Quick and dirty transcoder job

transcode.rb

require 'aws-sdk'

Aws.config.update({
  region: "us-east-1",
  credentials: Aws::SharedCredentials.new(profile_name: "...")
})

PRESET_ID = "..."
PIPELINE_ID = "..."

class Track
  attr_reader :album

  def initialize(album, path)
    @album = album
    @path = path
  end

  def input
    {
      key: @path
    }
  end

  def name
    File.basename(@path, ".wma")
  end

  def output
    {
      key: "#{album.artist}/#{album.name}/#{name}.mp3",
      preset_id: PRESET_ID
    }
  end
end

class Album
  BASE_PATH = "base-bucket"
  attr_reader :name, artist

  def initialize(artist, name)
    @s3 = Aws::S3::Client.new

    @artist = artist
    @name = name
  end

  def tracks
    @tracks ||= begin
      objects = @s3.list_objects_v2({bucket: BASE_PATH, prefix: "#{artist}/#{name}"})
      objects.contents.map {|object| Track.new(self, object.key) }
    end
  end
end

def transcode(album)
  client = Aws::ElasticTranscoder::Client.new

  album.tracks.each do |track|
    resp = client.create_job({
      pipeline_id: PIPELINE_ID,
      output_key_prefix: "encoded/",
      input: track.input,
      output: track.output,
    })
  end
end

# Place files in a specific bucket like so:
# transcode-bucket
#   - my artist
#     - album 1
#     - album 2

["...", "..."].each do |name|
  transcode Album.new("...", name)
end