Chuckame

# With ffmpeg installed :
for f in *.mkv ; do ffmpeg -hide_banner -i "$f" -map 0 -c:v copy -c:a ac3 -c:s copy "${f%.mkv}.AC3.mkv" ; done

# Without ffmpeg installed
for f in *.mkv ; do docker run --rm -v multimedia-series:/temp/ jrottenberg/ffmpeg:4.1-scratch -stats -hide_banner -i /temp/"$f" -map 0 -c:v copy -c:a ac3 -c:s copy /temp/"${f%.mkv}.AC3.mkv" ; done

Chuckame

<?php
/*******************************************************************
* Glype is copyright and trademark 2007-2013 UpsideOut, Inc. d/b/a Glype
* and/or its licensors, successors and assigners. All rights reserved.
*
* Use of Glype is subject to the terms of the Software License Agreement.
* http://www.glype.com/license.php
******************************************************************/

define('high_quality', true);