docs: Document magic properties

classes/Video.php

@@ -14,7 +14,14 @@ use Symfony\Component\Process\Process;
 /**
  * Extract info about videos.
  *
- * Due to the way youtube-dl, this class can also contain a playlist.
+ * Due to the way youtube-dl behaves, this class can also contain information about a playlist.
+ *
+ * @property-read string $title         Title
+ * @property-read string $protocol      Network protocol (HTTP, RTMP, etc.)
+ * @property-read string $url           File URL
+ * @property-read string $ext           File extension
+ * @property-read string $extractor_key youtube-dl extractor class used
+ * @property-read array  $entries       List of videos (if the object contains information about a playlist)
  */
 class Video
 {
@@ -46,6 +53,13 @@ class Video
      */
     private $password;
 
+    /**
+     * JSON object returned by youtube-dl.
+     *
+     * @var stdClass
+     */
+    private $json;
+
     /**
      * VideoDownload constructor.
      *