      }
  
  
  
      public List getResolutionList() {
  
          return mCamera.getParameters().getSupportedPreviewSizes();
  
      }
  
  
  
      public void setResolution(Camera.Size resolution) {
  
          disconnectCamera();
  
          mMaxHeight = resolution.height;
  
          mMaxWidth = resolution.width;
  
          connectCamera(getWidth(), getHeight());
  
      }
  
  
  
      public Camera.Size getResolution() {
  
          return mCamera.getParameters().getPreviewSize();
  
      }
  
  
  
      public void takePicture(final String fileName) {
  
          Log.i(TAG, "Taking picture");
  
          this.mPictureFileName = fileName;
  
          // Postview and jpeg are sent in the same buffers if the queue is not empty when performing a capture.
  
          // Clear up buffers to avoid mCamera.takePicture to be stuck because of a memory issue
  
          mCamera.setPreviewCallback(null);
  
  
  
          // PictureCallback is implemented by the current class
  
          mCamera.takePicture(null, null, this);
  
      }
  
  
  
      @Override
  
      public void onPictureTaken(byte[] data, Camera camera) {
  
          Log.i(TAG, "Saving a bitmap to file");
  
          // The camera preview was automatically stopped. Start it again.
  
          mCamera.startPreview();
  
          mCamera.setPreviewCallback(this);
  
  
  
          // Write the image in a file (in jpeg format)
  
          try {
  
              FileOutputStream fos = new FileOutputStream(mPictureFileName);
  
  
  
              fos.write(data);
  
              fos.close();
  
  
  
          } catch (java.io.IOException e) {
  
              Log.e("PictureDemo", "Exception in photoCallback", e);
  
          }
  
  
  
      }
  
  }
  
  </string>

  activity_opencv.xml :

  <?xml version="1.0" encoding="utf-8"?>
  
  <relativelayout>
  
  
  
      
  
  
  
      &lt;ImageButton<br />
  
          android:id=&quot;@+id/btnStartRecord2&quot;<br />
  
          android:layout_width=&quot;70dp&quot;<br />
  
          android:layout_height=&quot;70dp&quot;<br />
  
          android:scaleType=&quot;fitXY&quot;<br />
  
          android:src=&quot;@drawable/record_icon&quot;<br />
  
          android:background=&quot;@null&quot;<br />
  
          android:text=&quot;@string/btnStartRecord&quot;<br />
  
          android:onClick=&quot;onClickBtnStartRecord2&quot;<br />
  
          android:layout_centerVertical=&quot;true&quot;<br />
  
          android:layout_alignParentRight=&quot;true&quot;<br />
  
          android:layout_alignParentEnd=&quot;true&quot;/&gt;
  
  
  
  
  
  </relativelayout>

  Overlay views working, but recorded video is without overlay views, and recording with onCameraFrame method is very slow.

• FFmpeg saturates memory + CPU usage drops to 0% during very basic conversion of PNG files to MP4 video

  7 août 2022, par mattze_frisch

  I have this Python function that runs ffmpeg with minimal options from the Windows command line :

  


  def run_ffmpeg(frames_path, ffmpeg_path=notebook_directory):
    '''
    This function runs ffmpeg.exe to convert PNG image files into a MP4 video.
    
    Parameters
    ----------
    frames_path : string
        Absolute path to the PNG files
    ffmpeg_path : string
        Absolute path to the FFmpeg executable (ffmpeg.exe)
    '''
    
    from subprocess import check_call
    
    
    check_call(
        [
            os.path.join(ffmpeg_path, 'ffmpeg'),
            '-y',    # Overwrite output files without asking
            '-report',    # Write logfile to current working directory
            '-framerate', '60',    # Input frame rate
            '-i', os.path.join(frames_path, 'frame%05d.png'),    # Path to input frames
            os.path.join(frames_path, 'video.mp4')    # Path to store output video
        ]
    )


  


  When running it from a Jupyter notebook over 2500 PNG files (RGBA, ca. 600-700 kB each, 9000 x 13934 pixels), CPU usage briefly peaks to 100% before dropping to 0%, while memory usage quickly saturates to 100% and stays there, slowing the system down almost to a freeze, so I need to terminate ffmpeg from the task manager :

  


  Screenshot

  


  The generated video file has a size of only 48 bytes and contains just a black frame when viewed in the VLC player.

