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• I want help in making video collage, tried everything but unsuccessful

  16 mars 2016, par Haider Ali

  I want to make Video Collage in which 2 or more videos should be displayed in one frame and then they can be converted into one Video file.
  I tried examples but they just add videos at the end of each video to make a long one combine video.
  Any Help Please

  String FILE_PATH = "/storage/sdcard0/testing.mp4";
  
  String FILE_PATH2 = "/storage/sdcard0/testing1.mp4";
  
  String FILE_PATH3 = "/storage/sdcard0/testing2.mp4";
  
  File file1 = new File(FILE_PATH);
  
  File file2 = new File(FILE_PATH2);
  
  File file3 = new File(FILE_PATH3);
  
  
  
  private ProgressDialog pDialog;
  
  ImageView img,img2,img3;
  
  MediaMetadataRetriever retriever2 = new MediaMetadataRetriever();
  
  MediaMetadataRetriever retriever3 = new MediaMetadataRetriever();
  
  ArrayList<bitmap> bitmapArray1 = new ArrayList<bitmap>();
  
  ArrayList<bitmap> bitmapArray2 = new ArrayList<bitmap>();
  
  ArrayList<bitmap> bitmapArray3 = new ArrayList<bitmap>();
  
  File ScreenDIR = new File("/sdcard/Screens/");
  
  </bitmap></bitmap></bitmap></bitmap></bitmap></bitmap>

  // have the object build the directory structure, if needed.

  double id1=0,id2=0,id3=0;
  
  
  
  
  
  
  
  @Override
  
  protected void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.activity_main);
  
      ScreenDIR.mkdirs();
  
  
  
       img = (ImageView)findViewById(R.id.imageView);
  
      img2 = (ImageView)findViewById(R.id.imageView2);
  
      img3 = (ImageView)findViewById(R.id.imageView3);
  
  
  
      new LoadAllProducts().execute();
  
  
  
  
  
  
  
  
  
  }
  
  
  
  class LoadAllProducts extends AsyncTask {
  
  
  
      /**
  
       * Before starting background thread Show Progress Dialog
  
       * */
  
      @Override
  
      protected void onPreExecute() {
  
          super.onPreExecute();
  
          pDialog = new ProgressDialog(MainActivity.this);
  
          pDialog.setMessage("Extracting Frames. Please wait...");
  
          pDialog.setIndeterminate(false);
  
          pDialog.setCancelable(false);
  
          pDialog.show();
  
      }
  
  
  
      /**
  
       * getting All products from url
  
       * */
  
      protected String doInBackground(String... args) {
  
          if(file1.exists()){
  
  
  
  
  
              for (long i = 0; i < 5000; i += 1000/14) { // lenms - video length in milliseconds
  
  
  
                  MediaMetadataRetriever retriever = new MediaMetadataRetriever();
  
                  retriever.setDataSource(file1.toString());
  
  
  
                 // Bitmap bitmap = retriever.getFrameAtTime((i*1000/14), MediaMetadataRetriever.OPTION_CLOSEST_SYNC);
  
  
  
                  saveBitmapToCahche( getResizedBitmap((retriever.getFrameAtTime((i*1000/14), MediaMetadataRetriever.OPTION_CLOSEST_SYNC)), 500) ,String.valueOf(id1));
  
                  id1++;
  
                  //bitmapArray1.add(bitmap);
  
  
  
                 /* File file = new File(ScreenDIR, "sketchpad1" + id1 + ".png");
  
                  FileOutputStream fOut = null;
  
                  try {
  
                      fOut = new FileOutputStream(file);
  
                  } catch (FileNotFoundException e) {
  
                      e.printStackTrace();
  
                  }
  
  
  
                  //bitmap.compress(Bitmap.CompressFormat.PNG, 30, fOut);
  
  
  
                  try {
  
                      fOut.flush();
  
                  } catch (IOException e) {
  
                      e.printStackTrace();
  
                  }
  
                  try {
  
                      fOut.close();
  
  
  
  
  
                  } catch (IOException e) {
  
                      e.printStackTrace();
  
                  }*/
  
              }
  
  
  
              }
  
         /* if(file2.exists()){
  
              retriever2.setDataSource(file2.toString());
  
              for (long i = 0; i < 3000; i += 1000/24) { // lenms - video length in milliseconds
  
                  bitmap2 = retriever2.getFrameAtTime(i*1000/29, MediaMetadataRetriever.OPTION_CLOSEST_SYNC);
  
                  //bitmapArray2.add(bitmap2);
  
  
  
                  File file = new File(ScreenDIR, "sketchpad2" + id2 + ".png");
  
                  FileOutputStream fOut = null;
  
                  try {
  
                      fOut = new FileOutputStream(file);
  
                  } catch (FileNotFoundException e) {
  
                      e.printStackTrace();
  
                  }
  
  
  
                  bitmap2.compress(Bitmap.CompressFormat.PNG, 85, fOut);
  
                  try {
  
                      fOut.flush();
  
                  } catch (IOException e) {
  
                      e.printStackTrace();
  
                  }
  
                  try {
  
                      fOut.close();
  
                      id2++;
  
                  } catch (IOException e) {
  
                      e.printStackTrace();
  
                  }
  
              }
  
  
  
  
  
  
  
          }
  
          if(file3.exists()){
  
              retriever3.setDataSource(file3.toString());
  
              for (long i = 0; i < 3000; i += 1000/24) { // lenms - video length in milliseconds
  
                  bitmap3 = retriever3.getFrameAtTime(i*1000/29, MediaMetadataRetriever.OPTION_CLOSEST_SYNC);
  
