diff --git a/youtube_dl/extractor/nbc.py b/youtube_dl/extractor/nbc.py
index 9dc8f9ebc..1b1722cfa 100644
--- a/youtube_dl/extractor/nbc.py
+++ b/youtube_dl/extractor/nbc.py
@@ -9,6 +9,7 @@ from .adobepass import AdobePassIE
 from ..utils import (
     find_xpath_attr,
     smuggle_url,
+    try_get,
     unescapeHTML,
     update_url_query,
     int_or_none,
@@ -78,10 +79,14 @@ class NBCIE(AdobePassIE):
     def _real_extract(self, url):
         permalink, video_id = re.match(self._VALID_URL, url).groups()
         permalink = 'http' + permalink
-        video_data = self._download_json(
+        response = self._download_json(
             'https://api.nbc.com/v3/videos', video_id, query={
                 'filter[permalink]': permalink,
-            })['data'][0]['attributes']
+                'fields[videos]': 'description,entitlement,episodeNumber,guid,keywords,seasonNumber,title,vChipRating',
+                'fields[shows]': 'shortTitle',
+                'include': 'show.shortTitle',
+            })
+        video_data = response['data'][0]['attributes']
         query = {
             'mbr': 'true',
             'manifest': 'm3u',
@@ -103,10 +108,11 @@ class NBCIE(AdobePassIE):
             'title': title,
             'url': theplatform_url,
             'description': video_data.get('description'),
-            'keywords': video_data.get('keywords'),
+            'tags': video_data.get('keywords'),
             'season_number': int_or_none(video_data.get('seasonNumber')),
             'episode_number': int_or_none(video_data.get('episodeNumber')),
-            'series': video_data.get('showName'),
+            'episode': title,
+            'series': try_get(response, lambda x: x['included'][0]['attributes']['shortTitle']),
             'ie_key': 'ThePlatform',
         }
 
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 04aeb91af..7f4298c08 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -1537,7 +1537,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
             ytplayer_config = self._get_ytplayer_config(video_id, video_webpage)
             if ytplayer_config:
                 args = ytplayer_config['args']
-                if args.get('url_encoded_fmt_stream_map'):
+                if args.get('url_encoded_fmt_stream_map') or args.get('hlsvp'):
                     # Convert to the same format returned by compat_parse_qs
                     video_info = dict((k, [v]) for k, v in args.items())
                     add_dash_mpd(video_info)
@@ -1697,9 +1697,11 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         self.report_information_extraction(video_id)
 
         # uploader
-        if 'author' not in video_info:
-            raise ExtractorError('Unable to extract uploader name')
-        video_uploader = compat_urllib_parse_unquote_plus(video_info['author'][0])
+        video_uploader = try_get(video_info, lambda x: x['author'][0], compat_str)
+        if video_uploader:
+            video_uploader = compat_urllib_parse_unquote_plus(video_uploader)
+        else:
+            self._downloader.report_warning('unable to extract uploader name')
 
         # uploader_id
         video_uploader_id = None
@@ -1813,6 +1815,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
 
         chapters = self._extract_chapters(description_original, video_duration)
 
+        def _extract_filesize(media_url):
+            return int_or_none(self._search_regex(
+                r'\bclen[=/](\d+)', media_url, 'filesize', default=None))
+
         if 'conn' in video_info and video_info['conn'][0].startswith('rtmp'):
             self.report_rtmp_download()
             formats = [{
@@ -1917,8 +1923,11 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                 mobj = re.search(r'^(?P<width>\d+)[xX](?P<height>\d+)$', url_data.get('size', [''])[0])
                 width, height = (int(mobj.group('width')), int(mobj.group('height'))) if mobj else (None, None)
 
+                filesize = int_or_none(url_data.get(
+                    'clen', [None])[0]) or _extract_filesize(url)
+
                 more_fields = {
-                    'filesize': int_or_none(url_data.get('clen', [None])[0]),
+                    'filesize': filesize,
                     'tbr': float_or_none(url_data.get('bitrate', [None])[0], 1000),
                     'width': width,
                     'height': height,
@@ -1969,9 +1978,11 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                 a_format.setdefault('http_headers', {})['Youtubedl-no-compression'] = 'True'
                 formats.append(a_format)
         else:
-            unavailable_message = extract_unavailable_message()
-            if unavailable_message:
-                raise ExtractorError(unavailable_message, expected=True)
+            error_message = clean_html(video_info.get('reason', [None])[0])
+            if not error_message:
+                error_message = extract_unavailable_message()
+            if error_message:
+                raise ExtractorError(error_message, expected=True)
             raise ExtractorError('no conn, hlsvp or url_encoded_fmt_stream_map information found in video info')
 
         # Look for the DASH manifest
@@ -1990,6 +2001,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                     for df in self._extract_mpd_formats(
                             mpd_url, video_id, fatal=dash_mpd_fatal,
                             formats_dict=self._formats):
+                        if not df.get('filesize'):
+                            df['filesize'] = _extract_filesize(df['url'])
                         # Do not overwrite DASH format found in some previous DASH manifest
                         if df['format_id'] not in dash_formats:
                             dash_formats[df['format_id']] = df
diff --git a/youtube_dl/options.py b/youtube_dl/options.py
index f3f8f23b6..b692c6b3b 100644
--- a/youtube_dl/options.py
+++ b/youtube_dl/options.py
@@ -232,7 +232,7 @@ def parseOpts(overrideArguments=None):
         '--geo-verification-proxy',
         dest='geo_verification_proxy', default=None, metavar='URL',
         help='Use this proxy to verify the IP address for some geo-restricted sites. '
-        'The default proxy specified by --proxy (or none, if the options is not present) is used for the actual downloading.')
+        'The default proxy specified by --proxy (or none, if the option is not present) is used for the actual downloading.')
     geo.add_option(
         '--cn-verification-proxy',
         dest='cn_verification_proxy', default=None, metavar='URL',