A small script to transcode a directory tree of media files with ffmpeg.

transcode.rb

#!/usr/bin/env ruby
#
# This is a small script to transcode a directory of media files
# with ffmpeg.

require 'fileutils'

# These are config values are for my project. Swap in your own.
input_dir="/Volumes/severn.5/video"
output_dir="/Volumes/severn.4/video/transcoded"
input_type="MOV"
ffmpeg_options="-y -vcodec prores -profile:v 2 -acodec copy"

to_convert = Dir.glob("#{input_dir}/**/*.#{input_type}")

# Build a list of files to convert.
File.open('transcode_todo.txt', 'w') do |f|
  f.write(to_convert.join("\n"))
end

total = to_convert.length
count = 0

def log_completed(path)
  File.open('transcode_done.txt', 'a') do |f|
    f.write(path + "\n")
  end
end

def log_failed(path)
  File.open('transcode_failed.txt', 'a') do |f|
    f.write(path + "\n")
  end
end


to_convert.each do |input_path|
  count += 1

  # Get the new file path.
  target_path = "#{output_dir}/#{input_path[input_dir.length+1..-1]}"

  # Add the mod date into the filename
  clip_name = File.basename target_path
  date_label = File.mtime(input_path).strftime("%Y.%m.%d-%H.%M.%S")
  target_filename = "#{date_label}__#{clip_name}"

  # Build the output path
  target_dir = File.dirname target_path
  FileUtils.mkdir_p target_dir
  output_path = "#{target_dir}/#{target_filename}"

  # Do it.
  10.times.each{|i| puts "\n"}
  puts "[#{count}/#{total}] Converting #{input_path} to #{output_path}"

  %x{ffmpeg -i #{input_path} #{ffmpeg_options} #{output_path}}
  if $?.exitstatus == 0
    log_completed(input_path)
  else
    log_failed(input_path)
  end
end

transcode_threads.rb

#!/usr/bin/env ruby
#
# This is a small script to transcode a directory of media files
# with ffmpeg.

require 'fileutils'
require 'thread'

# These are config values are for my project. Swap in your own.
INPUT_DIR="/Volumes/severn.5/video"
OUTPUT_DIR="/Volumes/severn.4/video/transcoded"
input_type="MOV"
FFMPEG_OPTIONS="-y -vcodec prores -profile:v 2 -acodec copy -threads 4"


def log_completed(path)
  File.open('transcode_done.txt', 'a') do |f|
    f.write(path + "\n")
  end
end

def log_failed(path)
  File.open('transcode_failed.txt', 'a') do |f|
    f.write(path + "\n")
  end
end

def convert_path(input_path)
  # Get the new file path.
  target_path = "#{OUTPUT_DIR}/#{input_path[INPUT_DIR.length+1..-1]}"

  # Add the mod date into the filename
  clip_name = File.basename target_path
  date_label = File.mtime(input_path).strftime("%Y.%m.%d-%H.%M.%S")
  target_filename = "#{date_label}__#{clip_name}"

  # Build the output path
  target_dir = File.dirname target_path
  FileUtils.mkdir_p target_dir
  output_path = "#{target_dir}/#{target_filename}"

  # Do it.
  10.times.each{|i| puts "\n"}
  puts "Converting #{input_path} to #{output_path}"

  %x{ffmpeg -i #{input_path} #{FFMPEG_OPTIONS} #{output_path}}
  if $?.exitstatus == 0
    log_completed(input_path)
  else
    log_failed(input_path)
  end
end


queue = Queue.new

FileUtils.touch('transcode_done.txt')
already_converted = File.open('transcode_done.txt',
'r').readlines().collect{|v| v.strip() }

all_videos = Dir.glob("#{INPUT_DIR}/**/*.#{input_type}")

all_videos.each do |v|

  if already_converted.include? v
    puts "already converted #{v}"
  else
    queue.push v
  end
end

threads = 7.times.collect do
  Thread.new do
    while !queue.empty?
      path = queue.pop
      convert_path(path)
    end
  end
 end

threads.each {|t| t.join}