Slice & convert given video files to .webm format. WebM 짤방 제조용 스크립트.

2webm.rb

#!/usr/bin/env ruby
# coding: UTF-8

# 2webm.rb
# 
# convert given video file to .webm format
#
# (ffmpeg should be installed with libvpx and libvorbis.
#
# ex: $ brew install ffmpeg --with-libvpx --with-libvorbis)
# 
# created on : 2014.07.15.
# last update: 2022.08.11.
# 
# by [email protected]

require 'bundler/setup'

require 'thor'

module Ffmpeg
 
  VERBOSE = true

  class ToWebM < Thor
    default_task :convert

    desc "convert", "convert a video file to .webm format"
    long_desc <<CONVERT_DESC
* Usage

# will convert original.mp4 to original.mp4.webm

$ #{__FILE__} -i original.mp4


# will convert original.mp4 to converted.webm

$ #{__FILE__} -i original.mp4 -o converted.webm


# will convert original.mp4 into 320x240

$ #{__FILE__} -i original.mp4 -w 320 -h 240


# will slice & convert original.mp4 from 01:20:40.0 to 01:20:50.0 (for 10.0 seconds)

$ #{__FILE__} -i original.mp4 -s 01:20:40.0 -d 10.0
CONVERT_DESC
    method_option :in_filepath, type: :string, aliases: '-i', desc: 'input video file\'s path', required: true
    method_option :out_filepath, type: :string, aliases: '-o', desc: 'output video file\'s path'
    method_option :start, type: :string, aliases: '-s', desc: 'start point of input video'
    method_option :duration, type: :string, aliases: '-d', desc: 'length of input video'
    method_option :width, type: :numeric, aliases: '-w', desc: 'width of output video'
    method_option :height, type: :numeric, aliases: '-h', desc: 'height of output video'
    def convert
      # time
      start = options[:start] ? parse_time(options[:start]) : nil
      duration = options[:duration] ? parse_time(options[:duration]) : nil

      # size
      width = options[:width]
      height = options[:height]
      size = (width && height) ? "#{width}x#{height}" : nil

      # filepath
      in_filepath = File.expand_path(options[:in_filepath])
      out_filepath = options[:out_filepath] ? File.expand_path(options[:out_filepath]) : "#{in_filepath}.webm"

      # run ffmpeg
      cmd = "ffmpeg #{start ? "-ss #{start}" : ''} #{duration ? "-t #{duration}" : ''} -i \"#{in_filepath}\" -c:v libvpx -minrate 1M -maxrate 1M -b:v 1M -c:a libvorbis #{size ? "-s #{size}" : ''} \"#{out_filepath}\""
      puts "* running command: #{cmd}" if VERBOSE
      `#{cmd}`
    end

    private
    def parse_time(time)
      separated = (time || '').split(':')

      seconds = (separated[-1] || 0).to_f
      minutes = (separated[-2] || 0).to_i
      hours = (separated[-3] || 0).to_i

      minutes += seconds / 60
      hours += minutes / 60
      seconds = seconds % 60.0
      minutes = minutes % 60
      "%02d:%02d:%07.4f" %[hours, minutes, seconds]
    end
  end
end

trap('SIGINT') { puts; exit 1 }
Ffmpeg::ToWebM.start(ARGV)

Gemfile

# last update: 2014.07.15.

source 'http://rubygems.org'

gem 'thor'