diff --git a/wp-includes/ID3/getid3.php b/wp-includes/ID3/getid3.php
index 178c7cc1af..cb25253e22 100644
--- a/wp-includes/ID3/getid3.php
+++ b/wp-includes/ID3/getid3.php
@@ -250,7 +250,7 @@ class getID3
 	 */
 	protected $startup_warning = '';
 
-	const VERSION           = '1.9.17-201907240906';
+	const VERSION           = '1.9.18-201907240906';
 	const FREAD_BUFFER_SIZE = 32768;
 
 	const ATTACHMENTS_NONE   = false;
diff --git a/wp-includes/ID3/module.audio-video.matroska.php b/wp-includes/ID3/module.audio-video.matroska.php
index b2b187b6f1..5999066218 100644
--- a/wp-includes/ID3/module.audio-video.matroska.php
+++ b/wp-includes/ID3/module.audio-video.matroska.php
@@ -342,7 +342,7 @@ class getid3_matroska extends getid3_handler
 						switch ($trackarray['CodecID']) {
 							case 'A_PCM/INT/LIT':
 							case 'A_PCM/INT/BIG':
-								$track_info['bitrate'] = $trackarray['SamplingFrequency'] * $trackarray['Channels'] * $trackarray['BitDepth'];
+								$track_info['bitrate'] = $track_info['sample_rate'] * $track_info['channels'] * $trackarray['BitDepth'];
 								break;
 
 							case 'A_AC3':
diff --git a/wp-includes/version.php b/wp-includes/version.php
index f597291df3..8ef3817ef5 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-46165';
+$wp_version = '5.3-alpha-46166';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.