From 2d2fa82d172a10a49fb5449fa35bc409de778f05 Mon Sep 17 00:00:00 2001
From: Yen Chi Hsuan <yan12125@gmail.com>
Date: Sat, 30 Jan 2016 22:52:23 +0800
Subject: [PATCH] [common] Add _extract_dash_manifest_formats

---
 youtube_dl/extractor/common.py  | 15 +++++++++++++++
 youtube_dl/extractor/youtube.py | 12 ++++--------
 2 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 5a2b7a7219..199a04d1c2 100644
--- a/youtube_dl/extractor/common.py
+++ b/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)
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index a2f7760502..d6fef39e9e 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/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