128 lines
4.4 KiB
Ruby
128 lines
4.4 KiB
Ruby
# This file is under GPL
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# Do whatever you like
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# written by Daniel Schubert 2014
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# <mail@schubertdaniel.de>
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class VideoConversion
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# - converts any (hopefully) video into different other vids, f.e. three vids suitable for projekktor
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# - needs ffmpeg and ffmpeg2theora
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# vidfile string video file name
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# video_br int (video bitrate in k )
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# audio_br int (audio bitrate in k)
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# aufio_q int (ogv audio quality between 1 and 10)
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# video_q int (ogv video quality between 1 and 10)
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# target string determines the output -> 'mpeg' - simple mpg , 'projekktor' - for projekktor
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def initialize(vidfile, width=640, height=360, target="mpg",video_br=600, audio_br=128, audio_q=5,video_q=7, freq = 48000)
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@videofile = vidfile#.dump
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#target size
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@width = width
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@height= height
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@target= target
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#for webm and mp4 files
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@video_br = video_br
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@audio_br = audio_br
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#for ogv video
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@audio_q = audio_q
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@video_q = video_q
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@freq = freq
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@temp_file = "temp-vid.mpg"
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@aspect= nil
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end
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#
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def get_aspect
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# uses the output from ffprobe to calculate the aspect ratio from input video
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w , h = nil
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f = IO.popen("ffprobe -show_streams \"#{@videofile}\"")
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vidinfo = f.readlines
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f.close
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#
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unless vidinfo.empty?
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vidinfo.each do |elem|
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if elem =~ /display_aspect_ratio=\d+:\d+/
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b = elem.scan(/\d*:\d*/)[0].split(":")
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@aspect = b[0].to_f/b[1].to_f
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else
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if elem =~ /width=\d+/
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w = elem.to_s.gsub!("width=", "").chomp.scan(/\d+/)
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elsif elem =~ /height=\d+/
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h = elem.to_s.gsub!("height=", "").chomp.scan(/\d+/)
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end
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end
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end
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if @aspect == nil
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@aspect = w.join.to_f / h.join.to_f
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end
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end
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return @aspect
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end
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#
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def get_basename
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bn = File.basename(@videofile, ".*")
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return bn
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end
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def converter
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Dir.mkdir('converted') unless File.exists?('converted')
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File.delete(@temp_file) if File::exists?(@temp_file)
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#
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target_aspect = (@width.to_f / @height.to_f)
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#
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begin
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videobasename = get_basename
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puts videobasename
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#
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if get_aspect > target_aspect # balken oben und unten
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neue_hoehe = (@width/get_aspect).to_i
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balken = (@height - neue_hoehe) / 2
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# if padding applied older versions of ffmpeg need the "-padleft XX -padright XX " syntax
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padding = "-vf \"pad=#{@width}:#{@height}:0:#{balken}\""
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@height = neue_hoehe
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elsif get_aspect < target_aspect # balken an die seite
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neue_breite = (@height * get_aspect).to_i
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balken = (@width - neue_breite) / 2
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# if padding applied older versions of ffmpeg need the "-padleft XX -padright XX " syntax
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padding = "-vf \"pad=#{@width}:#{@height}:#{balken}:0\""
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@width = neue_breite
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else #aspect unchanged -> no padding
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padding = ""
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end
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#
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case @target
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when "mpg" # simple mpeg
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#simple mpg
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`ffmpeg -i \"#{@videofile}\" -s #{@width}x#{@height} #{padding} -aspect #{target_aspect} -threads 2 -b #{@video_br}k -ab #{@audio_br}k -ar #{@freq} -metadata creation_time=\"#{Time.new}\" converted/\"#{videobasename}.mpg\"`
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when "projekktor" #Projekktor
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#temp video necessary for correct padding when converting to more formats
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`ffmpeg -i \"#{@videofile}\" -s #{@width}x#{@height} #{padding} -aspect #{target_aspect} -b 5000k -ar 44100 -ab 320k #{@temp_file}`
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#conversions for projekktor
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`ffmpeg -i #{@temp_file} -threads 2 -aspect #{target_aspect} -vcodec libx264 -b #{@video_br}k -vpre ipod640 -ab #{@audio_br}k -metadata creation_time=\"#{Time.new}\" converted/\"#{videobasename}.mp4\"`
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`ffmpeg -i #{@temp_file} -threads 2 -aspect #{target_aspect} -b #{@video_br}k -ab #{@audio_br}k -metadata creation_time=\"#{Time.new}\" converted/\"#{videobasename}.webm\"`
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`ffmpeg2theora #{@temp_file} -v #{@video_q} -a #{@audio_q} -o converted/\"#{videobasename}.ogv\"`
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File.delete(@temp_file)
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when "youtube"
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puts "YouTube not implemented yet!"
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exit
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else
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puts "Nothing valid chosen-- bye bye"
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exit
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end
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rescue => e
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puts "Something went terribly wrong: ", e
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end
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end
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#
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end
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