[viki] Fix viki play pass authentication (#111)

Authored by: RobinD42

yt_dlp/extractor/viki.py

@@ -255,15 +255,8 @@ class VikiIE(VikiBaseIE):
     def _real_extract(self, url):
         video_id = self._match_id(url)
 
-        resp = self._download_json(
-            'https://www.viki.com/api/videos/' + video_id,
-            video_id, 'Downloading video JSON', headers={
-                'x-client-user-agent': std_headers['User-Agent'],
-                'x-viki-as-id': self._APP,
-                'x-viki-app-ver': self._APP_VERSION,
-            })
-        video = resp['video']
-
+        video = self._call_api(
+            'videos/%s.json' % video_id, video_id, 'Downloading video JSON')
         self._check_errors(video)
 
         title = self.dict_selection(video.get('titles', {}), 'en', allow_fallback=False)
@@ -286,24 +279,6 @@ class VikiIE(VikiBaseIE):
             })
 
         subtitles = {}
-        try:
-            # New way to fetch subtitles
-            new_video = self._download_json(
-                'https://www.viki.com/api/videos/%s' % video_id, video_id,
-                'Downloading new video JSON to get subtitles', fatal=False,
-                headers={
-                    'x-client-user-agent': std_headers['User-Agent'],
-                    'x-viki-as-id': self._APP,
-                    'x-viki-app-ver': self._APP_VERSION,
-                })
-            for sub in new_video.get('streamSubtitles').get('dash'):
-                subtitles[sub.get('srclang')] = [{
-                    'ext': 'vtt',
-                    'url': sub.get('src'),
-                    'completion': sub.get('percentage'),
-                }]
-        except AttributeError:
-            # fall-back to the old way if there isn't a streamSubtitles attribute
         for subtitle_lang, _ in (video.get('subtitle_completions') or {}).items():
             subtitles[subtitle_lang] = [{
                 'ext': subtitles_format,
@@ -386,9 +361,6 @@ class VikiIE(VikiBaseIE):
                     'filesize': int_or_none(urlh.headers.get('Content-Length')),
                 })
 
-        for format_id, format_dict in (resp.get('streams') or {}).items():
-            add_format(format_id, format_dict)
-        if not formats:
         streams = self._call_api(
             'videos/%s/streams.json' % video_id, video_id,
             'Downloading video streams JSON')