-                    ext = determine_ext(media_url)
-                    if type_ == 'application/x-mpegURL' or ext == 'm3u8':
-                        m3u8_formats = self._extract_m3u8_formats(
-                            media_url, video_id, 'mp4', m3u8_id='hls', fatal=False)
-                        if m3u8_formats:
-                            formats.extend(m3u8_formats)
-                    elif type_ == 'application/f4m' or ext == 'f4m':
-                        f4m_formats = self._extract_f4m_formats(
-                            media_url, video_id, preference=-1, f4m_id='hds', fatal=False)
-                        if f4m_formats:
-                            formats.extend(f4m_formats)
+                    ext = mimetype2ext(type_) or determine_ext(media_url)
+                    if ext == 'm3u8':
+                        formats.extend(self._extract_m3u8_formats(
+                            media_url, video_id, 'mp4', preference=-1,
+                            m3u8_id='hls', fatal=False))
+                    elif ext == 'f4m':
+                        formats.extend(self._extract_f4m_formats(
+                            media_url, video_id, preference=-1, f4m_id='hds', fatal=False))