seba-vid-extend.rb

#!/usr/bin/env ruby
require 'tmpdir'
require 'fileutils'

fix_file = ARGV[0]
vid_file = ARGV[1]
out_file = ARGV[2]

FIXATION_FRAMES=10
VID_FRAMES=25
LAST_FRAME_REPS=25

frame_counter = 1

Dir.mktmpdir do |tmp_dir|
    `ffmpeg -i #{vid_file} -vf "scale=960:720" -r #{VID_FRAMES} -vframes #{VID_FRAMES} #{tmp_dir}/frame_%3d.jpg`
    new_dir = "#{tmp_dir}/new"
    Dir.mkdir(new_dir)

    (1..FIXATION_FRAMES).each do
        FileUtils.cp(fix_file, "#{new_dir}/frame_%03d.jpg" % frame_counter)
        frame_counter += 1
    end

    (1..VID_FRAMES).each do |i|
        FileUtils.cp(("#{tmp_dir}/frame_%03d.jpg" % i), ("#{new_dir}/frame_%03d.jpg" % frame_counter))
        frame_counter += 1
    end
    (1..LAST_FRAME_REPS).each do
        FileUtils.cp(("#{tmp_dir}/frame_%03d.jpg" % VID_FRAMES), ("#{new_dir}/frame_%03d.jpg" % frame_counter))
        frame_counter += 1
    end

    puts Dir.glob("#{new_dir}/*")

    `ffmpeg -i #{new_dir}/frame_%3d.jpg -vcodec mpeg4 #{out_file}`
end