[ceskatelevize] Add support for live streams

Live streams has no playlist title, use title of the stream containing
TV channel name. Internal m3u8 handler doesn't seem to handle well
continuous streams. Add test for live stream. Remove no longer
reachable test.

youtube_dl/extractor/ceskatelevize.py

@@ -33,14 +33,13 @@ class CeskaTelevizeIE(InfoExtractor):
             'skip_download': True,
         },
     }, {
-        'url': 'http://www.ceskatelevize.cz/ivysilani/10532695142-prvni-republika/bonus/14716-zpevacka-z-duparny-bobina',
+        # live stream
+        'url': 'http://www.ceskatelevize.cz/ivysilani/zive/ct4/',
         'info_dict': {
-            'id': '61924494876844374',
+            'id': 402,
             'ext': 'mp4',
-            'title': 'První republika: Zpěvačka z Dupárny Bobina',
-            'description': 'Sága mapující atmosféru první republiky od r. 1918 do r. 1945.',
-            'thumbnail': 're:^https?://.*\.jpg',
-            'duration': 88.4,
+            'title': 're:ČT Sport.*',
+            'is_live': True,
         },
         'params': {
             # m3u8 download
@@ -118,19 +117,21 @@ def _real_extract(self, url):
         req = sanitized_Request(compat_urllib_parse_unquote(playlist_url))
         req.add_header('Referer', url)
 
-        playlist_title = self._og_search_title(webpage)
-        playlist_description = self._og_search_description(webpage)
+        playlist_title = self._og_search_title(webpage, default=None)
+        playlist_description = self._og_search_description(webpage, default=None)
 
         playlist = self._download_json(req, playlist_id)['playlist']
         playlist_len = len(playlist)
 
         entries = []
         for item in playlist:
+            is_live = item['type'] == 'LIVE'
             formats = []
             for format_id, stream_url in item['streamUrls'].items():
                 formats.extend(self._extract_m3u8_formats(
                     stream_url, playlist_id, 'mp4',
-                    entry_protocol='m3u8_native', fatal=False))
+                    entry_protocol='m3u8' if is_live else 'm3u8_native',
+                    fatal=False))
             self._sort_formats(formats)
 
             item_id = item.get('id') or item['assetId']
@@ -145,14 +146,28 @@ def _real_extract(self, url):
                 if subs:
                     subtitles = self.extract_subtitles(episode_id, subs)
 
+            if playlist_len == 1:
+                if is_live:
+                    # live streams has channel name in title
+                    final_title = self._live_title(title)
+                elif playlist_title:
+                    # title is always set (no KeyError caught)
+                    # and gives good fallback
+                    final_title = title
+                else:
+                    final_title = playlist_title
+            else:
+                final_title = '%s (%s)' % (playlist_title, title)
+
             entries.append({
                 'id': item_id,
-                'title': playlist_title if playlist_len == 1 else '%s (%s)' % (playlist_title, title),
+                'title': final_title,
                 'description': playlist_description if playlist_len == 1 else None,
                 'thumbnail': thumbnail,
                 'duration': duration,
                 'formats': formats,
                 'subtitles': subtitles,
+                'is_live': is_live,
             })
 
         return self.playlist_result(entries, playlist_id, playlist_title, playlist_description)