Use ffmpeg for audiobook conversion

pages/04.other/media-ripping/audiobook-ripping/default.en.md

@@ -7,5 +7,20 @@ visible: true
 
 ## Audible
 
-### Libation
-> [Libation](https://github.com/rmcrackan/Libation)
+1. Get your Audible activation data
+2. Convert the downloaded `.aax` file
+
+### Audible activation data
+Multiple possible ways exist to extract activation data from Audible `.aax`-files  
+
+The simples way is just using [this AAX checksum resolver](https://audible-tools.kamsker.at/)  
+Alternatively [audible-activator](https://github.com/inAudible-NG/audible-activator) can be used as well  
+
+### Convert AAX file
+Using `ffmpeg` and the activation bytes, a file can easily be convertet to `m4b`  
+
+[shuser]
+```sh
+ffmpeg -activation_bytes [XXXXXXXX] -i [Audiobook].aax -c copy [Audiobook].m4b
+```
+[/shuser]