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• A *hot* Piwik Community Meetup 2015 !

  10 août 2015, par André Bräkling — Community

  Last weekend I arrived in Germany to attend the Piwik Community Meetup 2015 and now I am in Poland.

  The meetup was HOT in every sense ! Berlin temperatures reached 35 degrees (celsius), as I finally meet in person several long-time, dedicated Piwik community contributors.

  

  Meetup preparation in Berlin, photo by M. Zawadziński, licensed under CC-BY-SA 4.0

  Pictures from the meetup preparation sessions
  

  In the first leg of my trip I was in Berlin to meet Piwik community members to prepare for the 2015 annual Piwik community meetup. These are my notes taken during the meeting at the request of one of my colleagues. I also relayed live on Framasphère, Twitter and IRC.

  

  Community discussion at the meetup, photo by D.Czajka, licensed under CC-BY-SA 4.0

  More pictures from the Piwik meetup
  

  This was harder than I expected, as I took notes with my laptop, pictures with my phone, wrote live to social media (using the Android Diaspora Native Web App), and used my laptop to relay on IRC. Going forward this requires better preparation, I was glad I had a few links and pictures ready before hand but it really requires intense focus to achieve this. I am glad presenters were patient when I requested repeating some of the ideas they shared. I am also a bit disappointed not much happened in IRC.

  Two day preparation sessions

  The discussions and session we had during the two days prior to the meetup are available here.

  We gathered in rented apartments in Berlin, this reminded me very much of similar community gatherings and perhaps of BarCamp and, at a much smaller scale, UDS sessions.

  

  Piwik Pizza !, photo by F. Rodríguez, licensed under CC-BY-SA 4.0

  A list of ideas of topics was initially submitted, we then proceeded to have scheduled sessions for open discussion. Several people shared their concern there was no possible remote participation which led to making public the Trello boards used/linked here.

  Note : The Trello links below still have action items and notes that are pending bug report / feature requests filing which should happen over the coming weeks. Most importantly, many action items will need identifying leads for different community team including Translations and Documentation, and better coordination of coming community engagement.

  Monday sessions consisted of the following subjects :

  • What are Piwik values & how to communicate them ? (see below for details)
  • How to encourage and recognize new external contributors ?
  • How could we double the Piwik userbase ?
  • How Community can organise help resources

  On Tuesday we met again to discuss the following subjects :

  • Piwik Long Term support (LTS)
  • How do Piwik.org (project) and Piwik PRO (company) sit together / are organized ? – An important part of this session was about having better communication channels and improving the new team page (bug #8520 and bug #8519, respectively)
  • Improving usability of Piwik e.g. for new users – this last session was not held has we ran out of time and prepared to go to the meetup venue.

  Some more details about individual preparation sessions

  What are Piwik values & how to communicate them ?

  The main subjects in this session were important changes proposed in the project mission and values. This was edited directly on on the wiki page on GitHub, some of the changes can be seen by comparing revisions.

  Piwik mission statement (bug #7376)

  “To create the leading Free and open source analytics platform, and to support global organisations and communities to keep full control over their data.”

  Our values

  • Openness
  • Freedom
  • Transparency
  • Data ownership
  • Privacy
  • Kaizen (改善) : continuous improvement

  This was also presented by Matthieu Aubry at the meetup and is published in the Roadmap page. Bringing more visibility and perhaps having a top page for Mission and Values was also brought up.

  Meetup agenda and notes

  The official agenda is available here.

  Many Piwik PRO employees stayed in Berlin for the meetup, and we had good participation although less than last year in Munich as my colleagues told me. Some were consultants, others staff from public organizations, universities, etc. In retrospect considering the very hot weather and summer holidays the attendance was good. I was very happy to arrive at the beautiful Kulturbrauerei and enter the air-conditioned Soda Club. T-Shirts were waiting for all attendees and free drinks (non-alcohol !) were welcome

• How to resample an audio with ffmpeg API ?

