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• Decode Frame into a byte array to IplImage

  20 février 2015, par Ernesto Luis

  I have a .drv file with 4 channels of videos. I already remove the owner headers of each frame and I get a byte array that contains the frame bytes in Mpeg4 without any header. So what I need is decode this frame (byte array) using javaCv / ffmpeg to obtain a IplImage or .jpeg image.
  Here you have some code for ideas.

  public static void main(String[] args) throws IOException

      byte [] dvr1= new byte[8*1024];
  
      byte [] dvr;      
  
      try {   
  
  
  
         System.out.println("Leyendo...");    
  
         FileInputStream fileInput= new FileInputStream("D:\\muestra.drv");
  
         ByteArrayOutputStream baos= new ByteArrayOutputStream(); 
  
  
  
         if(fileInput!=null){
  
               BufferedInputStream bufferedInput = new BufferedInputStream(fileInput);
  
  
  
         // Streams y buffers de escritura.
  
  
  
  
  
          //Leer el fichero completo y ponerlo en memoria
  
                  int leidos = 0;
  
                   while((leidos= bufferedInput.read(dvr1))>=0){
  
                      baos.write(dvr1, 0, leidos);
  
                   } 
  
                   //Pasar el contenido del fichero almacenado en memoria al arreglo de Bytes                         
  
                        dvr= baos.toByteArray();
  
                        baos.reset();
  
                        baos.close();
  
                        int lon= dvr.length;  
  
  
  
  
  
                    //Buscar el comienzo del header
  
                        int offset=0;
  
                        while(offset=dvr.length)
  
                                break;
  
                        } 
  
  
  
                        byte[] head= Arrays.copyOfRange(dvr, offset, offset+32);
  
                        offset+=32;
  
                            BasicHeader bHeader= new BasicHeader(head); 
  
                            ExtraHeader xHeader= new ExtraHeader(head);
  
                            offset+=xHeader.SuperExtraSize;
  
                            PESHeader pesHeader= new PESHeader(Arrays.copyOfRange(dvr, offset,offset+32));
  
                            offset+=32;
  
                            byte[]frame;   
  
  
  
                            if(offset+bHeader.Size/ Here is the problem
  
                                    DecodeFrame(frame);                             
  
  
  
                        }                
  
  
  
       //  System.out.println("No se encontro el archivo");
  
      } catch (java.lang.Exception e) {
  
          // TODO: handle exception
  
           System.out.println(e.getMessage());
  
      }

• Anomalie #3389 : SVP (?) télécharge les zip 2 fois

  17 février 2015, par marcimat ☺☮☯♫

  Les logs me disent qu’ils appellent 2 fois lance-requête. J’ai mis un spip_log de tous les paramètres de lance_requête. On voit bien le HEAD, puis le GET.

  ...
  Feb 17 10:40:25 127.0.0.1 (pid 7274) plugins-dist/svp/inc/svp_actionner.php:L137:log()::Pri:info : Faire do_geton avec Porte Plume Equation
  Feb 17 10:40:25 127.0.0.1 (pid 7274) plugins-dist/svp/inc/svp_actionner.php:L137:log()::Pri:info : Recuperer l’archive : porteplume_equation.zip
  Feb 17 10:40:25 127.0.0.1 (pid 7274) plugins-dist/svp/action/teleporter.php:L29:action_teleporter_composant_dist()::Pri:info : http,http://files.spip.org/spip-zone/porteplume_equation.zip,../plugins/auto/pp_latex/v0.3.3
  Feb 17 10:40:25 127.0.0.1 (pid 7274) ecrire/inc/flock.php:L524:sous_repertoire()::Pri:info : creation ../plugins/auto/pp_latex/
  Feb 17 10:40:25 127.0.0.1 (pid 7274) ecrire/inc/distant.php:L1074:lance_requete()::Pri:info : HEAD, http, , files.spip.org, /spip-zone/porteplume_equation.zip, 80, , , , , HTTP/1.0, 
  
  Feb 17 10:40:25 127.0.0.1 (pid 7274) ecrire/inc/distant.php:L1128:lance_requete()::Pri:info : Recuperer /spip-zone/porteplume_equation.zip sur files.spip.org:80 par Resource id #24
  Feb 17 10:40:25 127.0.0.1 (pid 7274) ecrire/inc/distant.php:L1074:lance_requete()::Pri:info : GET, http, , files.spip.org, /spip-zone/porteplume_equation.zip, 80, , 1, , , HTTP/1.0, 
  
