text: from __future__ import unicode_literals
  
  import re
  
  from .common import InfoExtractor
  
  
  class NhkVodIE(InfoExtractor):
      _VALID_URL = r'https?://www3\.nhk\.or\.jp/nhkworld/(?P<lang>[a-z]{2})/ondemand/(?P<type>video|audio)/(?P<id>\d{7}|[a-z]+-\d{8}-\d+)'
      # Content available only for a limited period of time. Visit
      # https://www3.nhk.or.jp/nhkworld/en/ondemand/ for working samples.
      _TESTS = [{
          # clip
          'url': 'https://www3.nhk.or.jp/nhkworld/en/ondemand/video/9999011/',
          'md5': '256a1be14f48d960a7e61e2532d95ec3',
          'info_dict': {
              'id': 'a95j5iza',
              'ext': 'mp4',
              'title': "Dining with the Chef - Chef Saito's Family recipe: MENCHI-KATSU",
              'description': 'md5:5aee4a9f9d81c26281862382103b0ea5',
              'timestamp': 1565965194,
              'upload_date': '20190816',
          },
      }, {
          'url': 'https://www3.nhk.or.jp/nhkworld/en/ondemand/video/2015173/',
          'only_matching': True,
      }, {
          'url': 'https://www3.nhk.or.jp/nhkworld/en/ondemand/audio/plugin-20190404-1/',
          'only_matching': True,
      }, {
          'url': 'https://www3.nhk.or.jp/nhkworld/fr/ondemand/audio/plugin-20190404-1/',
          'only_matching': True,
      }]
      _API_URL_TEMPLATE = 'https://api.nhk.or.jp/nhkworld/%sod%slist/v7a/episode/%s/%s/all%s.json'
  
      def _real_extract(self, url):
          lang, m_type, episode_id = re.match(self._VALID_URL, url).groups()
          if episode_id.isdigit():
              episode_id = episode_id[:4] + '-' + episode_id[4:]
  
          is_video = m_type == 'video'
          episode = self._download_json(
              self._API_URL_TEMPLATE % (
                  'v' if is_video else 'r',
                  'clip' if episode_id[:4] == '9999' else 'esd',
                  episode_id, lang, '/all' if is_video else ''),
              episode_id, query={'apikey': 'EJfK8jdS57GqlupFgAfAAwr573q01y6k'})['data']['episodes'][0]
          title = episode.get('sub_title_clean') or episode['sub_title']
  
          def get_clean_field(key):
              return episode.get(key + '_clean') or episode.get(key)
  
          series = get_clean_field('title')
  
          thumbnails = []
          for s, w, h in [('', 640, 360), ('_l', 1280, 720)]:
              img_path = episode.get('image' + s)
              if not img_path:
                  continue
              thumbnails.append({
                  'id': '%dp' % h,
                  'height': h,
                  'width': w,
                  'url': 'https://www3.nhk.or.jp' + img_path,
              })
  
          info = {
              'id': episode_id + '-' + lang,
              'title': '%s - %s' % (series, title) if series and title else title,
              'description': get_clean_field('description'),
              'thumbnails': thumbnails,
              'series': series,
              'episode': title,
          }
          if is_video:
              info.update({
                  '_type': 'url_transparent',
                  'ie_key': 'Piksel',
                  'url': 'https://player.piksel.com/v/refid/nhkworld/prefid/' + episode['vod_id'],
              })
          else:
              audio = episode['audio']
              audio_path = audio['audio']
              info['formats'] = self._extract_m3u8_formats(
                  'https://nhks-vh.akamaihd.net/i%s/master.m3u8' % audio_path,
                  episode_id, 'm4a', m3u8_id='hls', fatal=False)
              for proto in ('rtmpt', 'rtmp'):
                  info['formats'].append({
                      'ext': 'flv',
                      'format_id': proto,
                      'url': '%s://flv.nhk.or.jp/ondemand/mp4:flv%s' % (proto, audio_path),
                      'vcodec': 'none',
                  })
              for f in info['formats']:
                  f['language'] = lang
          return info
  