  13 mai 2016, par tangren

  I’d like to decode audio file(.wav .aac etc.) into raw data(pcm) and then resample it with ffmpeg API.

  I try to do it with the help of the official examples. However, the result file always loses a little data at the end of the file compared to the file generated by ffmpeg command :

  ffmpeg -i audio.wav -f s16le -ac 1 -ar 8000 -acodec pcm_s16le out.pcm.

  In this case, the input audio metadata : pcm_s16le, 16000 Hz, 1 channels, s16, 256 kb/s

  And there are 32 bites lost at the end of result file.

  What’s more, I’d like to process audios in memory, so how do I calculate the size of audio’s raw data (pcm) ?

  My code :

  #include <libavutil></libavutil>opt.h>
  
  #include <libavutil></libavutil>imgutils.h>
  
  #include <libavutil></libavutil>samplefmt.h>
  
  #include <libavutil></libavutil>timestamp.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libavutil></libavutil>channel_layout.h>
  
  #include <libswresample></libswresample>swresample.h>
  
  
  
  int convert_to_PCM(const char* src_audio_filename, const char* dst_pcm_filename, int dst_sample_rate)
  
  {
  
      FILE *audio_dst_file = NULL;
  
  
  
      // for demuxing and decoding
  
      int ret = 0, got_frame, decoded, tmp;
  
      AVFormatContext *fmt_ctx = NULL;
  
      AVCodecContext *audio_dec_ctx;
  
      AVStream *audio_stream = NULL;
  
      int audio_stream_idx = -1;
  
      AVFrame *frame = NULL;
  
      AVPacket pkt;
  
  
  
      // for resampling
  
      struct SwrContext *swr_ctx = NULL;
  
      int src_sample_rate;
  
      uint8_t **dst_data = NULL;
  
      int dst_nb_samples, max_dst_nb_samples;
  
      enum AVSampleFormat src_sample_fmt, dst_sample_fmt = AV_SAMPLE_FMT_S16;
  
      int nb_channels = 1;
  
      int dst_bufsize, dst_linesize;
  
      int64_t src_ch_layout, dst_ch_layout;
  
      dst_ch_layout = src_ch_layout = av_get_default_channel_layout(1);
  
  
  
      av_register_all();
  
  
  
      if (avformat_open_input(&amp;fmt_ctx, src_audio_filename, NULL, NULL) &lt; 0) {
  
          fprintf(stderr, "Could not open source file %s\n", src_audio_filename);
  
          return 1;
  
      }
  
  
  
      /* retrieve stream information */
  
      if (avformat_find_stream_info(fmt_ctx, NULL) &lt; 0) {
  
          fprintf(stderr, "Could not find stream information\n");
  
          return 1;
  
      }
  
  
  
      if (open_codec_context(&amp;audio_stream_idx, fmt_ctx, AVMEDIA_TYPE_AUDIO) >= 0) {
  
          audio_stream = fmt_ctx->streams[audio_stream_idx];
  
          audio_dec_ctx = audio_stream->codec;
  
          audio_dst_file = fopen(dst_pcm_filename, "wb");
  
          if (!audio_dst_file) {
  
              fprintf(stderr, "Could not open destination file %s\n", dst_pcm_filename);
  
              ret = 1;
  
              goto end;
  
          }
  
      }
  
  
  
      /* dump input information to stderr */
  
      av_dump_format(fmt_ctx, 0, src_audio_filename, 0);
  
  
  
      if (!audio_stream) {
  
          fprintf(stderr, "Could not find audio stream in the input, aborting\n");
  
          ret = 1;
  
          goto end;
  
      }
  
  
  
      src_sample_rate = audio_dec_ctx->sample_rate;
  
      if (src_sample_rate != dst_sample_rate) {
  
          /* create resampler context */
  
          swr_ctx = swr_alloc();
  
          if (!swr_ctx) {
  
              fprintf(stderr, "Could not allocate resampler context\n");
  
              ret = AVERROR(ENOMEM);
  
              goto end;
  
          }
  
          src_sample_fmt = audio_dec_ctx->sample_fmt;
  
