[letv] fix height

youtube_dl/extractor/letv.py

@@ -15,6 +15,7 @@ from ..utils import (
     determine_ext,
     ExtractorError,
     parse_iso8601,
+    int_or_none,
 )
 
 
@@ -134,7 +135,7 @@ class LetvIE(InfoExtractor):
                 }
 
                 if format_id[-1:] == 'p':
-                    url_info_dict['height'] = format_id[:-1]
+                    url_info_dict['height'] = int_or_none(format_id[:-1])
 
                 urls.append(url_info_dict)