[livestream] Do not fail if SMIL download fails

youtube_dl/extractor/livestream.py

@@ -33,28 +33,18 @@ class LivestreamIE(InfoExtractor):
         }
     }
 
-    def _extract_video_info(self, video_data):
-        video_id = compat_str(video_data['id'])
-
-        FORMAT_KEYS = (
-            ('sd', 'progressive_url'),
-            ('hd', 'progressive_url_hd'),
-        )
-        formats = [{
-            'format_id': format_id,
-            'url': video_data[key],
-            'quality': i + 1,
-        } for i, (format_id, key) in enumerate(FORMAT_KEYS)
-            if video_data.get(key)]
-
-        smil_url = video_data.get('smil_url')
-        if smil_url:
+    def _parse_smil(self, video_id, smil_url):
+        formats = []
         _SWITCH_XPATH = (
             './/{http://www.w3.org/2001/SMIL20/Language}body/'
             '{http://www.w3.org/2001/SMIL20/Language}switch')
         smil_doc = self._download_xml(
-                smil_url, video_id, note='Downloading SMIL information')
-
+            smil_url, video_id,
+            note='Downloading SMIL information',
+            errnote='Unable to download SMIL information',
+            fatal=False)
+        if smil_doc is False:  # Download failed
+            return formats
         title_node = find_xpath_attr(
             smil_doc, './/{http://www.w3.org/2001/SMIL20/Language}meta',
             'name', 'title')
@@ -84,6 +74,25 @@ class LivestreamIE(InfoExtractor):
                 'tbr': tbr,
                 'preference': -1000,
             })
+        return formats
+
+    def _extract_video_info(self, video_data):
+        video_id = compat_str(video_data['id'])
+
+        FORMAT_KEYS = (
+            ('sd', 'progressive_url'),
+            ('hd', 'progressive_url_hd'),
+        )
+        formats = [{
+            'format_id': format_id,
+            'url': video_data[key],
+            'quality': i + 1,
+        } for i, (format_id, key) in enumerate(FORMAT_KEYS)
+            if video_data.get(key)]
+
+        smil_url = video_data.get('smil_url')
+        if smil_url:
+            formats.extend(self._parse_smil(video_id, smil_url))
         self._sort_formats(formats)
 
         return {