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• We are hiring engineers to build an awesome product and platform used by millions of people

  16 février 2016, par Piwik Core Team — Uncategorized

  Are you ready for a new challenge ? Or maybe you know someone who is looking for a change ? We have some exciting problems to solve and are looking for senior developers to work with us and our community on our open source Piwik Analytics platform. Piwik is used by more than one million websites all over the world. It is deployed on more than 300.000 servers and some users track more than 1 billion actions per month.

  What is it like to work on Piwik ?

  We develop this software using modern PHP, MySQL, Redis, AngularJS and more. We provide several kind of APIs and a plugin architecture to allow developers to extend and change Piwik to their needs. However, we would not be Piwik if we stopped at this point ! We want to turn Piwik into an even more awesome product and platform.
  You can imagine there is a lot to do and many challenges to face !

  While one part is to always make Piwik scale better and to improve UI and UX, we also want to provide simple APIs to make the life of developers as pleasant as possible. We aim to solve things the right way and our thousands of unit, integration, system, JavaScript and screenshot tests help us to innovate and to not be afraid of change. We like clean code and constant improvements.

  The Piwik team lives in New Zealand and Europe (Germany). We do the vast majority of our collaboration online. Our values include being open, transparent and sharing knowledge. For this we use tools like GitHub and Slack to communicate and Quake servers to take our minds off complex challenges. We are a small, flexible team, so when you come aboard, you will play an integral part in engineering and have a big impact on the product loved by so many people. You’ll help to create a welcoming environment for new contributors and set an example with your development practices and communications skills.

  Apply now, or spread the word !

  If you have strong skills in PHP send us an email with your CV and tell us a little about yourself and your experience in engineering complex applications.

  Apply for a job here http://piwik.org/jobs/ and if you’re maybe not the right candidate, contribute to the project by sharing this blog post and by sending it to your friends !

• How to get audio peaks with FFmpeg ?

  2 septembre 2020, par hmak.me

  I am working on a music app and need to generate audio spectrum for my files. Like this one :

  



  

  



  So I tried using audiowaveform like this :

  



  audiowaveform -i music.mp3 --pixels-per-second 1 -o out.dat


  



  which gives me the following results[correct results] : [the first 10 words are meta data]

  



  0000000 0001 0000 0000 0000 bb80 0000 bb80 0000
0000020 00f9 0000 df3e 1fa2 e22c 1ef3 e0bb 1e5a
0000040 e099 1e88 dfcf 1c33 e29f 1d4c e055 1f80
0000060 df63 1e3a e1b4 1f31 e271 1d81 e0e5 1b1c
0000100 e06d 1be4 dee2 1cb0 e118 1da1 e026 1dea
0000120 e055 1dac df9b 1dbf e0c3 2063 ded4 21b2
0000140 dec9 1f8d de5b 20c8 e02d 216a dd7e 21af
0000160 dea1 20ac de6c 2170 de80 1e12 de6f 1fb9
0000200 dde3 2106 e0d9 21be de88 218c de81 1f9f
0000220 decb 20ff deb2 1edc df32 20c4 dde7 ...


  



  But when I do this kind of job with FFmpeg :

  



  ffmpeg -y -i music.mp3 -acodec pcm_s16le -f s16le -ac 1 -ar 1 -v quiet out.pcm


  



  that gives the following results, which is not same at all :

  



  0000000 0001 fffe fffe fffe 0000 ffff fffd 0000
0000020 ffff ffff fffe 0001 0001 fffd 0001 fffe
0000040 0002 fffe fffc 0002 ffff fffc fffe 000b
0000060 0007 fffb 0004 0001 ffff fffd ffff 0002
0000100 0008 0006 fffe ffff 0001 0000 0003 000a
0000120 fffd ffff 0004 ffff 0001 ffff fffd ffff
0000140 fffe ffff 0001 fffd fffe 0000 fffb 0002
0000160 0002 0000 fffe 0000 fffb fffe fffe 0000
0000200 ffff 0000 ffff fffc 0002 0003 0005 0003
0000220 0002 fffb fffb fffa fffa 0004 0009 ...


  



  You may wonder that why am i doing -ar 1 or --pixels-per-second 1 ? This is because I want to draw a line for each second, so I need to get peak for each second. . I don't know what am I missing there but I expect to get the same results from FFmpeg.

  


• ffmpeg : convert audio-only flv to swf

  30 janvier 2019, par Michael Brewer-Davis

  My Flex application records audio-only FLV files using red5—I’d like to convert these to SWF files so I can embed them in other SWF files. (I could also convert to MP3 and then embed them into SWFs myself, but I’d prefer a one step solution.)

  Anyone have experience doing this ?

  What I’ve tried :

  The following naive ffmpeg command fails :

  > ffmpeg -i 3139747641.flv -vn movie.swf
  
  FFmpeg version SVN-r21751-snapshot, Copyright (c) 2000-2010 Fabrice Bellard, et al.
  
    built on Feb 11 2010 09:15:42 with gcc 4.2.1 (SUSE Linux)
  
    configuration: --enable-gpl --enable-nonfree
  
    libavutil     50. 9. 0 / 50. 9. 0
  
    libavcodec    52.53. 0 / 52.53. 0
  
    libavformat   52.52. 0 / 52.52. 0
  
    libavdevice   52. 2. 0 / 52. 2. 0
  
    libswscale     0.10. 0 /  0.10. 0
  
  [flv @ 0x8a5e3a0]Could not find codec parameters (Video: 0x0000)
  
  [flv @ 0x8a5e3a0]Estimating duration from bitrate, this may be inaccurate
  
  Input #0, flv, from '3139747641.flv':
  
    Metadata:
  
      audiocodecid    : -1
  
      duration        : 0
  
      videocodecid    : -1
  
      canSeekToEnd    : true
  
    Duration: 00:00:14.88, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: 0x0000, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: nellymoser, 8000 Hz, mono, s16
  
  Output #0, swf, to 'movie.swf':
  
      Stream #0.0: Audio: 0x0000, 8000 Hz, mono, s16, 64 kb/s
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
  Encoder (codec id 86017) not found for output stream #0.0

  I’ve tried adding a dummy video, but this also failed :

  > ffmpeg -i dummy.mov -i 3139747641.flv movie.swf
  
      
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'dummy.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 512
  
      compatible_brands: qt  
  
      encoder         : Lavf52.52.0
  
      encoder-eng     : Lavf52.52.0
  
    Duration: 00:00:00.10, start: 0.000000, bitrate: 62 kb/s
  
      Stream #0.0(eng): Video: mpeg4, yuv420p, 10x10 [PAR 1:1 DAR 1:1], 1 kb/s, 10 fps, 10 tbr, 10 tbn, 10 tbc
  
  [flv @ 0x8a67fa0]Could not find codec parameters (Video: 0x0000)
  
  [flv @ 0x8a67fa0]Estimating duration from bitrate, this may be inaccurate
  
  Input #1, flv, from '3139747641.flv':
  
    Metadata:
  
      audiocodecid    : -1
  
      duration        : 0
  
      videocodecid    : -1
  
      canSeekToEnd    : true
  
    Duration: 00:00:14.88, start: 0.000000, bitrate: N/A
  
      Stream #1.0: Video: 0x0000, 1k tbr, 1k tbn, 1k tbc
  
      Stream #1.1: Audio: nellymoser, 8000 Hz, mono, s16
  
  picture size invalid (0x0)
  
  Cannot allocate temp picture, check pix fmt