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• The new GDPR data protection regulation and potential consequences on Piwik

  7 septembre 2017, par Piwik Core Team — About, Privacy

  GDPR is a new data protection related regulation in Europe. GDPR stands for General Data Protection Regulation.

  The purpose of this European regulation is to strengthen and unify data protection for all individuals within the European Union. This also includes entities outside Europe willing to do business with European citizens. GDPR is a set of processes you need to follow within your organization to protect the privacy of European citizens.

  GDPR will start to apply in May 2018. It is recognized to be dissuasive because of the potential penalty of up to 4% of the yearly turnover, in case of infringement.

  Many articles have been written about GDPR including our previous article. Few of them are explaining how it will affect web analytics vendors : this is what this article is about.

  Am I really impacted by GDPR if I am a Piwik user ?

  As Piwik can collect personal data, the answer is yes. Piwik analytics data is impacted by the GDPR.

  As GDPR is a general concept, we decided from the official guidelines to assume what will be the potential consequences on the use of Piwik.

  There are 2 potential scenarios we can identify :

  • 1 – You are collecting personal data with Piwik
  • 2 – You are not collecting personal data with Piwik

  1 – Personal data collection with Piwik

  According to GDPR : IP addresses, cookies, UserID are personal data.

  IP addresses are personal data, so you will have to anonymize them unless you receive explicit consent from the visitor. Please view the following article in order to learn : how can I anonymize IP addresses in Piwik ?

  According to GDPR, cookies are personal data too. But as all cookies are not created equal it may be possible that some need to require user consent whereas other not. Whatever will be the final decision, you can learn about the first-party cookies created by Piwik and how to disable all tracking cookies in Piwik ?

  User ID, you are impacted if the User ID you assign is specific to an individual or if you can cross the User ID data further and find back the individual personal data.

  Any extra personal data you may collect with Piwik, it could be for example : first names, family names, e-mail address… You are able to collect such data using custom dimensions, custom variables…

  What are the rules I have to comply with ?

  By collecting personal data, you will have to respect EU citizens rights, which include :

  • The possibility for them to view the data you collected on them
  • The possibility to rectify some data concerning them
  • The possibility to delete their data when they request about it

  As you can imagine, for the first obligation, you will have to export all the data. So if a user is requesting it, you will have to export the data linked to his IP address(es). It can be easily exported as a .csv file for example.
  In order to do that, just create a segment according to the IP address of the user who requested it and then export the “Visitor log” report.
  If the personal data is not linked with the IP address but other attributes such as User ID or a custom dimension, you can provide the same data export by using the segment function and filtering on the personal data field.

  The data edit and deletion process on Piwik is a bit trickier as it currently requires administration system skills. We are planning to develop a new plugin for GDPR compliance (which will be available for free on the Marketplace). This plugin will let you edit and easily delete data of a particular user. Currently you can delete a specific user’s data by accessing the Piwik database and directly delete the different records for this specific user.

  2 – You are not collecting personal data with Piwik

  Unfortunately it is not because you do not collect personal data that you will not be affected by GDPR.
  The details of GDPR are not confirmed yet and GDPR could involve enabling the DoNotTrack setting by default on all browsers.
  Yes, you read it well, by default, unless the internet user uncheck this option, Piwik respecting DoNoTrack would not be able to track any user. If one needed to collect data anyway, Piwik Log Analytics and server-side tracking can be considered.

  If you need help regarding how to set up your Piwik installation in order to be GDPR compliant :

  Contact us

  Do you have a Piwik experience you would like to share with the community ? Please share it with us by contacting Piwik core team.

• What to pass to avcodec_decode_video2 for H.264 Transport Stream ?

  29 novembre 2016, par Danny

  I want to decode H.264 video from a collection of MPEG-2 Transport Stream packets but I am not clear what to pass to avcodec_decode_video2

  The documentation says to pass "the input AVPacket containing the input buffer."

  But what should be in the input buffer ?

  A PES packet will be spread across the payload portion of several TS packets, with NALU(s) inside the PES. So pass a TS fragment ? The entire PES ? PES payload only ?

  This Sample Code mentions :

  BUT some other codecs (msmpeg4, mpeg4) are inherently frame based, so
  you must call them with all the data for one frame exactly. You must
  also initialize ’width’ and ’height’ before initializing them.

  But I can find no info on what "all the data" means...

  Passing a fragment of a TS packet payload is not working :

  AVPacket avDecPkt;
  
  av_init_packet(&avDecPkt);
  
  avDecPkt.data = inbuf_ptr;
  
  avDecPkt.size = esBufSize;
  
  
  
  len = avcodec_decode_video2(mpDecoderContext, mpFrameDec, &got_picture, &avDecPkt);
  
  if (len < 0)
  
  {
  
      printf("  TS PKT #%.0f. Error decoding frame #%04d [rc=%d '%s']\n",
  
          tsPacket.pktNum, mDecodedFrameNum, len, av_make_error_string(errMsg, 128, len));
  
      return;
  
  }

  output

  [h264 @ 0x81cd2a0] no frame!
  
