Plugin cleanup and tweaks

plugins/youtube_download/yt_dlp/extractor/viki.py

@@ -1,5 +1,3 @@
-# coding: utf-8
-from __future__ import unicode_literals
 import hashlib
 import hmac
 import json
@@ -99,14 +97,7 @@ class VikiBaseIE(InfoExtractor):
                     self.raise_login_required(message)
                 self._raise_error(message)
 
-    def _real_initialize(self):
-        self._login()
-
-    def _login(self):
-        username, password = self._get_login_info()
-        if username is None:
-            return
-
+    def _perform_login(self, username, password):
         self._token = self._call_api(
             'sessions.json', None, 'Logging in', fatal=False,
             data={'username': username, 'password': password}).get('token')
@@ -268,11 +259,10 @@ class VikiIE(VikiBaseIE):
         mpd_content = self._download_webpage(mpd_url, video_id, note='Downloading initial MPD manifest')
         mpd_url = self._search_regex(
             r'(?mi)<BaseURL>(http.+.mpd)', mpd_content, 'new manifest', default=mpd_url)
-        if 'mpdhd_high' not in mpd_url:
+        if 'mpdhd_high' not in mpd_url and 'sig=' not in mpd_url:
             # Modify the URL to get 1080p
             mpd_url = mpd_url.replace('mpdhd', 'mpdhd_high')
         formats = self._extract_mpd_formats(mpd_url, video_id)
-        self._sort_formats(formats)
 
         return {
             'id': video_id,