text: # coding: utf-8
  from __future__ import unicode_literals
  
  from .common import InfoExtractor
  from ..utils import (
      HEADRequest,
      get_element_by_attribute,
      parse_iso8601,
  )
  
  
  class YesJapanIE(InfoExtractor):
      _VALID_URL = r'https?://(?:www\.)?yesjapan\.com/video/(?P<slug>[A-Za-z0-9\-]*)_(?P<id>[A-Za-z0-9]+)\.html'
      _TEST = {
          'url': 'http://www.yesjapan.com/video/japanese-in-5-20-wa-and-ga-particle-usages_726497834.html',
          'md5': 'f0be416314e5be21a12b499b330c21cf',
          'info_dict': {
              'id': '726497834',
              'title': 'Japanese in 5! #20 - WA And GA Particle Usages',
              'description': 'This should clear up some issues most students of Japanese encounter with WA and GA....',
              'ext': 'mp4',
              'timestamp': 1416391590,
              'upload_date': '20141119',
              'thumbnail': r're:^https?://.*\.jpg$',
          }
      }
  
      def _real_extract(self, url):
          video_id = self._match_id(url)
  
          webpage = self._download_webpage(url, video_id)
          title = self._og_search_title(webpage)
          video_url = self._og_search_video_url(webpage)
          description = self._og_search_description(webpage)
          thumbnail = self._og_search_thumbnail(webpage)
  
          timestamp = None
          submit_info = get_element_by_attribute('class', 'pm-submit-data', webpage)
          if submit_info:
              timestamp = parse_iso8601(self._search_regex(
                  r'datetime="([^"]+)"', submit_info, 'upload date', fatal=False, default=None))
  
          # attempt to resolve the final URL in order to get a proper extension
          redirect_req = HEADRequest(video_url)
          req = self._request_webpage(
              redirect_req, video_id, note='Resolving final URL', errnote='Could not resolve final URL', fatal=False)
          if req:
              video_url = req.geturl()
  
          formats = [{
              'format_id': 'sd',
              'url': video_url,
          }]
  
          return {
              'id': video_id,
              'title': title,
              'formats': formats,
              'description': description,
              'timestamp': timestamp,
              'thumbnail': thumbnail,
          }
  