[core] Fix PR #32830 for fixed extensionless output template

PR #32837
* Add track version to track title

youtube_dl/YoutubeDL.py

@@ -139,8 +139,8 @@ def _catch_unsafe_file_extension(func):
         except _UnsafeExtensionError as error:
             self.report_error(
                 '{0} found; to avoid damaging your system, this value is disallowed.'
-                ' If you believe this is an error{1}').format(
+                ' If you believe this is an error{1}'.format(
-                    error.message, bug_reports_message(','))
+                    error_to_compat_str(error), bug_reports_message(',')))
 
     return wrapper
 
@@ -2114,18 +2114,26 @@ class YoutubeDL(object):
                         # TODO: Check acodec/vcodec
                         return False
 
-                    filename_real_ext = os.path.splitext(filename)[1][1:]
+                    exts = [info_dict['ext']]
-                    filename_wo_ext = (
-                        os.path.splitext(filename)[0]
-                        if filename_real_ext == info_dict['ext']
-                        else filename)
                     requested_formats = info_dict['requested_formats']
                     if self.params.get('merge_output_format') is None and not compatible_formats(requested_formats):
                         info_dict['ext'] = 'mkv'
                         self.report_warning(
                             'Requested formats are incompatible for merge and will be merged into mkv.')
+                    exts.append(info_dict['ext'])
+
                     # Ensure filename always has a correct extension for successful merge
-                    filename = '%s.%s' % (filename_wo_ext, info_dict['ext'])
+                    def correct_ext(filename, ext=exts[1]):
+                        if filename == '-':
+                            return filename
+                        f_name, f_real_ext = os.path.splitext(filename)
+                        f_real_ext = f_real_ext[1:]
+                        filename_wo_ext = f_name if f_real_ext in exts else filename
+                        if ext is None:
+                            ext = f_real_ext or None
+                        return join_nonempty(filename_wo_ext, ext, delim='.')
+
+                    filename = correct_ext(filename)
                     if os.path.exists(encodeFilename(filename)):
                         self.to_screen(
                             '[download] %s has already been downloaded and '
@@ -2135,8 +2143,9 @@ class YoutubeDL(object):
                             new_info = dict(info_dict)
                             new_info.update(f)
                             fname = prepend_extension(
-                                self.prepare_filename(new_info),
+                                correct_ext(
-                                'f%s' % f['format_id'], new_info['ext'])
+                                    self.prepare_filename(new_info), new_info['ext']),
+                                'f%s' % (f['format_id'],), new_info['ext'])
                             if not ensure_dir_exists(fname):
                                 return
                             downloaded.append(fname)

youtube_dl/extractor/yandexmusic.py

@@ -106,6 +106,25 @@ class YandexMusicTrackIE(YandexMusicBaseIE):
     }, {
         'url': 'http://music.yandex.com/album/540508/track/4878838',
         'only_matching': True,
+    }, {
+        'url': 'https://music.yandex.ru/album/16302456/track/85430762',
+        'md5': '11b8d50ab03b57738deeaadf661a0a48',
+        'info_dict': {
+            'id': '85430762',
+            'ext': 'mp3',
+            'abr': 128,
+            'title': 'Haddadi Von Engst, Phonic Youth, Super Flu - Til The End (Super Flu Remix)',
+            'filesize': int,
+            'duration': 431.14,
+            'track': 'Til The End (Super Flu Remix)',
+            'album': 'Til The End',
+            'album_artist': 'Haddadi Von Engst, Phonic Youth',
+            'artist': 'Haddadi Von Engst, Phonic Youth, Super Flu',
+            'release_year': 2021,
+            'genre': 'house',
+            'disc_number': 1,
+            'track_number': 2,
+        }
     }]
 
     def _real_extract(self, url):
@@ -116,6 +135,9 @@ class YandexMusicTrackIE(YandexMusicBaseIE):
             'track', tld, url, track_id, 'Downloading track JSON',
             {'track': '%s:%s' % (track_id, album_id)})['track']
         track_title = track['title']
+        track_version = track.get('version')
+        if track_version:
+            track_title = '%s (%s)' % (track_title, track_version)
 
         download_data = self._download_json(
             'https://music.yandex.ru/api/v2.1/handlers/track/%s:%s/web-album_track-track-track-main/download/m' % (track_id, album_id),