[common] correctly lower the preference of m3u8 master manifest format

diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 67f49f51b52c85c488851903e309c38c217f23dc..0891309dd506dab2f7c44c256fdd6203e846be80 100644 (file)
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -1140,7 +1140,7 @@ class InfoExtractor(object):
             'url': m3u8_url,
             'ext': ext,
             'protocol': 'm3u8',
-            'preference': -100,
+            'preference': preference - 100 if preference else -100,
             'resolution': 'multiple',
             'format_note': 'Quality selection URL',
         }