[canalplus] Fix m3u8 videos extension

youtube_dl/extractor/canalplus.py

@@ -106,7 +106,7 @@ class CanalplusIE(InfoExtractor):
                 continue
             format_id = fmt.tag
             if format_id == 'HLS':
-                hls_formats = self._extract_m3u8_formats(format_url, video_id, 'flv')
+                hls_formats = self._extract_m3u8_formats(format_url, video_id, 'mp4')
                 for fmt in hls_formats:
                     fmt['preference'] = preference(format_id)
                 formats.extend(hls_formats)