Class: FFMPEG::Movie

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ Movie

Returns a new instance of Movie.

Raises:

  • (Errno::ENOENT) 


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# File 'lib/ffmpeg/movie.rb', line 7

def initialize(path)
  raise Errno::ENOENT, "the file '#{path}' does not exist" unless File.exists?(path)
  
  @path = escape(path)

  stdin, stdout, stderr = Open3.popen3("#{FFMPEG.ffmpeg_binary} -i '#{path}'") # Output will land in stderr
  output = stderr.read
  
  fix_encoding(output)
  
  output[/Duration: (\d{2}):(\d{2}):(\d{2}\.\d{2})/]
  @duration = ($1.to_i*60*60) + ($2.to_i*60) + $3.to_f
  
  output[/start: (\d*\.\d*)/]
  @time = $1 ? $1.to_f : 0.0
  
  output[/bitrate: (\d*)/]
  @bitrate = $1 ? $1.to_i : nil
  
  output[/Video: (.*)/]
  @video_stream = $1
  
  output[/Audio: (.*)/]
  @audio_stream = $1
  
  @uncertain_duration = true #output.include?("Estimating duration from bitrate, this may be inaccurate") || @time > 0
   
  if video_stream
    @video_codec, @colorspace, resolution, video_bitrate = video_stream.split(/\s?,\s?/)
    @video_bitrate = video_bitrate =~ %r(\A(\d+) kb/s\Z) ? $1.to_i : nil
    @resolution = resolution.split(" ").first rescue nil # get rid of [PAR 1:1 DAR 16:9]
    @dar = $1 if video_stream[/DAR (\d+:\d+)/]
  end
  
  if audio_stream
    @audio_codec, audio_sample_rate, @audio_channels, unused, audio_bitrate = audio_stream.split(/\s?,\s?/)
    @audio_bitrate = audio_bitrate =~ %r(\A(\d+) kb/s\Z) ? $1.to_i : nil
    @audio_sample_rate = audio_sample_rate[/\d*/].to_i
  end
  
  @invalid = true if @video_stream.to_s.empty? && @audio_stream.to_s.empty?
  @invalid = true if output.include?("is not supported")
end

Instance Attribute Details

#audio_bitrate ⇒ Object (readonly)

Returns the value of attribute audio_bitrate.



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# File 'lib/ffmpeg/movie.rb', line 5

def audio_bitrate
  @audio_bitrate
end

#audio_codec ⇒ Object (readonly)

Returns the value of attribute audio_codec.



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# File 'lib/ffmpeg/movie.rb', line 5

def audio_codec
  @audio_codec
end

#audio_sample_rate ⇒ Object (readonly)

Returns the value of attribute audio_sample_rate.



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# File 'lib/ffmpeg/movie.rb', line 5

def audio_sample_rate
  @audio_sample_rate
end

#audio_stream ⇒ Object (readonly)

Returns the value of attribute audio_stream.



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# File 'lib/ffmpeg/movie.rb', line 5

def audio_stream
  @audio_stream
end

#bitrate ⇒ Object (readonly)

Returns the value of attribute bitrate.



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# File 'lib/ffmpeg/movie.rb', line 3

def bitrate
  @bitrate
end

#colorspace ⇒ Object (readonly)

Returns the value of attribute colorspace.



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# File 'lib/ffmpeg/movie.rb', line 4

def colorspace
  @colorspace
end

#dar ⇒ Object (readonly)

Returns the value of attribute dar.



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# File 'lib/ffmpeg/movie.rb', line 4

def dar
  @dar
end

#duration ⇒ Object (readonly)

Returns the value of attribute duration.



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# File 'lib/ffmpeg/movie.rb', line 3

def duration
  @duration
end

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/ffmpeg/movie.rb', line 3

def path
  @path
end

#resolution ⇒ Object (readonly)

Returns the value of attribute resolution.



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# File 'lib/ffmpeg/movie.rb', line 4

def resolution
  @resolution
end

#time ⇒ Object (readonly)

Returns the value of attribute time.



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# File 'lib/ffmpeg/movie.rb', line 3

def time
  @time
end

#video_bitrate ⇒ Object (readonly)

Returns the value of attribute video_bitrate.



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# File 'lib/ffmpeg/movie.rb', line 4

def video_bitrate
  @video_bitrate
end

#video_codec ⇒ Object (readonly)

Returns the value of attribute video_codec.



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# File 'lib/ffmpeg/movie.rb', line 4

def video_codec
  @video_codec
end

#video_stream ⇒ Object (readonly)

Returns the value of attribute video_stream.



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# File 'lib/ffmpeg/movie.rb', line 4

def video_stream
  @video_stream
end

Instance Method Details

#audio_channels ⇒ Object 



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# File 'lib/ffmpeg/movie.rb', line 81

def audio_channels
  return nil unless @audio_channels
  return @audio_channels[/\d*/].to_i if @audio_channels["channels"]
  return 1 if @audio_channels["mono"]
  return 2 if @audio_channels["stereo"]
  return 6 if @audio_channels["5.1"]
end

#calculated_aspect_ratio ⇒ Object 



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# File 'lib/ffmpeg/movie.rb', line 67

def calculated_aspect_ratio
  if dar
    w, h = dar.split(":")
    w.to_f / h.to_f
  else
    aspect = width.to_f / height.to_f
    aspect.nan? ? nil : aspect
  end
end

#frame_rate ⇒ Object 



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# File 'lib/ffmpeg/movie.rb', line 89

def frame_rate
  video_stream[/(\d*\.?\d*)\s?fps/] ? $1.to_f : nil
end

#height ⇒ Object 



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# File 'lib/ffmpeg/movie.rb', line 63

def height
  resolution.split("x")[1].to_i rescue nil
end

#size ⇒ Object 



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# File 'lib/ffmpeg/movie.rb', line 77

def size
  File.size(@path)
end

#transcode(output_file, options = EncodingOptions.new, transcoder_options = {}, &block) ⇒ Object 



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# File 'lib/ffmpeg/movie.rb', line 93

def transcode(output_file, options = EncodingOptions.new, transcoder_options = {}, &block)
  Transcoder.new(self, output_file, options, transcoder_options).run &block
end

#uncertain_duration? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ffmpeg/movie.rb', line 55

def uncertain_duration?
  @uncertain_duration
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ffmpeg/movie.rb', line 51

def valid?
  not @invalid
end

#width ⇒ Object 



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# File 'lib/ffmpeg/movie.rb', line 59

def width
  resolution.split("x")[0].to_i rescue nil
end