text: from __future__ import unicode_literals
  
  from .common import InfoExtractor
  from ..utils import parse_duration
  
  
  class HistoricFilmsIE(InfoExtractor):
      _VALID_URL = r'https?://(?:www\.)?historicfilms\.com/(?:tapes/|play)(?P<id>\d+)'
      _TEST = {
          'url': 'http://www.historicfilms.com/tapes/4728',
          'md5': 'd4a437aec45d8d796a38a215db064e9a',
          'info_dict': {
              'id': '4728',
              'ext': 'mov',
              'title': 'Historic Films: GP-7',
              'description': 'md5:1a86a0f3ac54024e419aba97210d959a',
              'thumbnail': r're:^https?://.*\.jpg$',
              'duration': 2096,
          },
      }
  
      def _real_extract(self, url):
          video_id = self._match_id(url)
  
          webpage = self._download_webpage(url, video_id)
  
          tape_id = self._search_regex(
              [r'class="tapeId"[^>]*>([^<]+)<', r'tapeId\s*:\s*"([^"]+)"'],
              webpage, 'tape id')
  
          title = self._og_search_title(webpage)
          description = self._og_search_description(webpage)
          thumbnail = self._html_search_meta(
              'thumbnailUrl', webpage, 'thumbnails') or self._og_search_thumbnail(webpage)
          duration = parse_duration(self._html_search_meta(
              'duration', webpage, 'duration'))
  
          video_url = 'http://www.historicfilms.com/video/%s_%s_web.mov' % (tape_id, video_id)
  
          return {
              'id': video_id,
              'url': video_url,
              'title': title,
              'description': description,
              'thumbnail': thumbnail,
              'duration': duration,
          }
  