-        re_video = r'src=\\x22(?P<video_url>http://%s\.tumblr\.com/video_file/%s/(.*?))\\x22 type=\\x22video/(?P<ext>.*?)\\x22' % (blog, video_id)
-        video = re.search(re_video, webpage)
-        if video is None:
-            raise ExtractorError('Unable to extract video')
-        video_url = video.group('video_url')
-        ext = video.group('ext')
-
-        video_thumbnail = self._search_regex(
-            r'posters.*?\[\\x22(.*?)\\x22',
-            webpage, 'thumbnail', fatal=False)  # We pick the first poster
-        if video_thumbnail:
-            video_thumbnail = video_thumbnail.replace('\\\\/', '/')
+        iframe_url = self._search_regex(
+            r'src=\'(https?://www\.tumblr\.com/video/[^\']+)\'',
+            webpage, 'iframe url')
+        iframe = self._download_webpage(iframe_url, video_id)
+        video_url = self._search_regex(r'<source src="([^"]+)"',
+            iframe, 'video url')