How to upload mp3 with custom duration/length

Does anyone know the right approach to change the duration/length of
an uploaded mp3 file? User has the option to upload mp3 file as full,
30 secs or 90 secs. So far, I have gotten it to work for full.

Do I have to use a processor (with ffmpeg) for this? Or is there a
built-in option in paperclip for this to happen?

Tried googling around to no avail…

By the way, if user selects 90 secs (for example), then I need
Paperclip not to upload the original. The same goes for 30 secs. In
theory, its one file or the other.

Your suggestions / feedback are welcome

Note that I am using Paperclip for all my uploads …

On Oct 2, 9:07 pm, Christian F. [email protected]

This is what I have. When i submit the form, the page just hangs. No
errors, no nothing.

model:
has_attached_file :media,
:styles => { :short => ‘k128’ },
:url => ‘/assets/:id/:style.:extension’,
:path => ‘:rails_root/public/
assets/:id/:style.:extension’,
:processors => [:process_audio]


module Paperclip
class ProcessAudio < Processor

attr_accessor :resolution, :whiny

def initialize(file, options = {}, attachment = nil)
  super
  @file = file
  @whiny = options[:whiny].nil? ? true : options[:whiny]
  @basename = File.basename(@file.path, File.extname(@file.path))
end

def make
  dst = Tempfile.new([ @basename, 'mp3' ].compact.join("."))
  dst.binmode

  cmd = "ffmpeg -i #{@file.path} -t 30 -acodec copy

#{File.expand_path(dst.path)}"

  begin
    success = Paperclip.run(cmd, [ 0, 1 ])
  rescue PaperclipCommandLineError
    raise PaperclipError, "There was an error processing the

preview for #{@basename}" if whiny
end
dst
end
end
end

On Oct 2, 9:08 pm, Christian F. [email protected]

I got mine to work with the following code, incase future devs stumble
across a similar situation:

module Paperclip
class ProcessAudio < Processor

attr_accessor :geometry, :whiny

def initialize(file, options = {}, attachment = nil)
  super
  @file = file

  unless options[:geometry].nil?
    if options[:geometry] == 'full'
      @geometry = ''
    elsif options[:geometry] == '30'
      @geometry = '-t 30'
    elsif options[:geometry] == '90'
      @geometry = '-t 90'
    end
  end

  @whiny = options[:whiny].nil? ? true : options[:whiny]
  @basename = File.basename(@file.path, File.extname(@file.path))
end

def make
  dst = Tempfile.new([ @basename, 'mp3' ].compact.join("."))
  dst.binmode

  cmd = "ffmpeg -i #{@file.path} #{@geometry} -acodec copy -y

#{File.expand_path(dst.path)}"

  begin
    success = Paperclip.run(cmd)
  rescue PaperclipCommandLineError
    raise PaperclipError, "There was an error processing the

preview for #{@basename}" if whiny
end
dst
end
end
end

Checkout
http://blog.ncodedevlabs.com/2010/01/14/extracting-audio-length-using-rails/

On Oct 2, 1:39 pm, Christian F. [email protected]

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