Let Movie only assemble animation (or make a dry run).

[Esteban82]

When I want to test how gmt movie is using ffmpeg to assemble all the frames for a movie, I need to run gmt movie from the scratch. This means that all the frames are created again and this could take a lot of time.

So, it would good to have a option to just ask gmt movie to assemble the images directly. There is now an option to only create the frames (-Fpng).

I think that an alternative would be to let movie to make a dry run so I could see the ffpmeg command in the terminal.