How to use the youtube-dl.youtube_dl.compat.compat_urlparse.urljoin function in youtube_dl

fmt = 'rtmp'
                format_info.update({
                    'url': host,
                    'play_path': path,
                    'ext': 'flv',
                })
            else:
                if s.get('format') == 'm3u8_playlist':
                    fmt = 'hls'
                    format_info.update({
                        'protocol': 'm3u8_native',
                        'ext': 'mp4',
                    })
                else:
                    fmt = format_info['ext'] = determine_ext(path)
                format_url = compat_urlparse.urljoin(host, path)
                format_info['url'] = format_url
            format_info['format_id'] = fmt + ('-%d' % tbr if tbr else '')
            formats.append(format_info)

        closed_captions = self._html_search_regex(
            r'"closedcaptions":(\[[^\]]+\])', webpage, 'closed captions',
            default='[]')

        cc_json = self._parse_json(closed_captions, video_id, fatal=False)
        subtitles = {}
        if cc_json:
            for closed_caption in cc_json:
                lang = closed_caption['lang']
                if lang not in subtitles:
                    subtitles[lang] = []
                subtitles[lang].append({

def _real_extract(self, url):
        video_id = self._match_id(url)
        webpage = self._download_webpage(url, video_id)

        # Single video on top of the page
        video_link = self._search_regex(
            r'<a href="([^">\s*.*?url\s*=\s*"([^"]+)"',
            webpage)
        entries = [
            self.url_result(compat_urlparse.urljoin(
                self.http_scheme() + '//spiegel.de/', embed_path))
            for embed_path in embeds]
        if embeds:
            return self.playlist_result(entries)

        return self.playlist_from_matches(
            NexxEmbedIE._extract_urls(webpage), ie=NexxEmbedIE.ie_key())</a>

def _get_player_info(self, url, webpage):
        player_data = extract_attributes(self._search_regex(
            r'(?s)()',
            webpage, 'ms video player'))
        video_id = player_data['data-media-id']
        if player_data.get('data-cms-id') == 'ooyala':
            return self.url_result(
                'ooyala:%s' % video_id, ie=OoyalaIE.ie_key(), video_id=video_id)
        config_url = compat_urlparse.urljoin(url, player_data['data-config'])
        config = self._download_json(
            config_url, video_id, 'Downloading config JSON')
        mmc_url = config['services']['mmc']

        duration = None
        formats = []
        for m_url in (mmc_url, mmc_url.replace('/flash.json', '/html5.json')):
            mmc = self._download_json(
                m_url, video_id, 'Downloading mmc JSON')
            if not duration:
                duration = int_or_none(mmc.get('duration'))
            for location in mmc['locations']:
                gat = self._proto_relative_url(location.get('gat'), 'http:')
                gcp = location.get('gcp')
                ogn = location.get('ogn')
                if None in (gat, gcp, ogn):

def _login_step(self, form_html, fallback_action_url, extra_form_data, note, referrer_url):
        action_url = self._search_regex(
            r']+action=(["\'])(?P.+?)\1', form_html,
            'post url', default=fallback_action_url, group='url')

        if not action_url.startswith('http'):
            action_url = compat_urlparse.urljoin(self._SIGNIN_URL, action_url)

        form_data = self._hidden_inputs(form_html)
        form_data.update(extra_form_data)

        try:
            response = self._download_json(
                action_url, None, note,
                data=urlencode_postdata(form_data),
                headers={
                    'Referer': referrer_url,
                    'X-Requested-With': 'XMLHttpRequest',
                })
        except ExtractorError as e:
            if isinstance(e.cause, compat_HTTPError) and e.cause.code == 500:
                response = self._parse_json(e.cause.read().decode('utf-8'), None)
                self._check_error(response, ('email', 'password'))

def _real_extract(self, url):
        mobj = re.match(self._VALID_URL, url)
        page_title = mobj.group('title')
        webpage = self._download_webpage(url, page_title)
        slideshare_obj = self._search_regex(
            r'\$\.extend\(.*?slideshare_object,\s*(\{.*?\})\);',
            webpage, 'slideshare object')
        info = json.loads(slideshare_obj)
        if info['slideshow']['type'] != 'video':
            raise ExtractorError('Webpage type is "%s": only video extraction is supported for Slideshare' % info['slideshow']['type'], expected=True)

        doc = info['doc']
        bucket = info['jsplayer']['video_bucket']
        ext = info['jsplayer']['video_extension']
        video_url = compat_urlparse.urljoin(bucket, doc + '-SD.' + ext)
        description = get_element_by_id('slideshow-description-paragraph', webpage) or self._html_search_regex(
            r'(?s)]+itemprop="description"[^&gt;]*&gt;(.+?)<p></p>', webpage,
            'description', fatal=False)

        return {
            '_type': 'video',
            'id': info['slideshow']['id'],
            'title': info['slideshow']['title'],
            'ext': ext,
            'url': video_url,
            'thumbnail': info['slideshow']['pin_image_url'],
            'description': description.strip() if description else None,
        }

'ext': 'flv',
                    'format_id': 'rtmp-%d' % (rtmp_count if bitrate is None else bitrate),
                    'tbr': bitrate,
                    'filesize': filesize,
                    'width': width,
                    'height': height,
                })
                if transform_rtmp_url:
                    streamer, src = transform_rtmp_url(streamer, src)
                    formats[-1].update({
                        'url': streamer,
                        'play_path': src,
                    })
                continue

            src_url = src if src.startswith('http') else compat_urlparse.urljoin(base, src)
            src_url = src_url.strip()

            if proto == 'm3u8' or src_ext == 'm3u8':
                m3u8_formats = self._extract_m3u8_formats(
                    src_url, video_id, ext or 'mp4', m3u8_id='hls', fatal=False)
                if len(m3u8_formats) == 1:
                    m3u8_count += 1
                    m3u8_formats[0].update({
                        'format_id': 'hls-%d' % (m3u8_count if bitrate is None else bitrate),
                        'tbr': bitrate,
                        'width': width,
                        'height': height,
                    })
                formats.extend(m3u8_formats)
                continue