Class: FFMPEG::Movie

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

Constant Summary collapse

UNSUPPORTED_CODEC_PATTERN = 
/^Unsupported codec with id (\d+) for input stream (\d+)$/

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ Movie 



15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
 
# File 'lib/ffmpeg/movie.rb', line 15

def initialize(path)
  @path = path

  if remote?
    @head = head
    raise Errno::ENOENT, "the URL '#{path}' does not exist" unless @head.is_a?(Net::HTTPSuccess)
  else
    raise Errno::ENOENT, "the file '#{path}' does not exist" unless File.exist?(path)
  end

  @path = path

  # ffmpeg will output to stderr
  command = [FFMPEG.ffprobe_binary, '-i', path, *%w(-print_format json -show_format -show_streams -show_error)]
  std_output = ''
  std_error = ''

  Open3.popen3(*command) do |stdin, stdout, stderr|
    std_output = stdout.read unless stdout.nil?
    std_error = stderr.read unless stderr.nil?
  end

  fix_encoding(std_output)
  fix_encoding(std_error)

  begin
    @metadata = MultiJson.load(std_output, symbolize_keys: true)
  rescue MultiJson::ParseError
    raise "Could not parse output from FFProbe:\n#{ std_output }"
  end

  if @metadata.key?(:error)

    @duration = 0

  else
    video_streams = @metadata[:streams].select { |stream| stream.key?(:codec_type) and stream[:codec_type] === 'video' }
    audio_streams = @metadata[:streams].select { |stream| stream.key?(:codec_type) and stream[:codec_type] === 'audio' }

    @container = @metadata[:format][:format_name]

    @duration = @metadata[:format][:duration].to_f

    @time = @metadata[:format][:start_time].to_f

    @format_tags = @metadata[:format][:tags]

    @creation_time = if @format_tags and @format_tags.key?(:creation_time)
                       begin
                         Time.parse(@format_tags[:creation_time])
                       rescue ArgumentError
                         nil
                       end
                     else
                       nil
                     end

    @bitrate = @metadata[:format][:bit_rate].to_i

    # TODO: Handle multiple video codecs (is that possible?)
    video_stream = video_streams.first
    unless video_stream.nil?
      @video_codec = video_stream[:codec_name]
      @colorspace = video_stream[:pix_fmt]
      @width = video_stream[:width]
      @height = video_stream[:height]
      @video_bitrate = video_stream[:bit_rate].to_i
      @sar = video_stream[:sample_aspect_ratio]
      @dar = video_stream[:display_aspect_ratio]

      @frame_rate = unless video_stream[:avg_frame_rate] == '0/0'
                      Rational(video_stream[:avg_frame_rate])
                    else
                      nil
                    end

      @video_stream = "#{video_stream[:codec_name]} (#{video_stream[:profile]}) (#{video_stream[:codec_tag_string]} / #{video_stream[:codec_tag]}), #{colorspace}, #{resolution} [SAR #{sar} DAR #{dar}]"

      @rotation = if video_stream.key?(:tags) and video_stream[:tags].key?(:rotate)
                    video_stream[:tags][:rotate].to_i
                  else
                    nil
                  end
    end

    @audio_streams = audio_streams.map do |stream|
      {
        :index => stream[:index],
        :channels => stream[:channels].to_i,
        :codec_name => stream[:codec_name],
        :sample_rate => stream[:sample_rate].to_i,
        :bitrate => stream[:bit_rate].to_i,
        :channel_layout => stream[:channel_layout],
        :tags => stream[:streams],
        :sample_fmt => stream[:sample_fmt],
        :overview => "#{stream[:codec_name]} (#{stream[:codec_tag_string]} / #{stream[:codec_tag]}), #{stream[:sample_rate]} Hz, #{stream[:channel_layout]}, #{stream[:sample_fmt]}, #{stream[:bit_rate]} bit/s"
      }
    end

    audio_stream = @audio_streams.first
    unless audio_stream.nil?
      @audio_channels = audio_stream[:channels]
      @audio_codec = audio_stream[:codec_name]
      @audio_sample_rate = audio_stream[:sample_rate]
      @audio_bitrate = audio_stream[:bitrate]
      @audio_channel_layout = audio_stream[:channel_layout]
      @audio_tags = audio_stream[:audio_tags]
      @audio_sample_fmt = audio_stream[:sample_fmt]
      @audio_stream = audio_stream[:overview]
    end

  end

  unsupported_stream_ids = unsupported_streams(std_error)
  nil_or_unsupported = -> (stream) { stream.nil? || unsupported_stream_ids.include?(stream[:index]) }

