text: # coding: utf-8
  from __future__ import unicode_literals
  
  import re
  
  from .common import InfoExtractor
  
  
  class OnceIE(InfoExtractor):
      _VALID_URL = r"https?://.+?\.unicornmedia\.com/now/(?:ads/vmap/)?[^/]+/[^/]+/(?P<domain_id>[^/]+)/(?P<application_id>[^/]+)/(?:[^/]+/)?(?P<media_item_id>[^/]+)/content\.(?:once|m3u8|mp4)"
      ADAPTIVE_URL_TEMPLATE = (
          "http://once.unicornmedia.com/now/master/playlist/%s/%s/%s/content.m3u8"
      )
      PROGRESSIVE_URL_TEMPLATE = (
          "http://once.unicornmedia.com/now/media/progressive/%s/%s/%s/%s/content.mp4"
      )
  
      def _extract_once_formats(self, url, http_formats_preference=None):
          domain_id, application_id, media_item_id = re.match(
              OnceIE._VALID_URL, url
          ).groups()
          formats = self._extract_m3u8_formats(
              self.ADAPTIVE_URL_TEMPLATE % (domain_id, application_id, media_item_id),
              media_item_id,
              "mp4",
              m3u8_id="hls",
              fatal=False,
          )
          progressive_formats = []
          for adaptive_format in formats:
              # Prevent advertisement from embedding into m3u8 playlist (see
              # https://github.com/ytdl-org/youtube-dl/issues/8893#issuecomment-199912684)
              adaptive_format["url"] = re.sub(
                  r"\badsegmentlength=\d+", r"adsegmentlength=0", adaptive_format["url"]
              )
              rendition_id = self._search_regex(
                  r"/now/media/playlist/[^/]+/[^/]+/([^/]+)",
                  adaptive_format["url"],
                  "redition id",
                  default=None,
              )
              if rendition_id:
                  progressive_format = adaptive_format.copy()
                  progressive_format.update(
                      {
                          "url": self.PROGRESSIVE_URL_TEMPLATE
                          % (domain_id, application_id, rendition_id, media_item_id),
                          "format_id": adaptive_format["format_id"].replace(
                              "hls", "http"
                          ),
                          "protocol": "http",
                          "preference": http_formats_preference,
                      }
                  )
                  progressive_formats.append(progressive_format)
          self._check_formats(progressive_formats, media_item_id)
          formats.extend(progressive_formats)
          return formats
  