[generic] Allow further processing of json_ld URL

Closes #2578

yt_dlp/extractor/common.py

@@ -1447,7 +1447,7 @@ class InfoExtractor(object):
                 'title': part.get('name'),
                 'start_time': part.get('startOffset'),
                 'end_time': part.get('endOffset'),
-            } for part in e.get('hasPart', []) if part.get('@type') == 'Clip']
+            } for part in variadic(e.get('hasPart') or []) if part.get('@type') == 'Clip']
             for idx, (last_c, current_c, next_c) in enumerate(zip(
                     [{'end_time': 0}] + chapters, chapters, chapters[1:])):
                 current_c['end_time'] = current_c['end_time'] or next_c['start_time']

yt_dlp/extractor/generic.py

@@ -3815,13 +3815,16 @@ class GenericIE(InfoExtractor):
 
         # Looking for http://schema.org/VideoObject
         json_ld = self._search_json_ld(webpage, video_id, default={})
-        if json_ld.get('url'):
+        if json_ld.get('url') not in (url, None):
             self.report_detected('JSON LD')
-            if determine_ext(json_ld.get('url')) == 'm3u8':
+            if determine_ext(json_ld['url']) == 'm3u8':
                 json_ld['formats'], json_ld['subtitles'] = self._extract_m3u8_formats_and_subtitles(
                     json_ld['url'], video_id, 'mp4')
                 json_ld.pop('url')
                 self._sort_formats(json_ld['formats'])
+            else:
+                json_ld['_type'] = 'url_transparent'
+                json_ld['url'] = smuggle_url(json_ld['url'], {'force_videoid': video_id, 'to_generic': True})
             return merge_dicts(json_ld, info_dict)
 
         def check_video(vurl):