[instagram] Add support for embed URLs

youtube_dl/extractor/instagram.py

@@ -12,7 +12,7 @@ from ..utils import (
 
 
 class InstagramIE(InfoExtractor):
-    _VALID_URL = r'https?://(?:www\.)?instagram\.com/p/(?P<id>[^/?#&]+)'
+    _VALID_URL = r'(?P<url>https?://(?:www\.)?instagram\.com/p/(?P<id>[^/?#&]+))'
     _TESTS = [{
         'url': 'https://instagram.com/p/aye83DjauH/?foo=bar#abc',
         'md5': '0d2da106a9d2631273e192b372806516',
@@ -38,6 +38,9 @@ class InstagramIE(InfoExtractor):
     }, {
         'url': 'https://instagram.com/p/-Cmh1cukG2/',
         'only_matching': True,
+    }, {
+        'url': 'http://instagram.com/p/9o6LshA7zy/embed/',
+        'only_matching': True,
     }]
 
     @staticmethod
@@ -53,7 +56,9 @@ class InstagramIE(InfoExtractor):
             return mobj.group('link')
 
     def _real_extract(self, url):
-        video_id = self._match_id(url)
+        mobj = re.match(self._VALID_URL, url)
+        video_id = mobj.group('id')
+        url = mobj.group('url')
 
         webpage = self._download_webpage(url, video_id)
         uploader_id = self._search_regex(r'"owner":{"username":"(.+?)"',