  
  
  
  
          /* set options */
  
          av_opt_set_int(swr_ctx, "in_channel_layout",    src_ch_layout, 0);
  
          av_opt_set_int(swr_ctx, "in_sample_rate",       src_sample_rate, 0);
  
          av_opt_set_sample_fmt(swr_ctx, "in_sample_fmt", src_sample_fmt, 0);
  
  
  
          av_opt_set_int(swr_ctx, "out_channel_layout",    dst_ch_layout, 0);
  
          av_opt_set_int(swr_ctx, "out_sample_rate",       dst_sample_rate, 0);
  
          av_opt_set_sample_fmt(swr_ctx, "out_sample_fmt", dst_sample_fmt, 0);
  
  
  
          /* initialize the resampling context */
  
          if ((ret = swr_init(swr_ctx)) &lt; 0) {
  
              fprintf(stderr, "Failed to initialize the resampling context\n");
  
              goto end;
  
          }
  
  
  
      }
  
  
  
      frame = av_frame_alloc();
  
      if (!frame) {
  
          fprintf(stderr, "Could not allocate frame\n");
  
          ret = AVERROR(ENOMEM);
  
          goto end;
  
      }
  
  
  
      /* initialize packet, set data to NULL, let the demuxer fill it */
  
      av_init_packet(&amp;pkt);
  
      pkt.data = NULL;
  
      pkt.size = 0;
  
  
  
      printf("Convert audio from file '%s' into '%s'\n", src_audio_filename, dst_pcm_filename);
  
  
  
      /* read frames from the file */
  
      while (av_read_frame(fmt_ctx, &amp;pkt) >= 0) {
  
          AVPacket orig_pkt = pkt;
  
          do {
  
              decoded = pkt.size;
  
              got_frame = 0;
  
              tmp = 0;
  
              /* decode audio frame */
  
              tmp = avcodec_decode_audio4(audio_dec_ctx, frame, &amp;got_frame, &amp;pkt);
  
              if (tmp &lt; 0) {
  
                  fprintf(stderr, "Error decoding audio frame (%s)\n", av_err2str(tmp));
  
                  break;
  
              }
  
              decoded = FFMIN(tmp, pkt.size);
  
              if (got_frame) {
  
                  if (swr_ctx) {
  
                      if (dst_data == NULL) {
  
                          max_dst_nb_samples = dst_nb_samples = av_rescale_rnd(frame->nb_samples, dst_sample_rate, src_sample_rate, AV_ROUND_UP);
  
                          ret = av_samples_alloc_array_and_samples(&amp;dst_data, &amp;dst_linesize, nb_channels,
  
                                                                  dst_nb_samples, dst_sample_fmt, 0);
  
                          if (ret &lt; 0) {
  
                              fprintf(stderr, "Could not allocate destination samples\n");
  
                              goto end;
  
                          }
  
                      }
  
                      dst_nb_samples = av_rescale_rnd(swr_get_delay(swr_ctx, src_sample_rate) + frame->nb_samples, dst_sample_rate, src_sample_rate, AV_ROUND_UP);
  
                      if (dst_nb_samples > max_dst_nb_samples) {
  
                          av_freep(&amp;dst_data[0]);
  
                          ret = av_samples_alloc(dst_data, &amp;dst_linesize, nb_channels, dst_nb_samples, dst_sample_fmt, 1);
  
                          if (ret &lt; 0)
  
                              break;
  
                          max_dst_nb_samples = dst_nb_samples;
  
                      }
  
  
  
                      /* convert to destination format */
  
                      ret = swr_convert(swr_ctx, dst_data, dst_nb_samples, (const uint8_t **)frame->data, frame->nb_samples);
  
                      if (ret &lt; 0) {
  
                          fprintf(stderr, "Error while converting\n");
  
                          goto end;
  
                      }
  
                      dst_bufsize = av_samples_get_buffer_size(&amp;dst_linesize, nb_channels, ret, dst_sample_fmt, 1);
  
                      if (dst_bufsize &lt; 0) {
  
                          fprintf(stderr, "Could not get sample buffer size\n");
  
