[screencast] Fix extraction (closes #14590)

youtube_dl/extractor/screencast.py

@@ -90,6 +90,14 @@ class ScreencastIE(InfoExtractor):
                     r'src=(.*?)(?:$|&)', video_meta,
                     'meta tag video URL', default=None)
 
+        if video_url is None:
+            video_url = self._html_search_regex(
+                r'"MediaContentUrl":"([^"]+)"', webpage, 'media content url', default=None)
+
+        if video_url is None:
+            video_url = self._html_search_meta(
+                'og:video', webpage, default=None)
+
         if video_url is None:
             raise ExtractorError('Cannot find video')