[go90] Improve extraction

- add metadata for 'series', 'episode', 'season', 'season_id',
  'season_number', and 'episode_number'
- integrate series title into the title
- extract subtitles  (fallback to `vtt` if the subtitle file type
  detection fails as that is the most likely extension)

youtube_dl/extractor/go90.py

@@ -5,6 +5,7 @@
 
 from .common import InfoExtractor
 from ..utils import (
+    determine_ext,
     int_or_none,
     parse_iso8601,
 )
@@ -18,7 +19,7 @@ class Go90IE(InfoExtractor):
         'info_dict': {
             'id': '84BUqjLpf9D',
             'ext': 'mp4',
-            'title': 'Inside The Utah Coalition Against Pornography Convention',
+            'title': 'Daily VICE - Inside The Utah Coalition Against Pornography Convention',
             'description': 'VICE\'s Karley Sciortino meets with activists who discuss the state\'s strong anti-porn stance. Then, VICE Sports explains NFL contracts.',
             'timestamp': 1491868800,
             'upload_date': '20170411',
@@ -32,11 +33,28 @@ def _real_extract(self, url):
             video_id, headers={
                 'Content-Type': 'application/json; charset=utf-8',
             }, data=b'{"client":"web","device_type":"pc"}')
-        title = video_data['title']
         main_video_asset = video_data['main_video_asset']
 
+        episode_number = int_or_none(video_data.get('episode_number'))
+        series = None
+        season = None
+        season_id = None
+        season_number = None
+        for metadata in video_data.get('__children', {}).get('Item', {}).values():
+            if metadata.get('type') == 'show':
+                series = metadata.get('title')
+            elif metadata.get('type') == 'season':
+                season = metadata.get('title')
+                season_id = metadata.get('id')
+                season_number = int_or_none(metadata.get('season_number'))
+
+        title = episode = video_data.get('title') or series
+        if series and series != title:
+            title = '%s - %s' % (series, title)
+
         thumbnails = []
         formats = []
+        subtitles = {}
         for asset in video_data.get('assets'):
             if asset.get('id') == main_video_asset:
                 for source in asset.get('sources', []):
@@ -70,6 +88,15 @@ def _real_extract(self, url):
                             'height': int_or_none(source.get('height')),
                             'tbr': int_or_none(source.get('bitrate')),
                         })
+
+                for caption in asset.get('caption_metadata', []):
+                    caption_url = caption.get('source_url')
+                    if not caption_url:
+                        continue
+                    subtitles.setdefault(caption.get('language', 'en'), []).append({
+                        'url': caption_url,
+                        'ext': determine_ext(caption_url, 'vtt'),
+                    })
             elif asset.get('type') == 'image':
                 asset_location = asset.get('location')
                 if not asset_location:
@@ -89,4 +116,11 @@ def _real_extract(self, url):
             'description': video_data.get('short_description'),
             'like_count': int_or_none(video_data.get('like_count')),
             'timestamp': parse_iso8601(video_data.get('released_at')),
+            'series': series,
+            'episode': episode,
+            'season': season,
+            'season_id': season_id,
+            'season_number': season_number,
+            'episode_number': episode_number,
+            'subtitles': subtitles,
         }