                          goto end;
  
                      }
  
                      printf("Decoded size: %d, dst_nb_samples: %d, converted size: %d, sample buffer size: %d\n", decoded, dst_nb_samples, ret, dst_bufsize);
  
                      fwrite(dst_data[0], 1, dst_bufsize, audio_dst_file);
  
                  }
  
                  else {
  
                      size_t unpadded_linesize = frame->nb_samples * av_get_bytes_per_sample(frame->format);
  
                      fwrite(frame->extended_data[0], 1, unpadded_linesize, audio_dst_file);
  
                  }
  
              }
  
  
  
              if (decoded &lt; 0)
  
                  break;
  
              pkt.data += tmp;
  
              pkt.size -= tmp;
  
          } while (pkt.size > 0);
  
          av_packet_unref(&amp;orig_pkt);
  
      }
  
  
  
      printf("Convert succeeded.\n");
  
  
  
  end:
  
      avcodec_close(audio_dec_ctx);
  
      avformat_close_input(&amp;fmt_ctx);
  
      if (audio_dst_file)
  
          fclose(audio_dst_file);
  
      av_frame_free(&amp;frame);
  
      if (dst_data)
  
          av_freep(&amp;dst_data[0]);
  
      av_freep(&amp;dst_data);
  
      swr_free(&amp;swr_ctx);
  
  
  
      return ret;
  
  }
  
  
  
  static int open_codec_context(int *stream_idx,
  
                              AVFormatContext *fmt_ctx, enum AVMediaType type)
  
  {
  
      int ret, stream_index;
  
      AVStream *st;
  
      AVCodecContext *dec_ctx = NULL;
  
      AVCodec *dec = NULL;
  
      AVDictionary *opts = NULL;
  
  
  
      ret = av_find_best_stream(fmt_ctx, type, -1, -1, NULL, 0);
  
      if (ret &lt; 0) {
  
          fprintf(stderr, "Could not find %s stream in input file.\n",
  
                  av_get_media_type_string(type));
  
          return ret;
  
      } else {
  
          stream_index = ret;
  
          st = fmt_ctx->streams[stream_index];
  
  
  
          /* find decoder for the stream */
  
          dec_ctx = st->codec;
  
          dec = avcodec_find_decoder(dec_ctx->codec_id);
  
          if (!dec) {
  
              fprintf(stderr, "Failed to find %s codec\n",
  
                      av_get_media_type_string(type));
  
              return AVERROR(EINVAL);
  
          }
  
  
  
          if ((ret = avcodec_open2(dec_ctx, dec, &amp;opts)) &lt; 0) {
  
              fprintf(stderr, "Failed to open %s codec\n",
  
                      av_get_media_type_string(type));
  
              return ret;
  
          }
  
          *stream_idx = stream_index;
  
      }
  
  
  
      return 0;
  
  }
  
  
  
  static int get_format_from_sample_fmt(const char **fmt,
  
                                      enum AVSampleFormat sample_fmt)
  
  {
  
      int i;
  
      struct sample_fmt_entry {
  
          enum AVSampleFormat sample_fmt; const char *fmt_be, *fmt_le;
  
      } sample_fmt_entries[] = {
  
          { AV_SAMPLE_FMT_U8,  "u8",    "u8"    },
  
          { AV_SAMPLE_FMT_S16, "s16be", "s16le" },
  
          { AV_SAMPLE_FMT_S32, "s32be", "s32le" },
  
          { AV_SAMPLE_FMT_FLT, "f32be", "f32le" },
  
          { AV_SAMPLE_FMT_DBL, "f64be", "f64le" },
  
      };
  
      *fmt = NULL;
  
  
  
      for (i = 0; i &lt; FF_ARRAY_ELEMS(sample_fmt_entries); i++) {
  
          struct sample_fmt_entry *entry = &amp;sample_fmt_entries[i];
  
          if (sample_fmt == entry->sample_fmt) {
  
              *fmt = AV_NE(entry->fmt_be, entry->fmt_le);
  
              return 0;
  
