class Paperclip::Thumbnail

def identified_as_animated?

Return true if ImageMagick's +identify+ returns an animated format 
def identified_as_animated?
  if @identified_as_animated.nil?
    @identified_as_animated = ANIMATED_FORMATS.include? identify("-format %m :file", :file => "#{@file.path}[0]").to_s.downcase.strip
  end
  @identified_as_animated
rescue Cocaine::ExitStatusError => e
  raise Paperclip::Error, "There was an error running `identify` for #{@basename}" if @whiny
rescue Cocaine::CommandNotFoundError => e
  raise Paperclip::Errors::CommandNotFoundError.new("Could not run the `identify` command. Please install ImageMagick.")
end