[niconico] Fix extraction on python3 (closes #17393)

diff --git a/youtube_dl/extractor/niconico.py b/youtube_dl/extractor/niconico.py
index dbe871f1657e8ace3802704d14dd29f49efadec9..76b412ff1ae7d2d0866f3357706db365a9c0e613 100644 (file)
--- a/youtube_dl/extractor/niconico.py
+++ b/youtube_dl/extractor/niconico.py
@@ -252,7 +252,7 @@ class NiconicoIE(InfoExtractor):
                     },
                     'timing_constraint': 'unlimited'
                 }
-            }))
+            }).encode())
 
         resolution = video_quality.get('resolution', {})