Gmencoder is a software that acts as a user interface for mencoder, on the GNOME 2 desktop environment.
To use Gmencoder, you'll need to have Linux, but it should also work on other Unix systems. If you're looking for a GUI program, then this is the perfect solution for you because it's incredibly easy to use. You'll need to analyze the source file before you can fill in the scaling, cropping, subtitle, or post-processing options. Just make sure to press "Analyze File" or "Analyze DVD" before you start editing because these options are not sensitive to the mouse.
Overall, Gmencoder is a fantastic software that does the job well, and it's definitely worth trying out. If you have any feedback or suggestions, the developers would love to hear from you, so don't hesitate to let them know.
Version 0.1.0: N/A