Class: FFmpegWeb::Transcoder

Inherits:
Object
  • Object
show all
Defined in:
lib/ffmpeg_web.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input, output) ⇒ Transcoder

Returns a new instance of Transcoder.



7
8
9
10
11
12
13
14
15
16
17
 
# File 'lib/ffmpeg_web.rb', line 7

def initialize(input, output)
  @input = input
  @output = output
  
  raise "Input file does not exist" if !File.exists?(input)
  raise "Output directory does not exist" if !File.exists?(File.dirname(output))

  @video_info = ffmpeg_info

  raise "File is not a valid movie file" if !is_valid?
end

Instance Attribute Details

#input ⇒ Object

Returns the value of attribute input.



5
6
7
 
# File 'lib/ffmpeg_web.rb', line 5

def input
  @input
end

#output ⇒ Object

Returns the value of attribute output.



5
6
7
 
# File 'lib/ffmpeg_web.rb', line 5

def output
  @output
end

#video_info ⇒ Object

Returns the value of attribute video_info.



5
6
7
 
# File 'lib/ffmpeg_web.rb', line 5

def video_info
  @video_info
end

Instance Method Details

#duration ⇒ Object

returns the duration of the video in seconds



20
21
22
23
 
# File 'lib/ffmpeg_web.rb', line 20

def duration
  duration = /Duration: (\d{2}):(\d{2}):(\d{2}).(\d{2})/.match(@video_info)
  duration_in_milliseconds = ($~[1].to_i * 60 * 60) + ($~[2].to_i * 60) + $~[3].to_i + ($~[4].to_i / 1000)
end

#transcode(output_size = nil) ⇒ Object

transcodes the file and returns an io pipe object



26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
 
# File 'lib/ffmpeg_web.rb', line 26

def transcode(output_size=nil)
  progress_read, progress_write = IO::pipe
  pid = Process.fork do
    progress_read.close

    if output_size.nil?
     crf_encode(progress_write)
    else
      two_pass_encode(output_size, progress_write)
    end
  end

  progress_write.close

  progress_read
end