  @invalid = true if nil_or_unsupported.(video_stream) && nil_or_unsupported.(audio_stream)
  @invalid = true if @metadata.key?(:error)
  @invalid = true if std_error.include?("could not find codec parameters")
end

Instance Attribute Details

#audio_bitrate ⇒ Object (readonly)

Returns the value of attribute audio_bitrate.



9
10
11
 
# File 'lib/ffmpeg/movie.rb', line 9

def audio_bitrate
  @audio_bitrate
end

#audio_channels ⇒ Object (readonly)

Returns the value of attribute audio_channels.



9
10
11
 
# File 'lib/ffmpeg/movie.rb', line 9

def audio_channels
  @audio_channels
end

#audio_codec ⇒ Object (readonly)

Returns the value of attribute audio_codec.



9
10
11
 
# File 'lib/ffmpeg/movie.rb', line 9

def audio_codec
  @audio_codec
end

#audio_sample_fmt ⇒ Object (readonly)

Returns the value of attribute audio_sample_fmt.



9
10
11
 
# File 'lib/ffmpeg/movie.rb', line 9

def audio_sample_fmt
  @audio_sample_fmt
end

#audio_sample_rate ⇒ Object (readonly)

Returns the value of attribute audio_sample_rate.



9
10
11
 
# File 'lib/ffmpeg/movie.rb', line 9

def audio_sample_rate
  @audio_sample_rate
end

#audio_stream ⇒ Object (readonly)

Returns the value of attribute audio_stream.



9
10
11
 
# File 'lib/ffmpeg/movie.rb', line 9

def audio_stream
  @audio_stream
end

#audio_streams ⇒ Object (readonly)

Returns the value of attribute audio_streams.



9
10
11
 
# File 'lib/ffmpeg/movie.rb', line 9

def audio_streams
  @audio_streams
end

#audio_tags ⇒ Object (readonly)

Returns the value of attribute audio_tags.



9
10
11
 
# File 'lib/ffmpeg/movie.rb', line 9

def audio_tags
  @audio_tags
end

#bitrate ⇒ Object (readonly)

Returns the value of attribute bitrate.



7
8
9
 
# File 'lib/ffmpeg/movie.rb', line 7

def bitrate
  @bitrate
end

#colorspace ⇒ Object (readonly)

Returns the value of attribute colorspace.



8
9
10
 
# File 'lib/ffmpeg/movie.rb', line 8

def colorspace
  @colorspace
end

#container ⇒ Object (readonly)

Returns the value of attribute container.



10
11
12
 
# File 'lib/ffmpeg/movie.rb', line 10

def container
  @container
end

#creation_time ⇒ Object (readonly)

Returns the value of attribute creation_time.



7
8
9
 
# File 'lib/ffmpeg/movie.rb', line 7

def creation_time
  @creation_time
end

#dar ⇒ Object (readonly)

Returns the value of attribute dar.



8
9
10
 
# File 'lib/ffmpeg/movie.rb', line 8

def dar
  @dar
end

#duration ⇒ Object (readonly)

Returns the value of attribute duration.



7
8
9
 
# File 'lib/ffmpeg/movie.rb', line 7

def duration
  @duration
end

#format_tags ⇒ Object (readonly)

Returns the value of attribute format_tags.



11
12
13
 
# File 'lib/ffmpeg/movie.rb', line 11

def format_tags
  @format_tags
end

#frame_rate ⇒ Object (readonly)

Returns the value of attribute frame_rate.



8
9
10
 
# File 'lib/ffmpeg/movie.rb', line 8

def frame_rate
  @frame_rate
end

#height ⇒ Object (readonly)

Returns the value of attribute height.



8
9
10
 
# File 'lib/ffmpeg/movie.rb', line 8

def height
  @height
end

#metadata ⇒ Object (readonly)

Returns the value of attribute metadata.