  Feb 17 10:40:25 127.0.0.1 (pid 7274) ecrire/inc/distant.php:L1128:lance_requete()::Pri:info : Recuperer /spip-zone/porteplume_equation.zip sur files.spip.org:80 par Resource id #28
  Feb 17 10:40:26 127.0.0.1 (pid 7274) ecrire/inc/distant.php:L94:copie_locale()::Pri:info : copie_locale : recuperation http://files.spip.org/spip-zone/porteplume_equation.zip sur ../tmp/cache/chargeur/v0.3.3-f76fd71c-porteplume_equation.zip taille 203163 OK
  
  Feb 17 10:40:26 127.0.0.1 (pid 7274) plugins-dist/svp/teleporter/http_deballe_zip.php:L130:teleporter_http_charger_zip()::Pri:info : charger_decompresser OK pour paquet : ../tmp/cache/chargeur/v0.3.3-f76fd71c-porteplume_equation.zip
  
  Feb 17 10:40:26 127.0.0.1 (pid 7274) plugins-dist/svp/inc/svp_actionner.php:L137:log()::Pri:info : Demande d’activation de : auto/pp_latex/v0.3.3
  
  ...
  

• Problems accessing codecs with ggplot and gganimate

  19 décembre 2016, par noLongerRandom

  Using gganimate. Can’t figure out how to properly access functionality of ffmpeg, specifically I want to change the codec I’m using in the video file I’m outputting.

  # load packages
  
  library(ggplot)
  
  library(animation)
  
  library(gganimate)
  
  
  
  # Here's my data.frame
  
  myDf <- data.frame(
  
      year = c(1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014), 
  
      bottom50 = c(0.195, 0.191, 0.187, 0.192, 0.196, 0.205, 0.207, 0.210, 0.209, 0.204, 0.203, 0.204, 0.205, 0.203, 0.202, 0.200, 0.200, 0.201, 0.199, 0.195, 0.190, 0.183, 0.179, 0.179, 0.177, 0.172, 0.169, 0.169, 0.168, 0.166, 0.158, 0.159, 0.158, 0.154, 0.151, 0.148, 0.149, 0.148, 0.146, 0.149, 0.148, 0.145, 0.142, 0.138, 0.135, 0.137, 0.137, 0.136, 0.130, 0.127, 0.123, 0.127, 0.125), top1 = c(0.126, 0.127, 0.129, 0.128, 0.126, 0.123, 0.122, 0.115, 0.110, 0.111, 0.111, 0.109, 0.106, 0.105, 0.105, 0.107, 0.108, 0.111, 0.107, 0.110, 0.112, 0.115, 0.125, 0.125, 0.122, 0.133, 0.149, 0.145, 0.145, 0.139, 0.150, 0.146, 0.147, 0.153, 0.160, 0.166, 0.169, 0.177, 0.183, 0.173, 0.171, 0.172, 0.183, 0.194, 0.201, 0.199, 0.195, 0.185, 0.198, 0.196, 0.208, 0.196, 0.202)
  
  )
  
  
  
  #Basic plot
  
  p <- ggplot(myDf, aes(x = year, y = bottom50, frame = year)) + 
  
      geom_line(color = "dodgerblue") + 
  
      geom_line(aes(y = top1), color = "darkred")

  The non-animated version gets me what I want :

  

  And I get an animation version output to video with :

  gganimate(p, interval = .1, title_frame = FALSE, "income.mp4")

  That’s fine, but I want to change some the output parameters, specifically : alter the dimensions, the frame rate, and use a different codec.

  # change some of the options
  
  ani.options(ani.height = 1080, ani.width = 1920, 
  
              interval = 0.04166667, other.opts = "-vcodec qtrle -f mov")
  
  # re-animate
  
  gganimate(p, title_frame = FALSE, "income.mov")

  That gives me the following error :

  Error in animation_saver(saver, filename) : 
  
    Don't know how to save animation of type mov

  I’m using ’.mov’ as my file extension because I’m trying to change to the Animation codec (so it’s no longer a .mp4 wrapper). I’ve got ffmpeg installed, so this is probably a syntax issue. But the documentation isn’t very clear here ; gganimate doesn’t have any documentation on changing codecs (or outputting any video besides an mp4), and the animation package is light on specifics as well.