Module: Video2gif::FFmpeg::Subtitles::ClassMethods

Defined in:
lib/video2gif/ffmpeg/subtitles.rb

Instance Method Summary collapse

Instance Method Details

#bitmap_subtitles_scale_overlay(options) ⇒ Object 



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# File 'lib/video2gif/ffmpeg/subtitles.rb', line 77

def bitmap_subtitles_scale_overlay(options)
  if has_bitmap_subtitles(options)
    [
      subtitles_scale(options),
      subtitles_overlay
    ]
  end
end

#has_bitmap_subtitles(options) ⇒ Object 



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# File 'lib/video2gif/ffmpeg/subtitles.rb', line 54

def has_bitmap_subtitles(options)
  has_subtitles(options) && KNOWN_BITMAP_FORMATS.include?(subtitle_info(options)[:codec_name])
end

#has_subtitles(options) ⇒ Object 



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# File 'lib/video2gif/ffmpeg/subtitles.rb', line 43

def has_subtitles(options)
  options[:subtitles] && options[:probe_infos][:streams].any? { |s| s[:codec_type] == 'subtitle' }
end

#has_text_subtitles(options) ⇒ Object 



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# File 'lib/video2gif/ffmpeg/subtitles.rb', line 58

def has_text_subtitles(options)
  has_subtitles(options) && KNOWN_TEXT_FORMATS.include?(subtitle_info(options)[:codec_name])
end

#subtitle_info(options) ⇒ Object 



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# File 'lib/video2gif/ffmpeg/subtitles.rb', line 47

def subtitle_info(options)
  if has_subtitles(options)
    options[:probe_infos][:streams].find_all { |s| s[:codec_type] == 'subtitle' }
                                   .fetch(options[:subtitle_index], nil)
  end
end

#subtitles_overlay ⇒ Object 



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# File 'lib/video2gif/ffmpeg/subtitles.rb', line 73

def subtitles_overlay
  '[0:v][subs]overlay=format=auto'
end

#subtitles_scale(options) ⇒ Object 



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# File 'lib/video2gif/ffmpeg/subtitles.rb', line 62

def subtitles_scale(options)
  scale_parameters = []

  scale_parameters << 'flags=lanczos'
  scale_parameters << 'sws_dither=none'
  scale_parameters << "width=#{video_info(options)[:width]}"
  scale_parameters << "height=#{video_info(options)[:height]}"

  "[0:s:#{options[:subtitle_index]}]scale=#{scale_parameters.join(':')}[subs]"
end

#text_subtitles(options) ⇒ Object 



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# File 'lib/video2gif/ffmpeg/subtitles.rb', line 86

def text_subtitles(options)
  if has_text_subtitles(options)
    %W[
      setpts=PTS+#{Utils.duration_to_seconds(options[:seek])}/TB
      subtitles='#{options[:input_filename]}':si=#{options[:subtitle_index]}
      setpts=PTS-STARTPTS
    ]
  end
end