RVideo Extensions

mp4creator.rb

module RVideo
  module Tools
    class Mp4creator
      include AbstractTool::InstanceMethods

      attr_reader :raw_metadata

      def tool_command
        'mp4creator'
      end

      private

      def parse_result(result)
        if result.empty?
          @raw_metadata = "OK"
          return true
        end

        if m = /MP4ERROR: MP4Open: failed: No such file or directory\n/.match(result)
          raise TranscoderError::InputFileNotFound
        end

        if m = /ReadAtom: invalid atom size/.match(result)
          raise TranscoderError::InvalidFile, "input must be a valid MP4 file"
        end

        if m = /usage: mp4creator  /i.match(result)
          raise TranscoderError::InvalidCommand, "command printed mp4creator help text (and presumably didn't execute)"
        end

        raise TranscoderError::UnexpectedResult, result
      end

    end
  end
end

renice_rvideo.rb

require 'rvideo'

module RVideo # :nodoc:
  module Tools # :nodoc:
    class AbstractTool
      module InstanceMethods

        alias :original_execute :execute
        def execute
          original_command = @command
          result = nil
          begin
            @command = "nice #{@command}"
            result = original_execute
          ensure
            @command = original_command
          end
          result
        end
      end
    end
  end
end