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# File 'lib/moshy/prep.rb', line 3
def cli(args)
opts = Slop::Options.new
opts.banner = "Usage: moshy.rb -m prep -i <file> -o <output> [options]\n"
opts.separator 'Required Parameters:'
opts.string '-i', '--input', 'Input file path - can be anything that ffmpeg supports.'
opts.string '-o', '--output', 'File output path - should end in .avi.'
opts.separator 'Optional Parameters:'
opts.integer '-b', '--bitrate', 'Bitrate amount (kb/s). Defaults to 4196. Larger number means higher quality, but larger size.'
opts.on '-h', '--help' do
puts opts
puts "\n"
puts \
"Preps a video file for datamoshing with moshy by converting it into an
AVI with no B-Frames (they're not good for moshing), and placing as
few I-Frames as possible. Requires ffmpeg be installed locally. Check
the repository's README.md for more information on how to install ffmpeg.
This command is meant to be a simple one-liner that makes your datamoshing
workflow faster. Under the covers, it runs the following ffmpeg command:
ffmpeg -i <moshy input> -bf 0 -g 600 -b:v <moshy bitrate> -o <moshy output>
This takes in an input file (it should theoretically work with any video
file type that ffmpeg supports), makes sure that no B-Frames are rendered,
and sets the ideal I-frame interval to 600 (ffmpeg's max). This seems to
mean that an I-frame will only show up every 30 to 25 seconds
(600f / 30fps = 20s or 600f / 24fps = 25s), but I-Frames must be deposited
wherever there is a hard cut or transition in a video where a P-frame would
not be able to properly predict the motion of pixels."
exit
end
default = {
:bitrate => 4196
}
parser = Slop::Parser.new(opts)
slop_options = parser.parse(ARGV)
@options = default.merge(slop_options) { |key, oldval, newval|
if newval.nil?
oldval
else
newval
end
}
mandatory = [:input, :output]
missing = mandatory.select{ |param| @options[param].nil? }
unless missing.empty?
puts "Missing options: #{missing.join(', ')}"
puts slop_options
exit
end
prep @options[:input], @options[:output], @options[:bitrate]
end
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