          }
  
      }
  
  
  
      fprintf(stderr,
  
              "sample format %s is not supported as output format\n",
  
              av_get_sample_fmt_name(sample_fmt));
  
      return -1;
  
  }

• Join us at MatomoCamp 2024 world tour edition

  13 novembre 2024, par Daniel Crough — Uncategorized

  Join us at MatomoCamp 2024 world tour edition, our online conference dedicated to Matomo Analytics—the leading open-source web analytics platform that prioritises data privacy.

  • 🗓️ Date : 14 November 2024
  • 🌐 Format : 24-hour virtual conference accessible worldwide
  • 💰 Cost : Free and no need to register

  Event highlights

  Opening ceremony

  Begin the day with a welcome from Ronan Chardonneau, co-organiser of MatomoCamp and customer success manager at Matomo.

  View session | iCal link

  Keynote : “Matomo by its creator”

  Attend a special session with Matthieu Aubry, the founder of Matomo Analytics. Learn about the platform’s evolution and future developments.

  View session | iCal link

  Explore MatomoCamp 2024’s diverse tracks and topics

  MatomoCamp 2024 offers a wide range of topics across several tracks, including using Matomo, integration, digital analytics, privacy, plugin development, system administration, business, other free analytics, use cases, and workshops and panel talks.

  Featured sessions

  1. Using AI to fetch raw data with Python

  Speaker : Ralph Conti
  Time : 14 November, 12:00 PM UTC

  Discover how to combine AI and Matomo’s API to create unique reporting solutions. Leverage Python for advanced data analysis and unlock new possibilities in your analytics workflow.

  View session | iCal link

  2. Supercharge Matomo event tracking with custom reports

  Speaker : Thomas Steur
  Time : 14 November, 2:00 PM UTC

  Learn how to enhance event tracking and simplify data analysis using Matomo’s custom reports feature. This session will help you unlock the full potential of your event data.

  View session | iCal link

  3. GDPR with AI and AI Act

  Speaker : Stefanie Bauer
  Time : 14 November, 4:00 PM UTC

  Navigate the complexities of data protection requirements for AI systems under GDPR. Explore the implications of the new AI Act and receive practical tips for compliance.

  View session | iCal link

  4. A new data mesh era !

  Speaker : Jorge Powers
  Time : 14 November, 4:00 PM UTC

  Explore how Matomo supports the data mesh approach, enabling decentralised data ownership and privacy-focused analytics. Learn how to empower teams to manage and analyse data without third-party reliance.

  View session | iCal link

  5. Why Matomo has to create a MTM server side : The future of data privacy and user tracking

  Panel discussion
  Time : 14 November, 6:00 PM UTC

  Join experts in a discussion on the necessity of server-side tag management for enhanced privacy and compliance. Delve into the future of data privacy and user tracking.

  View session | iCal link

  6. Visualisation of Matomo data using external tools

  Speaker : Leticia Rodríguez Morado
  Time : 14 November, 8:00 PM UTC

  Learn how to create compelling dashboards using Grafana and Matomo data. Enhance your data visualisation skills and gain better insights.

  View session | iCal link

  7. Keep it simple : Tracking what matters with Matomo

  Speaker : Scott Fillman
  Time : 14 November, 9:00 PM UTC

  Discover how to focus on essential metrics and simplify your analytics setup for more effective insights. Learn tactics for a powerful, streamlined Matomo configuration.

  View session | iCal link

  Stay connected

  Stay updated with the latest news and announcements :

  • Twitter : @MatomoCamp
  • YouTube : @MatomoCamp
  • Official website : matomocamp.org

  Don’t miss out

  MatomoCamp 2024 world tour edition is more than a conference ; it’s a global gathering shaping the future of ethical analytics. Whether you aim to enhance your skills, stay informed about industry trends, or network with professionals worldwide, this event offers valuable opportunities.