movie -> gif89a

gif-it.rb

#!/usr/bin/ruby
# gif-it

if ARGV.length < 3
  puts "usage: gif-it <filename> <start-time> <duration>"
end

fn = ARGV.shift
start_time = ARGV.shift
duration = ARGV.shift
basename = File.basename(fn)
outputfn = "%s.gif" % basename

cmd = "ffmpeg -i \"%s\" -pix_fmt rgb24 -s cif -loop_output 0 -ss %s -t %s -r 6 -y \"%s\""
args = [fn, start_time, duration, basename]
cmd_w_args = cmd % args
puts cmd_w_args
`#{cmd_w_args}`
convert_cmd = "convert -depth 8 %s %s" % [outputfn, outputfn]
puts convert_cmd
`#{convert_cmd}`