[doveman2]

In codec overlay:
omx-h264 means h264 with omxplayer using hardware decode
mmal-h264 means h264 with dvdplayer using hardware decode
ff-h264 means h264 with dvdplayer using software (ffmpeg) decode

So, just disable omxplayer if you want to force dvdplayer.
By default dvdplayer will be used when required (e.g. dvds with menus, alsa audio, or codec with hardware decode support).

Thanks for clarifying that. It's been a while since I setup Gotham and I've forgotten a lot of stuff unfortunately but I'm slowly getting back up to speed