code: def get_embed_url(self):
          
          embed_url = None
          youtube_embed_url = 'https://www.youtube.com/embed/{}'
          vimeo_embed_url = 'https://player.vimeo.com/video/{}'
  
          # Get video ID from url.
          if re.match(YOUTUBE_URL_RE, self.url):
              embed_url = youtube_embed_url.format(re.match(YOUTUBE_URL_RE, self.url).group(2))
          if re.match(VIMEO_URL_RE, self.url):
              embed_url = vimeo_embed_url.format(re.match(VIMEO_URL_RE, self.url).group(3))
          return embed_url
docs: Get correct embed url for Youtube or Vimeo.