Class: Abrizer::FfprobeInformer

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(filename) ⇒ FfprobeInformer

Returns a new instance of FfprobeInformer.



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# File 'lib/abrizer/ffprobe_informer.rb', line 4

def initialize(filename)
  @filename = filename
  get_info
end

Instance Attribute Details

#info ⇒ Object (readonly)

Returns the value of attribute info.



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# File 'lib/abrizer/ffprobe_informer.rb', line 3

def info
  @info
end

#json_result ⇒ Object (readonly)

Returns the value of attribute json_result.



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# File 'lib/abrizer/ffprobe_informer.rb', line 3

def json_result
  @json_result
end

Instance Method Details

#audio_stream ⇒ Object 



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# File 'lib/abrizer/ffprobe_informer.rb', line 57

def audio_stream
  @info['streams'].find do |stream|
    stream['codec_type'] == 'audio'
  end
end

#calculate_aspect_ratio_from_wh ⇒ Object 



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# File 'lib/abrizer/ffprobe_informer.rb', line 36

def calculate_aspect_ratio_from_wh
  new_width = width
  new_height = height
  w = width
  h = height
  while h != 0
    rem = w % h
    w = h
    h = rem
  end
  new_height = new_height / w
  new_width = new_width / w
  "#{new_width}:#{new_height}"
end

#display_aspect_ratio ⇒ Object

dar



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# File 'lib/abrizer/ffprobe_informer.rb', line 26

def display_aspect_ratio #dar
  dar = video_stream['display_aspect_ratio']
  sar = video_stream['sample_aspect_ratio']
  if dar == "0:1" #&& sar == "0:1"
    calculate_aspect_ratio_from_wh
  else
    dar
  end
end

#duration ⇒ Object 



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# File 'lib/abrizer/ffprobe_informer.rb', line 22

def duration
  video_stream['duration'] if video_stream
end

#ffmpeg_info_cmd ⇒ Object 



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# File 'lib/abrizer/ffprobe_informer.rb', line 63

def ffmpeg_info_cmd
  "ffprobe -v error -print_format json -show_format -show_streams #{@filename}"
end

#get_info ⇒ Object 



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# File 'lib/abrizer/ffprobe_informer.rb', line 9

def get_info
  @json_result = `#{ffmpeg_info_cmd}`
  @info = MultiJson.load @json_result
end

#height ⇒ Object 



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# File 'lib/abrizer/ffprobe_informer.rb', line 18

def height
  video_stream['height'] if video_stream
end

#to_s ⇒ Object 



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# File 'lib/abrizer/ffprobe_informer.rb', line 67

def to_s
  ffmpeg_info_cmd + "\n" +
  "#{width}x#{height} DAR:#{display_aspect_ratio}"
end

#video_stream ⇒ Object 



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# File 'lib/abrizer/ffprobe_informer.rb', line 51

def video_stream
  @info['streams'].find do |stream|
    stream['codec_type'] == 'video'
  end
end

#width ⇒ Object 



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# File 'lib/abrizer/ffprobe_informer.rb', line 14

def width
  video_stream['width'] if video_stream
end