Added -vn flag for audio transcoding to remove video tracks on transcoded audio

Signed-off-by: Andrew Welch <andrew@nystudio107.com>

Author: khalwat

src/services/Transcode.php

@@ -349,7 +349,8 @@ public function getAudioUrl($filePath, $audioOptions): string
                 .' -i '.escapeshellarg($filePath)
                 .' -acodec '.$thisEncoder['audioCodec']
                 .' '.$thisEncoder['audioCodecOptions']
-                .' -bufsize 1000k -vn'
+                .' -bufsize 1000k'
+                .' -vn'
                 .' -threads '.$thisEncoder['threads'];
 
             // Set the bitrate if desired