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• Join us for the Piwik Community Meetup 2015 !

  25 juin 2015, par Piwik Core Team — Community, Meta

  

  We’re excited to announce that our third Piwik Community Meetup will be held in Berlin on Tuesday, the 4th of August, 2015. Don’t miss this great opportunity to connect with other users and meet the core team behind Piwik. It’s free, so REGISTER TODAY ! And maybe you would like to share your Piwik use case ? We’re also waiting for your presentation ideas.

  We will cover some of the upcoming features, discuss the future of Piwik, share tricks and hacks to help you get the most out of your Piwik platform, and socialise. If you use Piwik to improve your websites and apps, or are just generally curious about digital analytics and marketing – this event is not to be missed. As our core team is scattered all over the world, this will be a rare opportunity for you to meet and talk to us all at once – especially for those of you interested in the platform, integrating your app with Piwik, and building plugins.

  After the official part, we would like to enjoy drinks with all the participants in the nearby bars. We hope you will be able to join us !

  All Piwik community members are warmly invited to take part in the meetup !

  Piwik Community Meetup 2015

  When ?

  Tuesday, the 4th of August, from 5-9pm

  Where ?

  Kulturbrauerei
  Schönhauser Allee
  Prenzlauer Berg area
  Berlin, Germany
  exact directions tbc.

  Languages :

  English and German

  Book tickets :

  BOOK YOUR FREE INVITATION HERE

  Open call for YOUR presentation ideas

  We would also like to hear how you use Piwik – we’ll be delighted if you’d share your interesting use case during the Meetup. Please send your presentation ideas (speaking time : 5 to 7 minutes) to : meetup@piwik.pro ! Deadline : 20th of July 2015.

  Contact the organisers :

  meetup@piwik.pro

• javacv FFMPEG decode memory leak ?

  25 mars 2015, par Liquan Nie

  I’m new to JAVACV and I am using FFMPEG to play some video file as follows
  My enviroument is windows 8 with jdk7 and javacv0.10.

              String file_path ="D:\\1.mp4";
  
                  
  
                  // regist all format and codec
  
                  avformat.av_register_all();
  
                  avcodec.avcodec_register_all();
  
                  
  
                  // open file
  
                  avformat.AVFormatContext avFormatCtx = avformat.avformat_alloc_context();
  
                  if (avformat.avformat_open_input(avFormatCtx, file_path, null, null) != 0)
  
                  {
  
                          System.out.println("cann't open file\r\n");
  
                          return;
  
                  }
  
                  // find stream info
  
                  if (avformat.avformat_find_stream_info(avFormatCtx, (AVDictionary)null) < 0)
  
                  {
  
                          System.out.println("can't find stream info\r\n");
  
                          return;
  
                  }
  
  
  
                  int videoIndex = -1;
  
                  for(int i=0; i< avFormatCtx.nb_streams();i++)
  
                  {
  
                          if(avFormatCtx.streams(i).codec().codec_type() == avutil.AVMEDIA_TYPE_VIDEO)
  
                          {
  
                                  videoIndex = i;
  
                          }
  
                  }
  
                  // determ codec
  
                  avcodec.AVCodecContext avCodecCtx = avFormatCtx.streams(videoIndex).codec();
  
                  avcodec.AVCodec codec = avcodec.avcodec_find_decoder(avCodecCtx.codec_id());
  
                  if (codec == null)
  
                  {
  
                          System.out.println("codec not found");
  
                          return;
  
                  }
  
                  if(avcodec.avcodec_open2(avCodecCtx, codec, (AVDictionary)null) < 0)
  
                  {
  
                          System.out.println("cann't open avcodec\r\n");
  
                  }
  
                  avutil.AVFrame frame    = avcodec.avcodec_alloc_frame();
  
                  avutil.AVFrame frameRGB = avcodec.avcodec_alloc_frame();
  
                  int numByte = avcodec.avpicture_get_size(avutil.AV_PIX_FMT_RGB24, avCodecCtx.width(), avCodecCtx.height());
  
                  Pointer outBuffer = avutil.av_malloc(numByte);
  
                  
  
                  avcodec.avpicture_fill(new AVPicture(frameRGB), outBuffer.asByteBuffer(), avutil.AV_PIX_FMT_RGB24, avCodecCtx.width(), avCodecCtx.height());
  
                  avformat.av_dump_format(avFormatCtx, 0, file_path, 0);
  
                  System.out.println(avFormatCtx.duration());
  
                  SwsContext img_convert_ctx = swscale.sws_getContext(avCodecCtx.width(), avCodecCtx.height(), avCodecCtx.pix_fmt(), avCodecCtx.width(), avCodecCtx.height(), avutil.AV_PIX_FMT_RGB24, swscale.SWS_BICUBIC, null, null, (double[])null);
  
  
  
                  AVPacket pkt = new AVPacket();
  
                  int y_size = avCodecCtx.width()*avCodecCtx.height();
  
                  avcodec.av_new_packet(pkt, y_size);
  
                  opencv_highgui.cvNamedWindow(WINDOW_NAME);
  
                  
  
                  IplImage showImage = opencv_core.cvCreateImage(opencv_core.cvSize(avCodecCtx.width(), avCodecCtx.height()), opencv_core.IPL_DEPTH_8U, 3);
  
