Class: ActiveEncode::EngineAdapters::FfmpegAdapter

Inherits:
Object
  • Object
show all
Defined in:
lib/active_encode/engine_adapters/ffmpeg_adapter.rb

Constant Summary collapse

WORK_DIR =

Should read from config

ENV["ENCODE_WORK_DIR"] || "encodes"

Instance Method Summary collapse

Instance Method Details

#cancel(id) ⇒ Object

Cancel ongoing encode using pid file



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# File 'lib/active_encode/engine_adapters/ffmpeg_adapter.rb', line 98

def cancel(id)
  pid = get_pid(id)
  Process.kill 'SIGTERM', pid.to_i

  find id
end

#create(input_url, options = {}) ⇒ Object 



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# File 'lib/active_encode/engine_adapters/ffmpeg_adapter.rb', line 9

def create(input_url, options = {})
  new_encode = ActiveEncode::Base.new(input_url, options)
  new_encode.id = SecureRandom.uuid
  new_encode.created_at = Time.new
  new_encode.updated_at = Time.new
  new_encode.current_operations = []
  new_encode.output = []

  # Create a working directory that holds all output files related to the encode
  FileUtils.mkdir_p working_path("", new_encode.id)
  FileUtils.mkdir_p working_path("outputs", new_encode.id)

  # Extract technical metadata from input file
  `mediainfo --Output=XML --LogFile=#{working_path("input_metadata", new_encode.id)} #{input_url}`
  new_encode.input = build_input new_encode

  if new_encode.input.duration.blank?
    new_encode.state = :failed
    new_encode.percent_complete = 1

    if new_encode.input.file_size.blank?
      new_encode.errors = ["#{input_url} does not exist or is not accessible"]
    else
      new_encode.errors = ["Error inspecting input: #{input_url}"]
    end

    write_errors new_encode
    return new_encode
  end

  new_encode.state = :running
  new_encode.percent_complete = 1
  new_encode.errors = []

  # Run the ffmpeg command and save its pid
  command = ffmpeg_command(input_url, new_encode.id, options)
  pid = Process.spawn(command)
  File.open(working_path("pid", new_encode.id), 'w') { |file| file.write pid }
  new_encode.input.id = pid

  # Prevent zombie process
  Process.detach(pid)

  new_encode
end

#find(id, opts = {}) ⇒ Object

Return encode object from file system



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# File 'lib/active_encode/engine_adapters/ffmpeg_adapter.rb', line 56

def find(id, opts={})
  encode_class = opts[:cast]
  encode = ActiveEncode::Base.new(nil, opts)
  encode.id = id
  encode.output = []
  encode.created_at, encode.updated_at = get_times encode.id
  encode.input = build_input encode
  encode.percent_complete = calculate_percent_complete encode

  pid = get_pid(id)
  encode.input.id = pid if pid.present?

  if File.file? working_path("error.log", id)
    error = File.read working_path("error.log", id)
    if error.present?
      encode.state = :failed
      encode.errors = [error]

      return encode
    end
  end

  encode.errors = []

  encode.current_operations = []
  encode.created_at, encode.updated_at = get_times encode.id

  if running? pid
    encode.state = :running
    encode.current_operations = ["transcoding"]
  elsif progress_ended?(encode.id) && encode.percent_complete == 100
      encode.state = :completed
  elsif encode.percent_complete < 100
      encode.state = :cancelled
  end

  encode.output = build_outputs encode if encode.completed?

  encode
end