  


  This is the ffmpeg log output :

  


  ffmpeg started on 2022-08-05 at 17:17:55
Report written to "ffmpeg-20220805-171755.log"
Log level: 48
Command line:
"C:\\Users\\Username\\Desktop\\folder\\ffmpeg" -y -report -framerate 60 -i "C:\\Users\\Username\\Desktop\\e\\frame%05d.png" "C:\\Users\\Username\\Desktop\\e\\video.mp4"
ffmpeg version 2022-07-14-git-882aac99d2-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12.1.0 (Rev2, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libshaderc --enable-vulkan --enable-libplacebo --ena  libavutil      57. 29.100 / 57. 29.100
  libavcodec     59. 38.100 / 59. 38.100
  libavformat    59. 28.100 / 59. 28.100
  libavdevice    59.  8.100 / 59.  8.100
  libavfilter     8. 45.100 /  8. 45.100
  libswscale      6.  8.100 /  6.  8.100
  libswresample   4.  8.100 /  4.  8.100
  libpostproc    56.  7.100 / 56.  7.100
Splitting the commandline.
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Reading option '-framerate' ... matched as AVOption 'framerate' with argument '60'.
Reading option '-i' ... matched as input url with argument 'C:\Users\Username\Desktop\e\frame%05d.png'.
Reading option 'C:\Users\Username\Desktop\e\video.mp4' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option y (overwrite output files) with argument 1.
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input url C:\Users\Username\Desktop\e\frame%05d.png.
Successfully parsed a group of options.
Opening an input file: C:\Users\Username\Desktop\e\frame%05d.png.
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00000.png' for reading
[file @ 0000000000425680] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000042d800] Statistics: 668318 bytes read, 0 seeks
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00001.png' for reading
[file @ 000000000042dac0] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000042d6c0] Statistics: 668371 bytes read, 0 seeks
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00002.png' for reading
[file @ 000000000042d6c0] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000042dac0] Statistics: 669177 bytes read, 0 seeks
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00003.png' for reading
[file @ 000000000042dac0] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 0000000000437a40] Statistics: 684594 bytes read, 0 seeks
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00004.png' for reading
[file @ 0000000000437a40] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 0000000000437c00] Statistics: 703014 bytes read, 0 seeks
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00005.png' for reading
[file @ 0000000000437c00] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 0000000000437d00] Statistics: 721604 bytes read, 0 seeks
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00006.png' for reading
[file @ 0000000000437cc0] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 0000000000437f40] Statistics: 739761 bytes read, 0 seeks
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00007.png' for reading
[file @ 0000000000437f40] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 0000000000438040] Statistics: 757327 bytes read, 0 seeks
[image2 @ 000000000041ff80] Probe buffer size limit of 5000000 bytes reached
Input #0, image2, from 'C:\Users\Username\Desktop\e\frame%05d.png':
  Duration: 00:00:41.67, start: 0.000000, bitrate: N/A
  Stream #0:0, 8, 1/60: Video: png, rgba(pc), 9000x13934 [SAR 29528:29528 DAR 4500:6967], 60 fps, 60 tbr, 60 tbn
Successfully opened the file.
Parsing a group of options: output url C:\Users\Username\Desktop\e\video.mp4.
Successfully parsed a group of options.
Opening an output file: C:\Users\Username\Desktop\e\video.mp4.
[file @ 000000002081e3c0] Setting default whitelist 'file,crypto,data'
Successfully opened the file.
detected 12 logical cores
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
Press [q] to stop, [?] for help
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00008.png' for reading
[file @ 00000000024ad980] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 00000000004379c0] Statistics: 767857 bytes read, 0 seeks
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00009.png' for reading
[file @ 000000000042d600] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 00000000004379c0] Statistics: 774848 bytes read, 0 seeks
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00010.png' for reading
[file @ 00000000004379c0] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000042da00] Statistics: 787178 bytes read, 0 seeks
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00011.png' for reading
[file @ 00000000004379c0] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000042da00] Statistics: 797084 bytes read, 0 seeks
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00012.png' for reading
[file @ 0000000000437a80] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000042da00] Statistics: 802870 bytes read, 0 seeks
[graph 0 input from stream 0:0 @ 00000000208bf800] Setting 'video_size' to value '9000x13934'
[graph 0 input from stream 0:0 @ 00000000208bf800] Setting 'pix_fmt' to value '26'
[graph 0 input from stream 0:0 @ 00000000208bf800] Setting 'time_base' to value '1/60'
[graph 0 input from stream 0:0 @ 00000000208bf800] Setting 'pixel_aspect' to value '29528/29528'
[graph 0 input from stream 0:0 @ 00000000208bf800] Setting 'frame_rate' to value '60/1'
[graph 0 input from stream 0:0 @ 00000000208bf800] w:9000 h:13934 pixfmt:rgba tb:1/60 fr:60/1 sar:29528/29528
[format @ 00000000025ef840] Setting 'pix_fmts' to value 'yuv420p|yuvj420p|yuv422p|yuvj422p|yuv444p|yuvj444p|nv12|nv16|nv21|yuv420p10le|yuv422p10le|yuv444p10le|nv20le|gray|gray10le'
