Video Converter for the html5 Video Player Projekktor
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# This file is under GPL
# Do whatever you like
# written by Daniel Schubert 2014
# <mail@schubertdaniel.de>
class VideoConversion
# - converts any (hopefully) video into different other vids, f.e. three vids suitable for projekktor
# - needs ffmpeg and ffmpeg2theora
# vidfile string video file name
# video_br int (video bitrate in k )
# audio_br int (audio bitrate in k)
# aufio_q int (ogv audio quality between 1 and 10)
# video_q int (ogv video quality between 1 and 10)
# target string determines the output -> 'mpeg' - simple mpg , 'projekktor' - for projekktor
def initialize(vidfile, width=640, height=360, target="mpg",video_br=600, audio_br=128, audio_q=5,video_q=7, freq = 48000)
@videofile = vidfile#.dump
#target size
@width = width
@height= height
@target= target
#for webm and mp4 files
@video_br = video_br
@audio_br = audio_br
#for ogv video
@audio_q = audio_q
@video_q = video_q
@freq = freq
@temp_file = "temp-vid.mpg"
@aspect= nil
end
#
def get_aspect
# uses the output from ffprobe to calculate the aspect ratio from input video
w , h = nil
f = IO.popen("ffprobe -show_streams \"#{@videofile}\"")
vidinfo = f.readlines
f.close
#
unless vidinfo.empty?
vidinfo.each do |elem|
if elem =~ /display_aspect_ratio=\d+:\d+/
b = elem.scan(/\d*:\d*/)[0].split(":")
@aspect = b[0].to_f/b[1].to_f
else
if elem =~ /width=\d+/
w = elem.to_s.gsub!("width=", "").chomp.scan(/\d+/)
elsif elem =~ /height=\d+/
h = elem.to_s.gsub!("height=", "").chomp.scan(/\d+/)
end
end
end
if @aspect == nil
@aspect = w.join.to_f / h.join.to_f
end
end
return @aspect
end
#
def get_basename
bn = File.basename(@videofile, ".*")
return bn
end
def converter
Dir.mkdir('converted') unless File.exists?('converted')
File.delete(@temp_file) if File::exists?(@temp_file)
#
target_aspect = (@width.to_f / @height.to_f)
#
begin
videobasename = get_basename
puts videobasename
#
if get_aspect > target_aspect # balken oben und unten
neue_hoehe = (@width/get_aspect).to_i
balken = (@height - neue_hoehe) / 2
# if padding applied older versions of ffmpeg need the "-padleft XX -padright XX " syntax
padding = "-vf \"pad=#{@width}:#{@height}:0:#{balken}\""
@height = neue_hoehe
elsif get_aspect < target_aspect # balken an die seite
neue_breite = (@height * get_aspect).to_i
balken = (@width - neue_breite) / 2
# if padding applied older versions of ffmpeg need the "-padleft XX -padright XX " syntax
padding = "-vf \"pad=#{@width}:#{@height}:#{balken}:0\""
@width = neue_breite
else #aspect unchanged -> no padding
padding = ""
end
#
case @target
when "mpg" # simple mpeg
#simple mpg
`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\"`
when "projekktor" #Projekktor
#temp video necessary for correct padding when converting to more formats
`ffmpeg -i \"#{@videofile}\" -s #{@width}x#{@height} #{padding} -aspect #{target_aspect} -b 5000k -ar 44100 -ab 320k #{@temp_file}`
#conversions for projekktor
`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\"`
`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\"`
`ffmpeg2theora #{@temp_file} -v #{@video_q} -a #{@audio_q} -o converted/\"#{videobasename}.ogv\"`
File.delete(@temp_file)
when "youtube"
puts "YouTube not implemented yet!"
exit
else
puts "Nothing valid chosen-- bye bye"
exit
end
rescue => e
puts "Something went terribly wrong: ", e
end
end
#
end