{ type: Mime::WEBM.to_s, src: options[:helper].polymorphic_url(self, format: :webm) },
        { type: Mime::MP4.to_s,  src: options[:helper].polymorphic_url(self, format: :mp4) },
        { type: Mime::FLV.to_s,  src: options[:helper].polymorphic_url(self, format: :flv) }