[zdf] Add chapter extraction (#2198)

Authored by: iw0nderhow

yt_dlp/extractor/zdf.py

@@ -136,18 +136,18 @@ class ZDFBaseIE(InfoExtractor):
 class ZDFIE(ZDFBaseIE):
     _VALID_URL = r'https?://www\.zdf\.de/(?:[^/]+/)*(?P<id>[^/?#&]+)\.html'
     _TESTS = [{
-        # Same as https://www.3sat.de/film/ab-18/10-wochen-sommer-108.html
-        'url': 'https://www.zdf.de/dokumentation/ab-18/10-wochen-sommer-102.html',
-        'md5': '0aff3e7bc72c8813f5e0fae333316a1d',
+        'url': 'https://www.zdf.de/nachrichten/heute-journal/heute-journal-vom-30-12-2021-100.html',
         'info_dict': {
-            'id': '141007_ab18_10wochensommer_film',
+            'id': '211230_sendung_hjo',
             'ext': 'mp4',
-            'title': 'Ab 18! - 10 Wochen Sommer',
-            'description': 'md5:8253f41dc99ce2c3ff892dac2d65fe26',
-            'duration': 2660,
-            'timestamp': 1608604200,
-            'upload_date': '20201222',
-        },
+            'description': 'md5:47dff85977bde9fb8cba9e9c9b929839',
+            'duration': 1890.0,
+            'upload_date': '20211230',
+            'chapters': list,
+            'thumbnail': 'md5:e65f459f741be5455c952cd820eb188e',
+            'title': 'heute journal vom 30.12.2021',
+            'timestamp': 1640897100,
+        }
     }, {
         'url': 'https://www.zdf.de/dokumentation/terra-x/die-magie-der-farben-von-koenigspurpur-und-jeansblau-100.html',
         'info_dict': {
@@ -158,6 +158,7 @@ class ZDFIE(ZDFBaseIE):
             'duration': 2615,
             'timestamp': 1465021200,
             'upload_date': '20160604',
+            'thumbnail': 'https://www.zdf.de/assets/mauve-im-labor-100~768x432?cb=1464909117806',
         },
     }, {
         'url': 'https://www.zdf.de/funk/druck-11790/funk-alles-ist-verzaubert-102.html',
@@ -169,7 +170,8 @@ class ZDFIE(ZDFBaseIE):
             'description': 'Die Neue an der Schule verdreht Ismail den Kopf.',
             'title': 'Alles ist verzaubert',
             'timestamp': 1635520560,
-            'upload_date': '20211029'
+            'upload_date': '20211029',
+            'thumbnail': 'https://www.zdf.de/assets/teaser-funk-alles-ist-verzaubert-100~1920x1080?cb=1636466431799',
         },
     }, {
         # Same as https://www.phoenix.de/sendungen/dokumentationen/gesten-der-maechtigen-i-a-89468.html?ref=suche
@@ -196,6 +198,10 @@ class ZDFIE(ZDFBaseIE):
         # Same as https://www.phoenix.de/sendungen/ereignisse/corona-nachgehakt/wohin-fuehrt-der-protest-in-der-pandemie-a-2050630.html
         'url': 'https://www.zdf.de/politik/phoenix-sendungen/wohin-fuehrt-der-protest-in-der-pandemie-100.html',
         'only_matching': True
+    }, {
+        # Same as https://www.3sat.de/film/ab-18/10-wochen-sommer-108.html
+        'url': 'https://www.zdf.de/dokumentation/ab-18/10-wochen-sommer-102.html',
+        'only_matching': True
     }]
 
     def _extract_entry(self, url, player, content, video_id):
@@ -234,12 +240,21 @@ class ZDFIE(ZDFBaseIE):
                     })
                 thumbnails.append(thumbnail)
 
+        chapter_marks = t.get('streamAnchorTag') or []
+        chapter_marks.append({'anchorOffset': int_or_none(t.get('duration'))})
+        chapters = [{
+            'start_time': chap.get('anchorOffset'),
+            'end_time': next_chap.get('anchorOffset'),
+            'title': chap.get('anchorLabel')
+        } for chap, next_chap in zip(chapter_marks, chapter_marks[1:])]
+
         return merge_dicts(info, {
             'title': title,
             'description': content.get('leadParagraph') or content.get('teasertext'),
             'duration': int_or_none(t.get('duration')),
             'timestamp': unified_timestamp(content.get('editorialDate')),
             'thumbnails': thumbnails,
+            'chapters': chapters or None
         })
 
     def _extract_regular(self, url, player, video_id):