-        data_url = unescapeHTML(self._search_regex(
-            r'<span[^>]*\bdata-url=(["\'])(?P<url>(?:(?!\1).)+)\1',
-            webpage, 'iframe player url', group='url'))
+        data_url = update_url_query(unescapeHTML(self._search_regex(
+            (r'<span[^>]*\bdata-url=(["\'])(?P<url>(?:(?!\1).)+)\1',
+             r'<iframe[^>]+\bsrc=(["\'])(?P<url>(?:https?:)?//(?:www\.)?ceskatelevize\.cz/ivysilani/embed/iFramePlayer\.php.*?)\1'),
+            webpage, 'iframe player url', group='url')), query={
+                'autoStart': 'true',
+        })