-            webpage, 'uploader', fatal=False)
-        thumbnail_part = self._html_search_regex(
-            r'(?s)<div id="emission".*?<img src="([^"]+)"', webpage,
-            'thumbnail', fatal=False)
-        if thumbnail_part is None:
-            thumbnail = None
-        else:
-            thumbnail = compat_urlparse.urljoin(baseurl, thumbnail_part)
-        description = self._html_search_regex(
-            r'(?s)<p class="desc">(.*?)</p>', webpage, 'description')
-
-        info = json.loads(params['infoData'][0])[0]
-        duration = info.get('media_length')
-        upload_date_candidate = info.get('media_section5')
-        upload_date = (
-            upload_date_candidate
-            if (upload_date_candidate is not None and
-                re.match(r'[0-9]{8}$', upload_date_candidate))
-            else None)
+            webpage, 'uploader', default=None)
+        vcodec = 'none' if determine_ext(video_url.lower()) == 'mp3' else None