added ruby script for concat videos

record-and-playback/scripts/README.txt

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+README file
+
+Scripts Description:
+
+===============================================================
+concat-videos.rb
+
+The script can create a image video of T seconds taking the logo.jpg file, and can join several videos.
+Receives N parameters which can be a video filename and/or integer T. Usage:
+
+ruby concat-videos.rb video1.flv 25 video2.flv
+output: a result.flv video (video1.flv+imageVideo.flv+video2.flv)
+
+ruby concat-videos.rb video1.flv 25 video2.flv 60 video3.flv
+output: a result.flv video (video1.flv+imageVideo.flv+video2.flv+imageVideo.flv+video3.flv)
+
+NOTE: The videos to join should be in the same directory
+===============================================================

record-and-playback/scripts/concat-videos.rb

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+class MediaFormatException < StandardError
+end
+
+class String
+	def is_i?
+		!!(self =~ /^[-+]?[0-9]+$/)
+	end
+end
+
+def executeFfmpeg(command)
+	IO.popen(command) do |pipe|
+		pipe.each("r") do |line|
+			puts line
+		end
+	end
+	raise MediaFormatException if $?.exitstatus != 0
+end
+
+def executeMencoder(videos)
+	command="mencoder -forceidx -of lavf -oac copy -ovc copy -o result.flv "
+	videos.each do|a|
+		command << "#{a} "
+	end
+	IO.popen(command) do |pipe|
+		pipe.each("r") do |line|
+			puts line
+		end
+	end
+	raise MediaFormatException if $?.exitstatus != 0
+end
+
+def execute(args)
+	videos = []
+	cont=0
+	args.each do|a|
+		if(a.include? ".flv")
+			puts "parsing flv video: #{a}..."
+			executeFfmpeg("ffmpeg -i #{a} -r 1 -y #{a}")
+			videos << a
+		elsif(a.is_i?)
+			puts "creating image video with duration: #{a} seconds..."
+			newImageVideo="tmp#{cont}.flv"
+			executeFfmpeg("ffmpeg -loop_input -t #{a} -i logo.jpg -r 1 #{newImageVideo}")
+			videos << newImageVideo
+			cont=cont+1
+		end
+	end
+	executeMencoder(videos)
+end
+
+execute(ARGV)