I finally got around to purchasing the Aliens tables. I rely on the community for wheel, table and backglass media, but it does not appear to be anyone keeping up with DMD videos. so I wrote an AutoHotkey script. It's only semi-automatic in that the attract mode loops vary in length by table. If you want to do it right, you must take the output and edit it so that the loops are at least fairly seamless.
The script captures two minutes duration losslessly to an mkv container. This requires ffmpeg, but if you are using PBXRecorder than you already have an ffmpeg install. Open the output file, dmd.mkv, in a video editor. I use the open-source freeware option, Avidemux. Make your cuts and then encode with the built-in x264 codec using constant rate factor 10 for really good quality.
I have a p2k-style cab so I have some instructions that call the separate, open-source dmd-extensions app to render a mirror of the DMD that is flipped for projection onto my playfield. But this script should be easily adaptable for use with the native FX2 DMD renderer. It just may require some trial and error to determine the right capture parameters so that you don't cut off part of the image.
I've also attached example output for Alien: Isolation. Again this is capturing from dmdext which renders as dots. The vast majority will just comment out the call to run dmdext and just capture from the native DMD window.
Good luck and happy new year!
CapFX2.ahk
dmd.mp4