+
+ default_lang = 'en'
+ subtitles = {}
+
+ def add_subtitle_item(lang, info_dict):
+ if lang not in subtitles:
+ subtitles[lang] = []
+ subtitles[lang].append(info_dict)
+
+ # chapter_file are not subtitles
+ if 'caption_file' in json_data:
+ add_subtitle_item(default_lang, {
+ 'url': compat_urlparse.urljoin(url, json_data['caption_file']),
+ })
+
+ for subtitle_item in json_data.get('captions', []):
+ lang = subtitle_item.get('language', '').lower() or default_lang
+ add_subtitle_item(lang, {
+ 'url': compat_urlparse.urljoin(url, subtitle_item['url']),
+ })
+
+ description = self._og_search_description(webpage, default=None)
+
+ return {
+ 'id': video_id or display_id,
+ 'title': title,