[auto_scale_0 @ 00000000025efe40] w:iw h:ih flags:'' interl:0
[format @ 00000000025ef840] auto-inserting filter 'auto_scale_0' between the filter 'Parsed_null_0' and the filter 'format'
[AVFilterGraph @ 000000000042da00] query_formats: 4 queried, 3 merged, 1 already done, 0 delayed
[auto_scale_0 @ 00000000025efe40] picking yuv444p out of 13 ref:rgba alpha:1
[auto_scale_0 @ 00000000025efe40] w:9000 h:13934 fmt:rgba sar:29528/29528 -> w:9000 h:13934 fmt:yuv444p sar:1/1 flags:0x0
[auto_scale_0 @ 00000000025efe40] w:9000 h:13934 fmt:rgba sar:29528/29528 -> w:9000 h:13934 fmt:yuv444p sar:1/1 flags:0x0
[auto_scale_0 @ 00000000025efe40] w:9000 h:13934 fmt:rgba sar:29528/29528 -> w:9000 h:13934 fmt:yuv444p sar:1/1 flags:0x0
[auto_scale_0 @ 00000000025efe40] w:9000 h:13934 fmt:rgba sar:29528/29528 -> w:9000 h:13934 fmt:yuv444p sar:1/1 flags:0x0
[libx264 @ 000000002081d280] using mv_range_thread = 376
[libx264 @ 000000002081d280] using SAR=1/1
[libx264 @ 000000002081d280] frame MB size (563x871) > level limit (139264)
[libx264 @ 000000002081d280] DPB size (4 frames, 1961492 mbs) > level limit (1 frames, 696320 mbs)
[libx264 @ 000000002081d280] MB rate (29422380) > level limit (16711680)
[libx264 @ 000000002081d280] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 000000002081d280] profile High 4:4:4 Predictive, level 6.2, 4:4:4, 8-bit
[libx264 @ 000000002081d280] 264 - core 164 r3095 baee400 - H.264/MPEG-4 AVC codec - Copyleft 2003-2022 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=18 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'C:\Users\Username\Desktop\e\video.mp4':
  Metadata:
    encoder         : Lavf59.28.100
  Stream #0:0, 0, 1/15360: Video: h264 (avc1 / 0x31637661), yuv444p(tv, progressive), 9000x13934 [SAR 1:1 DAR 4500:6967], q=2-31, 60 fps, 15360 tbn
    Metadata:
      encoder         : Lavc59.38.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
Clipping frame in rate conversion by 0.000008
frame=    1 fps=0.8 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00013.png' for reading
[file @ 000000000a6a2180] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000b38de80] Statistics: 810395 bytes read, 0 seeks
frame=    2 fps=0.8 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00014.png' for reading
[file @ 000000001ec86c80] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000b38de80] Statistics: 818213 bytes read, 0 seeks
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00015.png' for reading
[file @ 000000001ec86c80] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000b38de80] Statistics: 817936 bytes read, 0 seeks
frame=    4 fps=1.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00016.png' for reading
[file @ 000000001ec86c80] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000b38de80] Statistics: 817014 bytes read, 0 seeks
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00017.png' for reading
[file @ 000000001ec86c80] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000b38de80] Statistics: 828088 bytes read, 0 seeks
frame=    6 fps=1.5 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00018.png' for reading
[file @ 000000001ec86c80] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000b38de80] Statistics: 831007 bytes read, 0 seeks
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00019.png' for reading
[file @ 000000001ec86c80] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000b38de80] Statistics: 845203 bytes read, 0 seeks
frame=    8 fps=1.7 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00020.png' for reading
[file @ 000000001ec86c80] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000b38de80] Statistics: 851548 bytes read, 0 seeks
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00021.png' for reading
[file @ 000000001ec86c80] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000b38de80] Statistics: 847629 bytes read, 0 seeks
frame=   10 fps=1.8 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00022.png' for reading
[file @ 000000001ec86c80] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000b38de80] Statistics: 860169 bytes read, 0 seeks
frame=   11 fps=1.4 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00023.png' for reading
[file @ 000000001ec86c80] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000b38de80] Statistics: 857243 bytes read, 0 seeks
frame=   12 fps=1.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[image2 @ 000000000041ff80] Opening 'C:\Users\Username\Desktop\e\frame00024.png' for reading
[file @ 000000001ec86c80] Setting default whitelist 'file,crypto,data'
[AVIOContext @ 000000000b38de80] Statistics: 835155 bytes read, 0 seeks


  


  What is the problem ?

  


  By the way, the color model of the image files was confirmed by doing

  


  from PIL import Image


img = Image.open('C:\\Users\\EPI-SMLM\\Desktop\\e\\frame00000.png')
img.mode
-------------------------------------------------------------------
C:\Program Files\Python38\lib\site-packages\PIL\Image.py:3035: DecompressionBombWarning: Image size (125406000 pixels) exceeds limit of 89478485 pixels, could be decompression bomb DOS attack.
  warnings.warn(

'RGBA'


  


  The "decompression bomb warning" appears to be a false alarm/bug.

  


  UPDATE : I can confirm that this happens even when there are only 50 image files, i.e. 50 x 700 kB = 35 MB in total size. ffmpeg still gobbles up all available memory (almost 60 GB of private bytes !!!).

  


  And it also happens if ffmpeg is run from the command line.

  


  This must be a bug !