From 639f1cea9285d79c0eef4d2ec332b505c37ef34e Mon Sep 17 00:00:00 2001
From: pukkandan <pukkandan.ytdlp@gmail.com>
Date: Wed, 9 Jun 2021 14:43:51 +0530
Subject: Fix `%d` and empty default in outtmpl Closes #388

---
 yt_dlp/utils.py | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'yt_dlp/utils.py')

diff --git a/yt_dlp/utils.py b/yt_dlp/utils.py
index 6737c1965..96f41ddd4 100644
--- a/yt_dlp/utils.py
+++ b/yt_dlp/utils.py
@@ -2107,6 +2107,8 @@ def sanitize_filename(s, restricted=False, is_id=False):
             return '_'
         return char
 
+    if s == '':
+        return ''
     # Handle timestamps
     s = re.sub(r'[0-9]+(?::[0-9]+)+', lambda m: m.group(0).replace(':', '_'), s)
     result = ''.join(map(replace_insane, s))
-- 
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