diff --git a/yt_dlp/extractor/naver.py b/yt_dlp/extractor/naver.py
index acf53c1ff..a6821ba86 100644
--- a/yt_dlp/extractor/naver.py
+++ b/yt_dlp/extractor/naver.py
@@ -40,6 +40,7 @@ def extract_formats(streams, stream_type, query={}):
                 formats.append({
                     'format_id': '%s_%s' % (stream.get('type') or stream_type, dict_get(encoding_option, ('name', 'id'))),
                     'url': stream_url,
+                    'ext': 'mp4',
                     'width': int_or_none(encoding_option.get('width')),
                     'height': int_or_none(encoding_option.get('height')),
                     'vbr': int_or_none(bitrate.get('video')),
@@ -174,7 +175,7 @@ class NaverLiveIE(InfoExtractor):
         'url': 'https://tv.naver.com/l/52010',
         'info_dict': {
             'id': '52010',
-            'ext': 'm3u8',
+            'ext': 'mp4',
             'title': '[LIVE] 뉴스특보 : "수도권 거리두기, 2주간 2단계로 조정"',
             'description': 'md5:df7f0c237a5ed5e786ce5c91efbeaab3',
             'channel_id': 'NTV-ytnnews24-0',
@@ -184,7 +185,7 @@ class NaverLiveIE(InfoExtractor):
         'url': 'https://tv.naver.com/l/51549',
         'info_dict': {
             'id': '51549',
-            'ext': 'm3u8',
+            'ext': 'mp4',
             'title': '연합뉴스TV - 코로나19 뉴스특보',
             'description': 'md5:c655e82091bc21e413f549c0eaccc481',
             'channel_id': 'NTV-yonhapnewstv-0',
@@ -233,7 +234,7 @@ def _extract_video_info(self, video_id, url):
                 continue
 
             formats.extend(self._extract_m3u8_formats(
-                quality.get('url'), video_id, 'm3u8',
+                quality.get('url'), video_id, 'mp4',
                 m3u8_id=quality.get('qualityId'), live=True
             ))
         self._sort_formats(formats)
diff --git a/yt_dlp/extractor/vlive.py b/yt_dlp/extractor/vlive.py
index 681d95902..4340b1d4c 100644
--- a/yt_dlp/extractor/vlive.py
+++ b/yt_dlp/extractor/vlive.py
@@ -86,6 +86,12 @@ class VLiveIE(VLiveBaseIE):
             'creator': "Girl's Day",
             'view_count': int,
             'uploader_id': 'muploader_a',
+            'upload_date': '20150817',
+            'thumbnail': r're:^https?://.*\.(?:jpg|png)$',
+            'timestamp': 1439816449,
+        },
+        'params': {
+            'skip_download': True,
         },
     }, {
         'url': 'http://www.vlive.tv/video/16937',
@@ -97,6 +103,9 @@ class VLiveIE(VLiveBaseIE):
             'view_count': int,
             'subtitles': 'mincount:12',
             'uploader_id': 'muploader_j',
+            'upload_date': '20161112',
+            'thumbnail': r're:^https?://.*\.(?:jpg|png)$',
+            'timestamp': 1478923074,
         },
         'params': {
             'skip_download': True,
@@ -173,6 +182,8 @@ def get_common_fields():
                 'view_count': int_or_none(video.get('playCount')),
                 'like_count': int_or_none(video.get('likeCount')),
                 'comment_count': int_or_none(video.get('commentCount')),
+                'timestamp': int_or_none(video.get('createdAt'), scale=1000),
+                'thumbnail': video.get('thumb'),
             }
 
         video_type = video.get('type')