youtube-dl support for https://pac-12.com.

Generally works on pages that have a free video, though in this commit
getting the description sometimes fails.  Does not work on the pages
that require a TV provider login.

youtube_dl/extractor/extractors.py

@@ -822,6 +822,7 @@ from .orf import (
     ORFIPTVIE,
 )
 from .outsidetv import OutsideTVIE
+from .pac12 import Pac12IE
 from .packtpub import (
     PacktPubIE,
     PacktPubCourseIE,

youtube_dl/extractor/pac12.py

@@ -0,0 +1,48 @@
+# coding: utf-8
+from __future__ import unicode_literals
+
+import re
+
+from .common import InfoExtractor
+
+
+class Pac12IE(InfoExtractor):
+    _VALID_URL = r'https?://(?:[a-z]+\.)?pac-12.com/(?:embed/)?(?P<id>.*)'
+
+    _TEST = {
+        'url': 'https://pac-12.com/videos/2020-pac-12-womens-basketball-media-day-arizona-cal-stanford',
+        'md5': 'b2e3c0cb99458c8b8e2dc22cb5ac922d',
+        'info_dict': {
+            'id': 'vod-VGQNKGlo9Go',
+            'ext': 'mp4',
+            'title': '2020 Pac-12 Women\'s Basketball Media Day - Arizona, Cal & Stanford | Pac-12',
+            'description': 'During the 2020 Pac-12 Women\'s Basketball Media Day, Ros Gold-Onwude moderates a discussion with Arizona\'s Adia Barnes & Aari McDonald, Cal\'s Charmin Smith & Evelien Lutje Schipholt & Stanford\'s Tara VanDerveer & Kiana Williams.',
+        }
+    }
+
+    def _real_extract(self, url):
+        video_id = self._match_id(url)
+        webpage = self._download_webpage(url, video_id)
+        video_url = \
+            self._search_regex(r'"manifest_url":"(?P<url>https:[^"]+)"',
+                               webpage, 'url', group='url', default=None)
+        vod_url = None
+        if (video_url is None) or ('vod-' not in url):
+            vod_url = self._search_regex(r'(https?://(?:embed\.)?pac-12\.com/(?:embed/)?vod-[0-9a-zA-Z]+)',
+                                         webpage, 'url', default=None)
+        if video_url is None:
+            if vod_url is None:
+                return None
+            return self.url_result(vod_url)
+        video_url = re.sub(r'\\', '', video_url)
+        title = self._html_search_regex(r'<title>(.+?)</title>', 
+                                        webpage, 'title')
+        if 'vod-' not in url and vod_url is not None:
+            video_id = self._match_id(vod_url)
+        return {
+            'id': video_id,
+            'title': title,
+            'description': self._og_search_description(webpage),
+            'url': video_url,
+            'ext': 'mp4',
+        }