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• How to change metadata with ffmpeg/avconv without creating a new file ?

  16 mars, par Stephan Kulla

  I am writing a python script for producing audio and video podcasts. There are a bunch of recorded media files (audio and video) and text files containing the meta information.

  



  Now I want to program a function which shall add the information from the meta data text files to all media files (the original and the converted ones). Because I have to handle many different file formats (wav, flac, mp3, mp4, ogg, ogv...) it would be great to have a tool which add meta data to arbitrary formats.

  



  My Question :

  



  How can I change the metadata of a file with ffmpeg/avconv without changing the audio or video of it and without creating a new file ? Is there another commandline/python tool which would do the job for me ?

  



  What I tried so far :

  



  I thought ffmpeg/avconv could be such a tool, because it can handle nearly all media formats. I hoped, that if I set -i input_file and the output_file to the same file, ffmpeg/avconv will be smart enough to leave the file unchanged. Then I could set -metadata key=value and just the metadata will be changed.

  



  But I noticed, that if I type avconv -i test.mp3 -metadata title='Test title' test.mp3 the audio test.mp3 will be reconverted in another bitrate.

  



  So I thought to use -c copy to copy all video and audio information. Unfortunately also this does not work :

  



  :~$ du -h test.wav # test.wav is 303 MB big
303M    test.wav

:~$ avconv -i test.wav -c copy -metadata title='Test title' test.wav
avconv version 0.8.3-4:0.8.3-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the
Libav    developers
built on Jun 12 2012 16:37:58 with gcc 4.6.3
[wav @ 0x846b260] max_analyze_duration reached
Input #0, wav, from 'test.wav':
Duration: 00:29:58.74, bitrate: 1411 kb/s
    Stream #0.0: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
File 'test.wav' already exists. Overwrite ? [y/N] y
Output #0, wav, to 'test.wav':
Metadata:
    title           : Test title
    encoder         : Lavf53.21.0
    Stream #0.0: Audio: pcm_s16le, 44100 Hz, 2 channels, 1411 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press ctrl-c to stop encoding
size=     896kB time=5.20 bitrate=1411.3kbits/s    
video:0kB audio:896kB global headers:0kB muxing overhead 0.005014%

:~$ du -h test.wav # file size of test.wav changed dramatically
900K    test.wav


  



  You see, that I cannot use -c copy if input_file and output_file are the same. Of course I could produce a temporarily file :

  



  :-$ avconv -i test.wav -c copy -metadata title='Test title' test_temp.mp3
:-$ mv test_tmp.mp3 test.mp3


  



  But this solution would create (temporarily) a new file on the filesystem and is therefore not preferable.

  


• Looking for a Sales Development Representative (Jobs at Piwik)

  20 mai 2015, par Piwik Core Team — Jobs

  This blog post is a job offer at Piwik PRO for a Sales Development Representative. Please share this job ad if you know anyone who may be interested.

  Job description

  As a sales development rep your job will be to work with our sales team to identify and nurture sales opportunities. You will be one of the initial building blocks of our US operation, especially as we begin to scale it, so there will be plenty of opportunities for advancement within the company.

  Responsibilities

  • Generate new sales opportunities
  • Help to develop and improve sales strategies
  • Set up discussions with senior executives and evaluate their business needs
  • Manage and nurture a pipeline of prospects until a given stage
  • Use marketing & sales CRM tools

  Requirements

  • Desire to learn and succeed in sales
  • 1+ years of related experience
  • Advanced research skills
  • Ability to write professional emails
  • Native English proficiency with excellent verbal communication skills
  • Passion for technology

  Compensation

  Salary (full-time) + performance-based incentives

  Location

  Remote

  About Piwik PRO

  At Piwik and Piwik PRO we develop the leading open source web analytics platform, used by over 1.1M websites worldwide and is currently ranked the 7th most used web analytics tool in the world. Our vision is to build the best open alternative to Google Universal Analytics.

  The Piwik platform collects, stores and processes a lot of information : hundreds of millions of data points each month. We create intuitive, simple and beautiful reports that delight our users.

  Apply online

  To apply for this position, please Apply online here. We look forward to receiving your applications !

• Looking for a Sales Development Representative (Jobs at Piwik)

  20 mai 2015, par Piwik Core Team — Jobs

  This blog post is a job offer at Piwik PRO for a Sales Development Representative. Please share this job ad if you know anyone who may be interested.

  Job description

  As a sales development rep your job will be to work with our sales team to identify and nurture sales opportunities. You will be one of the initial building blocks of our US operation, especially as we begin to scale it, so there will be plenty of opportunities for advancement within the company.

  Responsibilities

  • Generate new sales opportunities
  • Help to develop and improve sales strategies
  • Set up discussions with senior executives and evaluate their business needs
  • Manage and nurture a pipeline of prospects until a given stage
  • Use marketing & sales CRM tools

  Requirements

  • Desire to learn and succeed in sales
  • 1+ years of related experience
  • Advanced research skills
  • Ability to write professional emails
  • Native English proficiency with excellent verbal communication skills
  • Passion for technology

  Compensation

  Salary (full-time) + performance-based incentives

  Location

  Remote

  About Piwik PRO

  At Piwik and Piwik PRO we develop the leading open source web analytics platform, used by over 1.1M websites worldwide and is currently ranked the 7th most used web analytics tool in the world. Our vision is to build the best open alternative to Google Universal Analytics.

  The Piwik platform collects, stores and processes a lot of information : hundreds of millions of data points each month. We create intuitive, simple and beautiful reports that delight our users.

  Apply online

  To apply for this position, please Apply online here. We look forward to receiving your applications !