How to read audiofile information with Rails, I want to read the total duration (in seconds) of an audio file

Question

As you can see in the Timeline.rb model is that I define Size by the source size, but I want to change that to the source duration of the audiofile.

Current setup

  def size
    (source.size.to_f/10000000).round(1)
  end

I tryed a lot gems and stuff but I doesn't seems to get it working? P.S. files are stored on S3 Amazon.

Any thoughts? Greetings, Chris

score 0 · Answer 1 · answered Aug 05 '16 at 18:31

0

You're going to have to use a library like taglib because neither Ruby nor Rails have any inbuilt support for audio.

In taglib, you'd do something like this:

require 'taglib'

  def size(file_reference)
    properties = file_reference.audio_properties
    return properties.length
  end

You'd also need to set up a method in your model to set file references (by opening audio files, but you can look that up yourself).

answered Aug 05 '16 at 18:31

MarsAtomic

That works great thanks! Only taglib isn't working on Heroku... I tryed many buildpacks but most of them are old and does not support ruby 2.3 any thoughts? – Chris Kroon Aug 06 '16 at 13:31
There's a taglib buildpack specificallly for [Heroku](https://github.com/mrrad/heroku-buildpack-taglib). Did you try it? This [SO question](http://stackoverflow.com/questions/16106552/constructing-custom-heroku-ruby-rails-buildpack-for-web-app-using-taglib-ruby) may also help. – MarsAtomic Aug 06 '16 at 14:58
Yeah I tryed all buildpacks I could find, I end up giving this up.. :) – Chris Kroon Aug 10 '16 at 21:58

1 Answers1