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