  TS PKT #2973. Error decoding frame #0001 [rc=-1094995529 'Invalid data found when processing input']

  EDIT

  Using the excellent hits from WLGfx, I made this simple program to try decoding TS packets. As input, I prepared a file containing only TS packets from the Video PID.

  It feels close but I don’t know how to set up the FormatContext. The code below segfaults at av_read_frame() (and internally at ret = s->iformat->read_packet(s, pkt)). s->iformat is zero.

  Suggestions ?

  EDIT II - Sorry, for got post source code **
  **EDIT III - Sample code updated to simulate reading TS PKT Queue

  /*
  
   * Test program for video decoder
  
   */
  
  
  
  #include 
  
  #include 
  
  #include 
  
  #include 
  
  
  
  extern "C" {
  
  
  
  #ifdef __cplusplus
  
      #define __STDC_CONSTANT_MACROS
  
      #ifdef _STDINT_H
  
          #undef _STDINT_H
  
      #endif
  
      #include 
  
  #endif
  
  }
  
  
  
  extern "C" {
  
  #include "libavcodec/avcodec.h"
  
  #include "libavformat/avformat.h"
  
  #include "libswscale/swscale.h"
  
  #include "libavutil/imgutils.h"
  
  #include "libavutil/opt.h"
  
  }
  
  
  
  
  
  class VideoDecoder
  
  {
  
  public:
  
      VideoDecoder();
  
      bool rcvTsPacket(AVPacket &inTsPacket);
  
  
  
  private:
  
      AVCodec         *mpDecoder;
  
      AVCodecContext  *mpDecoderContext;
  
      AVFrame         *mpDecodedFrame;
  
      AVFormatContext *mpFmtContext;
  
  
  
  };
  
  
  
  VideoDecoder::VideoDecoder()
  
  {
  
      av_register_all();
  
  
  
      // FORMAT CONTEXT SETUP
  
      mpFmtContext = avformat_alloc_context();
  
      mpFmtContext->flags = AVFMT_NOFILE;
  
      // ????? WHAT ELSE ???? //
  
  
  
      // DECODER SETUP
  
      mpDecoder = avcodec_find_decoder(AV_CODEC_ID_H264);
  
      if (!mpDecoder)
  
      {
  
          printf("Could not load decoder\n");
  
          exit(11);
  
      }
  
  
  
      mpDecoderContext = avcodec_alloc_context3(NULL);
  
      if (avcodec_open2(mpDecoderContext, mpDecoder, NULL) < 0)
  
      {
  
          printf("Cannot open decoder context\n");
  
          exit(1);
  
      }
  
  
  
      mpDecodedFrame = av_frame_alloc();
  
  }
  
  
  
  bool
  
  VideoDecoder::rcvTsPacket(AVPacket &inTsPkt)
  
  {
  
      bool ret = true;
  
  
  
      if ((av_read_frame(mpFmtContext, &inTsPkt)) < 0)
  
      {
  
          printf("Error in av_read_frame()\n");
  
          ret = false;
  
      }
  
      else
  
      {
  
          // success.  Decode the TS packet
  
          int got;
  
          int len = avcodec_decode_video2(mpDecoderContext, mpDecodedFrame, &got, &inTsPkt);
  
          if (len < 0)
  
              ret = false;
  
  
  
          if (got)
  
              printf("GOT A DECODED FRAME\n");
  
      }
  
  
  
      return ret;
  
  }
  
  
  
  int
  
  main(int argc, char **argv)
  
  {
  
      if (argc != 2)
  
      {
  
          printf("Usage: %s tsInFile\n", argv[0]);
  
          exit(1);
  
      }
  
  
  
      FILE *tsInFile = fopen(argv[1], "r");
  
      if (!tsInFile)
  
      {
  
          perror("Could not open TS input file");
  
          exit(2);
  
      }
  
  
  
      unsigned int tsPktNum = 0;
  
      uint8_t      tsBuffer[256];
  
      AVPacket     tsPkt;
  
      av_init_packet(&tsPkt);
  
  
  
      VideoDecoder vDecoder;
  
  
  
      while (!feof(tsInFile))
  
      {
  
          tsPktNum++;
  
  
  
          tsPkt.size = 188;
  
          tsPkt.data = tsBuffer;
  
          fread(tsPkt.data, 188, 1, tsInFile);
  
  
  
          vDecoder.rcvTsPacket(tsPkt);
  
      }
  
  }

• ffmpeg doesn't show download progress [closed]

  10 mars 2013, par Siddharth Ramakrishnan

  I run a mp3 site which converts video to mp3 from youtube and i have working script which works well on my another server. Recently changed my server and found that it is not showing download progress when downloading song from youtube instead it shows white page untill in downloads and then display the conversion progress. Confirmed with my site coder and he said that it is not php error. Error with ur server.

  You can check it here http://mp3world.mobi/details.php?code=jVl5s1e0Oo4&name=Chester+See+-+God+Damn+You%27re+Beautiful+%28Official+Music+Video%29

  I am unable to figure it out. Can anyone help me in this.