--- /dev/null
+<?php
+
+namespace Drupal\metatag_twitter_cards\Plugin\metatag\Tag;
+
+use Drupal\metatag\Plugin\metatag\Tag\MetaNameBase;
+
+/**
+ * The Twitter Cards player stream content-type metatag.
+ *
+ * @MetatagTag(
+ * id = "twitter_cards_player_stream_content_type",
+ * label = @Translation("MP4 media stream MIME-type"),
+ * description = @Translation("The MIME type for the media contained in the stream URL, as defined by <a href=':url'>RFC 4337</a>.", arguments = { ":url" = "http://tools.ietf.org/rfc/rfc4337.txt" }),
+ * name = "twitter:player:stream:content_type",
+ * group = "twitter_cards",
+ * weight = 404,
+ * type = "string",
+ * secure = FALSE,
+ * multiple = FALSE
+ * )
+ */
+class TwitterCardsPlayerStreamContentType extends MetaNameBase {
+}