[mixcloud] Fix extraction of the audio url (fixes #7751)

youtube_dl/extractor/mixcloud.py

@@ -64,7 +64,8 @@ class MixcloudIE(InfoExtractor):
 
         preview_url = self._search_regex(
             r'\s(?:data-preview-url|m-preview)="([^"]+)"', webpage, 'preview url')
-        song_url = preview_url.replace('/previews/', '/c/originals/')
+        song_url = re.sub(r'audiocdn(\d+)', r'stream\1', preview_url)
+        song_url = song_url.replace('/previews/', '/c/originals/')
         if not self._check_url(song_url, track_id, 'mp3'):
             song_url = song_url.replace('.mp3', '.m4a').replace('originals/', 'm4a/64/')
             if not self._check_url(song_url, track_id, 'm4a'):