I have now gone full Emby as it gets better with every update and actually surpassed Plex in my opinion.
I love everything about video playback but I am missing a feature for audiobook playback.
I like to listen to audiobooks before I'm going to bed and from time to time I am waking up and my headset needs a charge and I have to find my spot again.
the Android App "Smart AudioBook Player" has a feature that fades the current playback out when your phone doesn't move for 5 minutes (can be set to whatever you choose).
once you shake your phone it aborts the progress. it can easily be activat