protected function buildVideoSubdef(SimpleXMLElement $sd)
    {
        $video = new Video($this->translator);
        if ($sd->size) {
            $video->setOptionValue(Video::OPTION_SIZE, (int) $sd->size);
        }
        if ($sd->acodec) {
            $video->setOptionValue(Video::OPTION_ACODEC, (string) $sd->acodec);
        }
        if ($sd->vcodec) {
            $video->setOptionValue(Video::OPTION_VCODEC, (string) $sd->vcodec);
        }
        if ($sd->fps) {
            $video->setOptionValue(Video::OPTION_FRAMERATE, (int) $sd->fps);
        }
        if ($sd->bitrate) {
            $video->setOptionValue(Video::OPTION_BITRATE, (int) $sd->bitrate);
        }
        if ($sd->audiobitrate) {
            $video->setOptionValue(Video::OPTION_AUDIOBITRATE, (int) $sd->audiobitrate);
        }
        if ($sd->audiosamplerate) {
            $video->setOptionValue(Video::OPTION_AUDIOSAMPLERATE, (int) $sd->audiosamplerate);
        }
        if ($sd->GOPsize) {
            $video->setOptionValue(Video::OPTION_GOPSIZE, (int) $sd->GOPsize);
        }
        return $video;
    }