[nrk:tv] Add format id prefixes

youtube_dl/extractor/nrk.py

@@ -211,7 +211,8 @@ class NRKTVIE(InfoExtractor):
         ]}
 
     def _extract_f4m(self, manifest_url, video_id):
-        return self._extract_f4m_formats(manifest_url + '?hdcore=3.1.1&plugin=aasp-3.1.1.69.124', video_id)
+        return self._extract_f4m_formats(
+            manifest_url + '?hdcore=3.1.1&plugin=aasp-3.1.1.69.124', video_id, f4m_id='hds')
 
     def _real_extract(self, url):
         mobj = re.match(self._VALID_URL, url)
@@ -273,7 +274,7 @@ class NRKTVIE(InfoExtractor):
 
         m3u8_url = re.search(r'data-hls-media="([^"]+)"', webpage)
         if m3u8_url:
-            formats.extend(self._extract_m3u8_formats(m3u8_url.group(1), video_id, 'mp4'))
+            formats.extend(self._extract_m3u8_formats(m3u8_url.group(1), video_id, 'mp4', m3u8_id='hls'))
         self._sort_formats(formats)
 
         subtitles_url = self._html_search_regex(