                  // read frames loop
  
                  int frameNumbers = avformat.av_read_frame(avFormatCtx, pkt);
  
              System.out.println("frame number is "+frameNumbers);
  
              
  
              while (avformat.av_read_frame(avFormatCtx, pkt) >= 0)
  
                  {
  
                      //System.out.println(pkt.asByteBuffer());
  
                          if (pkt.stream_index() == videoIndex)
  
                          {
  
                                  IntPointer ip = new IntPointer();
  
                                  int ret = avcodec.avcodec_decode_video2(avCodecCtx, frame, ip, pkt);
  
                                  if (ret < 0)
  
                                  {
  
                                          System.out.println("codec error\r\n");
  
                                          return;
  
                                  }
  
                                  
  
                                  if (ip.get()!= 0)
  
                                  {
  
                                          swscale.sws_scale(img_convert_ctx, frame.data(), frame.linesize(), 0, avCodecCtx.height(), frameRGB.data(), frameRGB.linesize());
  
                                          showImage.imageData(frameRGB.data(0));
  
                                          
  
                                          showImage.widthStep(frameRGB.linesize().get(0));
  
                                          opencv_highgui.cvShowImage(WINDOW_NAME, showImage);
  
                                          opencv_highgui.cvWaitKey(25);
  
                                  }
  
                          }
  
                  }
  
                  
  
                  showImage.release();
  
                  opencv_highgui.cvDestroyWindow(WINDOW_NAME);
  
                  avutil.av_free(frameRGB);
  
                  avcodec.avcodec_close(avCodecCtx);
  
                  avformat.avformat_close_input(avFormatCtx);

  but i run into get this error

  # A fatal error has been detected by the Java Runtime Environment:
  
  #
  
  #  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00000000767c35ed, pid=11884, tid=3960
  
  #
  
  # JRE version: 7.0_13-b20
  
  # Java VM: Java HotSpot(TM) 64-Bit Server VM (23.7-b01 mixed mode windows-amd64 compressed oops)
  
  # Problematic frame:
  
  # C  [avcodec-56.dll+0x4835ed]  avcodec_decode_video2+0xbd
  
  #
  
  # Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
  
  #
  
  # An error report file with more information is saved as:
  
  # E:\code\android\TestJAVACV\hs_err_pid11884.log
  
  #
  
  # If you would like to submit a bug report, please visit:
  
  #   http://bugreport.sun.com/bugreport/crash.jsp
  
  # The crash happened outside the Java Virtual Machine in native code.
  
  # See problematic frame for where to report the bug.
  
  #
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.29.100
  
    Duration: 00:08:30.27, start: 0.000000, bitrate: 160 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 960x540 [SAR 1:1 DAR 16:9], 28 kb/s, 15 fps, 15 tbr, 15 tbn, 30 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : SoundHandler

  and in the log file i found that the enden space heap in jvm has been used 98%. but I don’t know where is the issue, since the document of ffmpeg is not that enough, I feel difficult to know more about how to use it well ,any suggestions ??

  Heap
  
   PSYoungGen      total 23872K, used 20250K [0x00000000e5600000, 0x00000000e70a0000, 0x0000000100000000)
  
    eden space 20480K, 98% used [0x00000000e5600000,0x00000000e69c69f8,0x00000000e6a00000)

• What is the bitrate of my audio file based on ffmpeg output ?

  21 avril 2015, par blueether

  Is it the 40kb/s under Format, or is it the 16kb/s under Stream ? What is the relationship between the Format and the Stream ?
  The below output is for a file generated using Core Audio on an iphone, with an Audio Unit. The output format was specified by an AudioStreamBasicDescription descriptor

  Updated :
  Output from ffprobe -v error -show_format -show_streams 123_1429602551009.051025.m4a :

  [STREAM]
  
  index=0
  
  codec_name=aac
  
  codec_long_name=AAC (Advanced Audio Coding)
  
  profile=LC
  
  codec_type=audio
  
  codec_time_base=1/8000
  
  codec_tag_string=mp4a
  
  codec_tag=0x6134706d
  
  sample_fmt=fltp
  
  sample_rate=8000
  
  channels=1
  
  channel_layout=mono
  
  bits_per_sample=0
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/8000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=43008
  
  duration=5.376000
  
  bit_rate=16501
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=N/A
  
  nb_frames=42
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  TAG:creation_time=1970-04-16 22:36:01
  
  TAG:language=eng
  
  [/STREAM]
  
  [FORMAT]
  
  filename=123_1429602551009.051025.m4a
  
  nb_streams=1
  
  nb_programs=0
  
  format_name=mov,mp4,m4a,3gp,3g2,mj2
  
  format_long_name=QuickTime / MOV
  
  start_time=0.000000
  
  duration=5.376000
  
  size=27473
  
  bit_rate=40882
  
  probe_score=100
  
  TAG:major_brand=M4A
  
  TAG:minor_version=0
  
  TAG:compatible_brands=M4A mp42isom
  
  TAG:creation_time=1970-04-16 22:36:01
  
  TAG:iTunSMPB= 00000000 00000840 00000361 0000000000009C5F 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  
  [/FORMAT]