Thank you! There’s some good Doug Chiang prequel art out there, but I don’t think there is much sequel art. Films don’t really use concept art to depict scenes anymore.
In case anyone’s interested, I made some alternate Empire and Jedi covers using the theatrical logos:
You should use a program called Handbrake (https://handbrake.fr/downloads.php). It provides a lot of customization for converting between common video and audio formats.