[ceskatelevize] update to March 2023 changes (#6539)

Note: we could even skip downloading the player.ceskatelevize.cz page
completely as we do not actually need it to get the information we used to
need before the recent website changes. However, we would not catch the
errors that are handled here and the resulting output could be quite
confusing if one of them does happen.

yt_dlp/extractor/ceskatelevize.py

@@ -119,12 +119,10 @@ class CeskaTelevizeIE(InfoExtractor):
                         type_ = 'bonus'
             if not idec:
                 raise ExtractorError('Failed to find IDEC id')
-            iframe_hash = self._download_webpage(
-                'https://www.ceskatelevize.cz/v-api/iframe-hash/',
-                playlist_id, note='Getting IFRAME hash')
-            query = {'hash': iframe_hash, 'origin': 'iVysilani', 'autoStart': 'true', type_: idec, }
+            sidp = playlist_id.rsplit('-')[0]
+            query = {'origin': 'iVysilani', 'autoStart': 'true', 'sidp': sidp, type_: idec, }
             webpage = self._download_webpage(
-                'https://www.ceskatelevize.cz/ivysilani/embed/iFramePlayer.php',
+                'https://player.ceskatelevize.cz/',
                 playlist_id, note='Downloading player', query=query)
 
         NOT_AVAILABLE_STRING = 'This content is not available at your territory due to limited copyright.'
@@ -133,29 +131,9 @@ class CeskaTelevizeIE(InfoExtractor):
         if any(not_found in webpage for not_found in ('Neplatný parametr pro videopřehrávač', 'IDEC nebyl nalezen', )):
             raise ExtractorError('no video with IDEC available', video_id=idec, expected=True)
 
-        type_ = None
-        episode_id = None
-
-        playlist = self._parse_json(
-            self._search_regex(
-                r'getPlaylistUrl\(\[({.+?})\]', webpage, 'playlist',
-                default='{}'), playlist_id)
-        if playlist:
-            type_ = playlist.get('type')
-            episode_id = playlist.get('id')
-
-        if not type_:
-            type_ = self._html_search_regex(
-                r'getPlaylistUrl\(\[\{"type":"(.+?)","id":".+?"\}\],',
-                webpage, 'type')
-        if not episode_id:
-            episode_id = self._html_search_regex(
-                r'getPlaylistUrl\(\[\{"type":".+?","id":"(.+?)"\}\],',
-                webpage, 'episode_id')
-
         data = {
-            'playlist[0][type]': type_,
-            'playlist[0][id]': episode_id,
+            'playlist[0][type]': 'episode',
+            'playlist[0][id]': idec,
             'requestUrl': parsed_url.path,
             'requestSource': 'iVysilani',
         }
@@ -231,7 +209,7 @@ class CeskaTelevizeIE(InfoExtractor):
                 if item.get('type') == 'VOD':
                     subs = item.get('subtitles')
                     if subs:
-                        subtitles = self.extract_subtitles(episode_id, subs)
+                        subtitles = self.extract_subtitles(idec, subs)
 
                 if playlist_len == 1:
                     final_title = playlist_title or title