[mixcloud] Try to get the m4a url if the mp3 url fails to download (fixes #1939)

youtube_dl/extractor/mixcloud.py

@@ -37,6 +37,9 @@ class MixcloudIE(InfoExtractor):
 
         return None
 
+    def _get_url(self, template_url):
+        return self.check_urls(template_url % i for i in range(30))
+
     def _real_extract(self, url):
         mobj = re.match(self._VALID_URL, url)
 
@@ -52,13 +55,18 @@ class MixcloudIE(InfoExtractor):
         preview_url = self._search_regex(r'data-preview-url="(.+?)"', webpage, u'preview url')
         song_url = preview_url.replace('/previews/', '/cloudcasts/originals/')
         template_url = re.sub(r'(stream\d*)', 'stream%d', song_url)
-        final_song_url = self.check_urls(template_url % i for i in range(30))
+        final_song_url = self._get_url(template_url)
+        if final_song_url is None:
+            self.to_screen('Trying with m4a extension')
+            template_url = template_url.replace('.mp3', '.m4a').replace('originals/', 'm4a/64/')
+            final_song_url = self._get_url(template_url)
+        if final_song_url is None:
+            raise ExtractorError(u'Unable to extract track url')
 
         return {
             'id': track_id,
             'title': info['name'],
             'url': final_song_url,
-            'ext': 'mp3',
             'description': info.get('description'),
             'thumbnail': info['pictures'].get('extra_large'),
             'uploader': info['user']['name'],