11
12
13
 
# File 'lib/ffmpeg/movie.rb', line 11

def metadata
  @metadata
end

#path ⇒ Object (readonly)

Returns the value of attribute path.



7
8
9
 
# File 'lib/ffmpeg/movie.rb', line 7

def path
  @path
end

#rotation ⇒ Object (readonly)

Returns the value of attribute rotation.



7
8
9
 
# File 'lib/ffmpeg/movie.rb', line 7

def rotation
  @rotation
end

#sar ⇒ Object (readonly)

Returns the value of attribute sar.



8
9
10
 
# File 'lib/ffmpeg/movie.rb', line 8

def sar
  @sar
end

#time ⇒ Object (readonly)

Returns the value of attribute time.



7
8
9
 
# File 'lib/ffmpeg/movie.rb', line 7

def time
  @time
end

#video_bitrate ⇒ Object (readonly)

Returns the value of attribute video_bitrate.



8
9
10
 
# File 'lib/ffmpeg/movie.rb', line 8

def video_bitrate
  @video_bitrate
end

#video_codec ⇒ Object (readonly)

Returns the value of attribute video_codec.



8
9
10
 
# File 'lib/ffmpeg/movie.rb', line 8

def video_codec
  @video_codec
end

#video_stream ⇒ Object (readonly)

Returns the value of attribute video_stream.



8
9
10
 
# File 'lib/ffmpeg/movie.rb', line 8

def video_stream
  @video_stream
end

#width ⇒ Object (readonly)

Returns the value of attribute width.



8
9
10
 
# File 'lib/ffmpeg/movie.rb', line 8

def width
  @width
end

Instance Method Details

#audio_channel_layout ⇒ Object 



187
188
189
190
191
192
193
194
195
196
197
198
199
 
# File 'lib/ffmpeg/movie.rb', line 187

def audio_channel_layout
  # TODO Whenever support for ffmpeg/ffprobe 1.2.1 is dropped this is no longer needed
  @audio_channel_layout || case(audio_channels)
                             when 1
                               'stereo'
                             when 2
                               'stereo'
                             when 6
                               '5.1'
                             else
                               'unknown'
                           end
end

#calculated_aspect_ratio ⇒ Object 



171
172
173
 
# File 'lib/ffmpeg/movie.rb', line 171

def calculated_aspect_ratio
  aspect_from_dar || aspect_from_dimensions
end

#calculated_pixel_aspect_ratio ⇒ Object 



175
176
177
 
# File 'lib/ffmpeg/movie.rb', line 175

def calculated_pixel_aspect_ratio
  aspect_from_sar || 1
end

#local? ⇒ Boolean 



153
154
155
 
# File 'lib/ffmpeg/movie.rb', line 153

def local?
  not remote?
end

#remote? ⇒ Boolean 



149
150
151
 
# File 'lib/ffmpeg/movie.rb', line 149

def remote?
  @path =~ URI::regexp(%w(http https))
end

#resolution ⇒ Object 



165
166
167
168
169
 
# File 'lib/ffmpeg/movie.rb', line 165

def resolution
  unless width.nil? or height.nil?
    "#{width}x#{height}"
  end
end

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



205
206
207
 
# File 'lib/ffmpeg/movie.rb', line 205

def screenshot(output_file, options = EncodingOptions.new, transcoder_options = {}, &block)
  Transcoder.new(self, output_file, options.merge(screenshot: true), transcoder_options).run &block
end

#size ⇒ Object 



179
180
181
182
183
184
185
 
# File 'lib/ffmpeg/movie.rb', line 179

def size
  if local?
    File.size(@path)
  else
    @head.content_length
  end
end

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



201
202
203
 
# File 'lib/ffmpeg/movie.rb', line 201

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

#unsupported_streams(std_error) ⇒ Object 



136
137
138
139
140
141
142
143
 
# File 'lib/ffmpeg/movie.rb', line 136

def unsupported_streams(std_error)
  [].tap do |stream_indices|
    std_error.each_line do |line|
      match = line.match(UNSUPPORTED_CODEC_PATTERN)
      stream_indices << match[2].to_i if match
    end
  end
end

#valid? ⇒ Boolean 



145
146
147
 
# File 'lib/ffmpeg/movie.rb', line 145

def valid?
  not @invalid
end