Revert "feat: Use ffmpeg to cover add instead of mp4art from deprecated mp4v2-utils package"

This reverts commit 72794b6785.

This broke cover art addition for MPEG-4 containers

README.md

@@ -20,6 +20,7 @@ Audible fails for some reason.
 * GNU sed - see above
 * GNU find - see above
 * jq - only if `--use-audible-cli-data` is set or if converting an .aaxc file
+* mp4art used to add cover art to m4a and m4b files. Optional
 * mediainfo used to add additional media tags like narrator. Optional
 
 ## Usage(s)
@@ -218,6 +219,24 @@ brew install grep
 brew install findutils
 ```
 
+#### mp4art/mp4chaps
+_Note: This is an optional dependency._
+
+__Ubuntu, Linux Mint, Debian__
+```
+sudo apt-get update
+sudo apt-get install mp4v2-utils
+```
+__CentOS, RHEL & Fedora__
+```
+# CentOS/RHEL and Fedora users make sure that you have enabled atrpms repository in system. Let’s begin installing FFmpeg as per your operating system.
+yum install mp4v2-utils
+```
+__MacOS__
+```
+brew install mp4v2
+```
+
 #### mediainfo
 _Note: This is an optional dependency._