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• Try out the latest Piwik 3.0.0 beta version : Piwik 3.0.0 is almost here !

  15 novembre 2016, par Matthieu Aubry — Uncategorized

  Dear Piwik community,

  We are excited today to announce our publicly available Piwik 3.0.0 beta 3 release. We have been been working hard behind the scenes on the new 3.0.0 release for almost one year now. We, the passionate team at Piwik, are dedicated to bringing you a new and improved Piwik experience and invite you to join our beta channel to switch to Piwik 3 today !

  Enable the beta release channel

  Ready to enjoy a much faster Piwik experience and the magic of a modern user interface ? Follow the instructions here and you can upgrade to Piwik 3.0.0 beta in just one click.

  Please note that beta versions have a risk of containing bugs so we don’t recommend to use on a production server. If you find and report a bug in a beta version, we will aim to fix it as quickly as possible.

  Premium plugins in Piwik 3

  In the Piwik Marketplace you can discover & download plugins to enrich the functionality of your Piwik, as well as themes to change the look and feel of your Piwik user interface. The Marketplace integration was much improved in this new release, most notably : you can now purchase and download Premium plugins within Piwik !

  Important changes

  The Piwik 3 upgrade comes with some important changes that may require your attention which we detail in this blog post and in the developer changelog.

  The full list of more than 150 changes can be found in the Piwik 3 beta changelogs : beta 1, beta 2, beta 3.

  What to do next

  When you use the Piwik beta channel and if you come across any issues in Piwik such as a bug, feature missing, regression… let us know on our tracker and create a new issue so we can get this sorted.

  As we are in the final days of Piwik 3 development, we are looking forward to your feedback and help testing !

  Welcome to the future of Piwik,

  Happy Analytics !

• Detect audio silence in AVFrame using AutoGen for FFmpeg

  15 novembre 2016, par williamtroup

  I’m currently reading audio frames as follows :

  AVFrame* frame = ffmpeg.av_frame_alloc();
  
  
  
  while (ffmpeg.av_read_frame(formatContext, &packet) >= 0)
  
  {
  
      if (packet.stream_index == streamIndex)
  
      {
  
          while (packet.size > 0)
  
          {
  
              int frameDecoded;
  
              int frameDecodedResult = ffmpeg.avcodec_decode_audio4(codecContext, frame, &frameDecoded, packet);
  
  
  
              if (frameDecoded > 0 && frameDecodedResult >= 0)
  
              {
  
                  packet.data += totalBytesDecoded;
  
                  packet.size -= totalBytesDecoded;
  
              }
  
          }
  
  
  
          frameIndex++;
  
      }
  
  
  
      Avcodec.av_free_packet(&packet);
  
  }

  In this loop, I want to be able to detect if "frame" contains silent audio before doing anything with it. Is there a filter to do this ? Been struggling with this for a few days.

  Many thanks in advance.

• Send H.264 encoded stream through RTMP using FFmpeg

  15 novembre 2016, par Galaxy

  I followed this to encode a sequences images to h.264 video.

  Here is outputting part of my code :

  int srcstride = outwidth*4;
  
  sws_scale(convertCtx, src_data, &srcstride, 0, outheight, pic_in.img.plane, pic_in.img.i_stride);
  
  x264_nal_t* nals;
  
  int i_nals;
  
  int frame_size = x264_encoder_encode(encoder, &nals, &i_nals, &pic_in, &pic_out);
  
  if (frame_size) {
  
      fwrite(nals[0].p_payload, frame_size, 1, fp);
  
  }

  This is in a loop to process frames and write them into a file.

  Now, I’m trying to stream these encoded frames through RTMP. As I know, the container for the RTMP is FLV. So I used command line as a trial :

  ffmpeg -i test.h264 -vcodec copy -f flv rtmp://localhost:1935/hls/test

  This one works well as streaming a h.264 encoded video file.

  But how can I implement it as C++ code and stream the frames at the same time when they are generated, just like what I did to stream my Facetime camera.

  ffmpeg -f avfoundation -pix_fmt uyvy422  -video_size 1280x720 -framerate 30 -i "1:0" -pix_fmt yuv420p -vcodec libx264 -preset veryfast -acodec libvo_aacenc -f flv -framerate 30 rtmp://localhost:1935/hls/test

  This may be a common and practical topic. But I’m stuck here for days, really need some relevant exprience. Thank you !