[ie/youtube] Fix PhantomJS nsig fallback (#12728)

Also fixes the NSigDeno plugin

Closes #12724
Authored by: bashonly

test/test_youtube_signature.py

@@ -83,6 +83,11 @@ _SIG_TESTS = [
         '2aq0aqSyOoJXtK73m-uME_jv7-pT15gOFC02RFkGMqWpzEICs69VdbwQ0LDp1v7j8xx92efCJlYFYb1sUkkBSPOlPmXgIARw8JQ0qOAOAA',
         'AAOAOq0QJ8wRAIgXmPlOPSBkkUs1bYFYlJCfe29xx8j7vgpDL0QwbdV06sCIEzpWqMGkFR20CFOS21Tp-7vj_EMu-m37KtXJoOy1',
     ),
+    (
+        'https://www.youtube.com/s/player/363db69b/player_ias.vflset/en_US/base.js',
+        '2aq0aqSyOoJXtK73m-uME_jv7-pT15gOFC02RFkGMqWpzEICs69VdbwQ0LDp1v7j8xx92efCJlYFYb1sUkkBSPOlPmXgIARw8JQ0qOAOAA',
+        '0aqSyOoJXtK73m-uME_jv7-pT15gOFC02RFkGMqWpz2ICs6EVdbwQ0LDp1v7j8xx92efCJlYFYb1sUkkBSPOlPmXgIARw8JQ0qOAOAA',
+    ),
 ]
 
 _NSIG_TESTS = [
@@ -234,6 +239,10 @@ _NSIG_TESTS = [
         'https://www.youtube.com/s/player/643afba4/tv-player-ias.vflset/tv-player-ias.js',
         'ir9-V6cdbCiyKxhr', '2PL7ZDYAALMfmA',
     ),
+    (
+        'https://www.youtube.com/s/player/363db69b/player_ias.vflset/en_US/base.js',
+        'eWYu5d5YeY_4LyEDc', 'XJQqf-N7Xra3gg',
+    ),
 ]
 
 

yt_dlp/extractor/youtube/_video.py

@@ -2176,10 +2176,13 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         """Returns tuple of strings: variable assignment code, variable name, variable value code"""
         return self._search_regex(
             r'''(?x)
-                \'use\s+strict\';\s*
+                (?P<q1>["\'])use\s+strict(?P=q1);\s*
                 (?P<code>
                     var\s+(?P<name>[a-zA-Z0-9_$]+)\s*=\s*
-                    (?P<value>"(?:[^"\\]|\\.)+"\.split\("[^"]+"\))
+                    (?P<value>
+                        (?P<q2>["\'])(?:(?!(?P=q2)).|\\.)+(?P=q2)
+                        \.split\((?P<q3>["\'])(?:(?!(?P=q3)).)+(?P=q3)\)
+                    )
                 )[;,]
             ''', jscode, 'global variable', group=('code', 'name', 'value'), default=(None, None, None))
 
@@ -2187,7 +2190,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         global_var, varname, _ = self._extract_player_js_global_var(full_code)
         if global_var:
             self.write_debug(f'Prepending n function code with global array variable "{varname}"')
-            code = global_var + ', ' + code
+            code = global_var + '; ' + code
         else:
             self.write_debug('No global array variable found in player JS')
         return argnames, re.sub(
@@ -2196,7 +2199,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
 
     def _extract_n_function_code(self, video_id, player_url):
         player_id = self._extract_player_info(player_url)
-        func_code = self.cache.load('youtube-nsig', player_id, min_ver='2025.03.21')
+        func_code = self.cache.load('youtube-nsig', player_id, min_ver='2025.03.24')
         jscode = func_code or self._load_player(video_id, player_url)
         jsi = JSInterpreter(jscode)