@ -74,7 +74,7 @@ class InfoExtractor(object):
"http", "https", "rtsp", "rtmp", "m3u8" or so.
* preference Order number of this format. If this field is
present and not None, the formats get sorted
by this field.
by this field, regardless of all other values.
-1 for default (order by other properties),
-2 or smaller for less than default.
* quality Order number of the video quality of this