[common] Add _extract_dash_manifest_formats

youtube_dl/extractor/common.py

@@ -1330,6 +1330,21 @@ class InfoExtractor(object):
             })
         return entries
 
+    def _download_dash_manifest(self, dash_manifest_url, video_id, fatal=True):
+        return self._download_xml(
+            dash_manifest_url, video_id,
+            note='Downloading DASH manifest',
+            errnote='Could not download DASH manifest',
+            fatal=fatal)
+
+    def _extract_dash_manifest_formats(self, dash_manifest_url, video_id, fatal=True, namespace=None, formats_dict={}):
+        dash_doc = self._download_dash_manifest(dash_manifest_url, video_id, fatal)
+        if dash_doc is False:
+            return []
+
+        return self._parse_dash_manifest(
+            dash_doc, namespace=namespace, formats_dict=formats_dict)
+
     def _parse_dash_manifest(self, dash_doc, namespace=None, formats_dict={}):
         def _add_ns(path):
             return self._xpath_ns(path, namespace)

youtube_dl/extractor/youtube.py

@@ -1472,14 +1472,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                         return '/signature/%s' % dec_s
 
                     dash_manifest_url = re.sub(r'/s/([a-fA-F0-9\.]+)', decrypt_sig, dash_manifest_url)
-                    dash_doc = self._download_xml(
-                        dash_manifest_url, video_id,
-                        note='Downloading DASH manifest',
-                        errnote='Could not download DASH manifest',
-                        fatal=dash_mpd_fatal)
-
-                    for df in self._parse_dash_manifest(
-                            dash_doc, namespace='urn:mpeg:DASH:schema:MPD:2011', formats_dict=self._formats):
+
+                    for df in self._extract_dash_manifest_formats(
+                            dash_manifest_url, video_id, fatal=dash_mpd_fatal,
+                            namespace='urn:mpeg:DASH:schema:MPD:2011', formats_dict=self._formats):
                         # Do not overwrite DASH format found in some previous DASH manifest
                         if df['format_id'] not in dash_formats:
                             dash_formats[df['format_id']] = df