Created
February 12, 2011 10:45
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A simple script to encode video files for Android using the h264 codec. Requires ruby, grep, and ffmpeg.
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#!/usr/bin/ruby | |
# | |
# Copyright (C) 2011 by Jack Senechal | |
# | |
# Permission is hereby granted, free of charge, to any person obtaining a copy | |
# of this software and associated documentation files (the "Software"), to deal | |
# in the Software without restriction, including without limitation the rights | |
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
# copies of the Software, and to permit persons to whom the Software is | |
# furnished to do so, subject to the following conditions: | |
# | |
# The above copyright notice and this permission notice shall be included in | |
# all copies or substantial portions of the Software. | |
# | |
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
# THE SOFTWARE. | |
# | |
#=================================================================# | |
# Set these here variables to match your phone's screen resolution | |
MAX_WIDTH = 480 | |
MAX_HEIGHT = 320 | |
#=================================================================# | |
VERSION = "0.1" | |
input = ARGV.first | |
unless (File.exists? input) | |
puts "Could not find file #{input}" | |
exit | |
end | |
puts "Android Video Encoder v#{VERSION}\n\n" | |
str = `ffmpeg -i "#{input}" 2>&1` | |
line = `echo "#{str}" | grep "PAR.*DAR"` | |
width = line.gsub(/^.* (\d+)x\d+ .*$/, '\1').to_i | |
height = line.gsub(/^.* \d+x(\d+) .*$/, '\1/').to_i | |
dar_x = line.gsub(/^.*DAR (\d+):\d+\].*$/, '\1/').to_i | |
dar_y = line.gsub(/^.*DAR \d+:(\d+)\].*$/, '\1/').to_i | |
ratio = dar_y.to_f / dar_x.to_f | |
output_width = width > MAX_WIDTH ? MAX_WIDTH : width | |
output_height = ((output_width * ratio) / 2).floor * 2 | |
if output_height > MAX_HEIGHT | |
output_height = MAX_HEIGHT | |
output_width = ((output_height * (1/ratio)) / 2).floor * 2 | |
end | |
output_name = File.basename(input, File.extname(input)) | |
puts "input: #{input}" | |
puts "dimensions: #{width}x#{height}" | |
puts "aspect: #{dar_x}:#{dar_y}" | |
puts "ratio: #{ratio}" | |
puts "output dimensions: #{output_width}x#{output_height}" | |
command = %Q{ffmpeg -i "#{input}" | |
-b 384k -vcodec libx264 -flags +loop+mv4 -cmp 256 -partitions | |
+parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 -subq 7 | |
-trellis 1 -refs 5 -bf 0 -flags2 +mixed_refs -coder 0 | |
-me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 | |
-i_qfactor 0.71 -qmin 10 -qmax 51 -qdiff 4 | |
-acodec libfaac -ab 128k -ac 2 | |
-s #{output_width}x#{output_height} | |
-aspect #{dar_x}:#{dar_y} | |
"#{output_name}.mp4"}.gsub(/\n/, '') | |
puts "command: #{command}\n\n" | |
system(command) |
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