Plugin cleanup and tweaks

plugins/youtube_download/yt_dlp/extractor/udn.py

@@ -1,6 +1,3 @@
-# coding: utf-8
-from __future__ import unicode_literals
-
 import re
 
 from .common import InfoExtractor
@@ -16,6 +13,7 @@ class UDNEmbedIE(InfoExtractor):
     IE_DESC = '聯合影音'
     _PROTOCOL_RELATIVE_VALID_URL = r'//video\.udn\.com/(?:embed|play)/news/(?P<id>\d+)'
     _VALID_URL = r'https?:' + _PROTOCOL_RELATIVE_VALID_URL
+    _EMBED_REGEX = [r'<iframe[^>]+src="(?:https?:)?(?P<url>%s)"' % _PROTOCOL_RELATIVE_VALID_URL]
     _TESTS = [{
         'url': 'http://video.udn.com/embed/news/300040',
         'info_dict': {
@@ -92,8 +90,6 @@ class UDNEmbedIE(InfoExtractor):
                     })
                 formats.append(a_format)
 
-        self._sort_formats(formats)
-
         return {
             'id': video_id,
             'formats': formats,