diff --git a/youtube_dl/extractor/ndr.py b/youtube_dl/extractor/ndr.py
index 9c8bf05af..2447c812e 100644
--- a/youtube_dl/extractor/ndr.py
+++ b/youtube_dl/extractor/ndr.py
@@ -7,6 +7,7 @@ from .common import InfoExtractor
 from ..utils import (
     determine_ext,
     int_or_none,
+    merge_dicts,
     parse_iso8601,
     qualities,
     try_get,
@@ -87,21 +88,25 @@ class NDRIE(NDRBaseIE):
 
     def _extract_embed(self, webpage, display_id):
         embed_url = self._html_search_meta(
-            'embedURL', webpage, 'embed URL', fatal=True)
+            'embedURL', webpage, 'embed URL',
+            default=None) or self._search_regex(
+            r'\bembedUrl["\']\s*:\s*(["\'])(?P<url>(?:(?!\1).)+)\1', webpage,
+            'embed URL', group='url')
         description = self._search_regex(
             r'<p[^>]+itemprop="description">([^<]+)</p>',
             webpage, 'description', default=None) or self._og_search_description(webpage)
         timestamp = parse_iso8601(
             self._search_regex(
                 r'<span[^>]+itemprop="(?:datePublished|uploadDate)"[^>]+content="([^"]+)"',
-                webpage, 'upload date', fatal=False))
-        return {
+                webpage, 'upload date', default=None))
+        info = self._search_json_ld(webpage, display_id, default={})
+        return merge_dicts({
             '_type': 'url_transparent',
             'url': embed_url,
             'display_id': display_id,
             'description': description,
             'timestamp': timestamp,
-        }
+        }, info)
 
 
 class NJoyIE(NDRBaseIE):
diff --git a/youtube_dl/extractor/nhk.py b/youtube_dl/extractor/nhk.py
index d2cbc9f54..de6a707c4 100644
--- a/youtube_dl/extractor/nhk.py
+++ b/youtube_dl/extractor/nhk.py
@@ -6,7 +6,7 @@ from .common import InfoExtractor
 
 
 class NhkVodIE(InfoExtractor):
-    _VALID_URL = r'https?://www3\.nhk\.or\.jp/nhkworld/(?P<lang>[a-z]{2})/ondemand/(?P<type>video|audio)/(?P<id>\d{7}|[a-z]+-\d{8}-\d+)'
+    _VALID_URL = r'https?://www3\.nhk\.or\.jp/nhkworld/(?P<lang>[a-z]{2})/ondemand/(?P<type>video|audio)/(?P<id>\d{7}|[^/]+?-\d{8}-\d+)'
     # Content available only for a limited period of time. Visit
     # https://www3.nhk.or.jp/nhkworld/en/ondemand/ for working samples.
     _TESTS = [{
@@ -30,6 +30,9 @@ class NhkVodIE(InfoExtractor):
     }, {
         'url': 'https://www3.nhk.or.jp/nhkworld/fr/ondemand/audio/plugin-20190404-1/',
         'only_matching': True,
+    }, {
+        'url': 'https://www3.nhk.or.jp/nhkworld/en/ondemand/audio/j_art-20150903-1/',
+        'only_matching': True,
     }]
     _API_URL_TEMPLATE = 'https://api.nhk.or.jp/nhkworld/%sod%slist/v7a/episode/%s/%s/all%s.json'
 
@@ -82,15 +85,9 @@ class NhkVodIE(InfoExtractor):
             audio = episode['audio']
             audio_path = audio['audio']
             info['formats'] = self._extract_m3u8_formats(
-                'https://nhks-vh.akamaihd.net/i%s/master.m3u8' % audio_path,
-                episode_id, 'm4a', m3u8_id='hls', fatal=False)
-            for proto in ('rtmpt', 'rtmp'):
-                info['formats'].append({
-                    'ext': 'flv',
-                    'format_id': proto,
-                    'url': '%s://flv.nhk.or.jp/ondemand/mp4:flv%s' % (proto, audio_path),
-                    'vcodec': 'none',
-                })
+                'https://nhkworld-vh.akamaihd.net/i%s/master.m3u8' % audio_path,
+                episode_id, 'm4a', entry_protocol='m3u8_native',
+                m3u8_id='hls', fatal=False)
             for f in info['formats']:
                 f['language'] = lang
         return info