                 // bitmapArray3.add(bitmap3);
  
  
  
                  File file = new File(ScreenDIR, "sketchpad3" + id3 + ".png");
  
                  FileOutputStream fOut = null;
  
                  try {
  
                      fOut = new FileOutputStream(file);
  
                  } catch (FileNotFoundException e) {
  
                      e.printStackTrace();
  
                  }
  
  
  
                  bitmap3.compress(Bitmap.CompressFormat.PNG, 85, fOut);
  
                  try {
  
                      fOut.flush();
  
                  } catch (IOException e) {
  
                      e.printStackTrace();
  
                  }
  
                  try {
  
                      fOut.close();
  
                      id3++;
  
                  } catch (IOException e) {
  
                      e.printStackTrace();
  
                  }
  
              }
  
  
  
              }*/
  
  
  
  
  
  
  
  
  
          return null;
  
      }
  
      /**
  
       * After completing background task Dismiss the progress dialog
  
       * **/
  
      protected void onPostExecute(String file_url) {
  
          // dismiss the dialog after getting all products
  
          pDialog.dismiss();
  
  
  
  
  
  
  
          img.setImageBitmap(retrieveBitmapFromCache(String.valueOf(id2)));
  
          id2 = 50;
  
  
  
          img2.setImageBitmap(retrieveBitmapFromCache(String.valueOf(id2)));
  
          id2 = 69;
  
  
  
          img3.setImageBitmap(retrieveBitmapFromCache(String.valueOf(id2)));
  
  
  
  
  
         // img2.setImageBitmap(bitmapArray2.get(0));
  
         // img3.setImageBitmap(bitmapArray3.get(0));
  
  
  
          }
  
  
  
  
  
  
  
  
  
      }
  
  
  
  
  
  public void saveBitmapToCahche(Bitmap bb,String ID ){
  
  
  
      Cache.getInstance().getLru().put(ID, bb);
  
  
  
  
  
  }
  
  public Bitmap retrieveBitmapFromCache(String ID) {
  
  
  
  
  
      Bitmap bitmap = (Bitmap) Cache.getInstance().getLru().get(ID);
  
  
  
      return  bitmap;
  
  
  
  }
  
  public Bitmap getResizedBitmap(Bitmap image, int maxSize) {
  
      int width = image.getWidth();
  
      int height = image.getHeight();
  
  
  
      float bitmapRatio = (float)width / (float) height;
  
      if (bitmapRatio > 0) {
  
          width = maxSize;
  
          height = (int) (width / bitmapRatio);
  
      } else {
  
          height = maxSize;
  
          width = (int) (height * bitmapRatio);
  
      }
  
      return Bitmap.createScaledBitmap(image, width, height, true);
  
  }
  
  }

  `

• Anomalie #4725 : SyntaxError : JSon.parse : unexpected character at line 1 column 1 of the JSON data

  12 avril 2021, par Franck D

  https://www.spip.net/fr_article4453.html

  define(’_NO_CACHE’, -1) ;
  define(’_INTERDIRE_COMPACTE_HEAD_ECRIRE’, true) ;
  error_reporting(E_ALL^E_NOTICE) ;
  ini_set ("display_errors", "On") ;
  define(’SPIP_ERREUR_REPORT’,E_ALL) ;
  $GLOBALS[’taille_des_logs’] = 500 ;
  define(’_MAX_LOG’, 500000) ;
  define(’_LOG_FILELINE’,true) ;
  define(’_LOG_FILTRE_GRAVITE’,8) ;
  define(’_DEBUG_SLOW_QUERIES’, true) ;
  define(’_BOUCLE_PROFILER’, 5000) ;

  Je vais essayer de refaire, mais c’est pas simple, marcimat à eu le cas une fois et n’a pas réussi à reproduire

• avformat/rtpdec_jpeg : fix low contrast image on low quality setting

  24 mars 2016, par Ico Doornekamp

  avformat/rtpdec_jpeg : fix low contrast image on low quality setting
  Original mail and my own followup on ffmpeg-user earlier today :
  I have a device sending out a MJPEG/RTP stream on a low quality setting.
  
  Decoding and displaying the video with libavformat results in a washed
  
  out, low contrast, greyish image. Playing the same stream with VLC results
  
  in proper color representation.
  Screenshots for comparison :
    http://zevv.nl/div/libav/shot-ffplay.jpg
  
    http://zevv.nl/div/libav/shot-vlc.jpg
  A pcap capture of a few seconds of video and SDP file for playing the
  
  stream are available at
    http://zevv.nl/div/libav/mjpeg.pcap
  
    http://zevv.nl/div/libav/mjpeg.sdp
  I believe the problem might be in the calculation of the quantization
  
  tables in the function create_default_qtables(), the attached patch
  
  solves the issue for me.
  The problem is that the argument ’q’ is of the type uint8_t. According to the
  
  JPEG standard, if 1 <= q <= 50, the scale factor ’S’ should be 5000 / Q.
  
  Because the create_default_qtables() reuses the variable ’q’ to store the
  
  result of this calculation, for small values of q < 19, q wil subsequently
  
  overflow and give wrong results in the calculated quantization tables. The
  
  patch below uses a new variable ’S’ (same name as in RFC2435) with the proper
  
  range to store the result of the division.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/rtpdec_jpeg.c