From fca5e0439848ed4a4a9bafc8bc923abf98e347e3 Mon Sep 17 00:00:00 2001
From: Benoit Favre <benoit.favre@gmail.com>
Date: Fri, 30 Nov 2018 15:31:09 +1000
Subject: [PATCH] Fix double question mark in url

---
 youtube_dl/extractor/youtube.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index adc6d044d..3e614882b 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -1780,7 +1780,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                         self._downloader.report_warning('Unable to extract storyboard')
                         continue
 
-                    storyboards_url = base_url.replace('$L', compat_str(i)) + '?'
+                    storyboards_url = base_url.replace('$L', compat_str(i)) + '&'
                     for j in range(n_images):
                         url = storyboards_url.replace('$N', filename).replace('$M', compat_str(j)) + 'sigh=' + sigh
                         if j == n_images-1: