+ info = None
+ redirects = []
+ redirect_urls = set()
+
+ def extract_redirect_urls(info):
+ for encoding_name in ('recommended_encoding', 'alternate_encoding'):
+ redirect = info.get(encoding_name)
+ if not redirect:
+ continue
+ redirect_url = redirect.get('url')
+ if redirect_url and redirect_url not in redirect_urls:
+ redirects.append(redirect)
+ redirect_urls.add(redirect_url)
+ encodings = info.get('encodings')
+ if isinstance(encodings, list):
+ for encoding in encodings:
+ encoding_url = url_or_none(encoding)
+ if encoding_url and encoding_url not in redirect_urls:
+ redirects.append({'url': encoding_url})
+ redirect_urls.add(encoding_url)
+
+ chapters = []
+ # Player pages may also serve different qualities
+ for page in ('widget/partnerplayer', 'portalplayer'):
+ player = self._download_webpage(
+ 'http://player.pbs.org/%s/%s' % (page, video_id),
+ display_id, 'Downloading %s page' % page, fatal=False)
+ if player:
+ video_info = self._extract_video_data(
+ player, '%s video data' % page, display_id, fatal=False)
+ if video_info:
+ extract_redirect_urls(video_info)
+ if not info:
+ info = video_info
+ if not chapters:
+ raw_chapters = video_info.get('chapters') or []
+ if not raw_chapters:
+ for chapter_data in re.findall(r'(?s)chapters\.push\(({.*?})\)', player):
+ chapter = self._parse_json(chapter_data, video_id, js_to_json, fatal=False)
+ if not chapter:
+ continue
+ raw_chapters.append(chapter)
+ for chapter in raw_chapters:
+ start_time = float_or_none(chapter.get('start_time'), 1000)
+ duration = float_or_none(chapter.get('duration'), 1000)
+ if start_time is None or duration is None:
+ continue
+ chapters.append({
+ 'start_time': start_time,
+ 'end_time': start_time + duration,
+ 'title': chapter.get('title'),
+ })