Example of Custom Arguments

[sfnzr6]

I'm sorry if I am dumb D: I am looking for a way to force 10 FPS for converting from GIF to MP4, but am having trouble figuring out how to use Custom Arguments. I realize that it uses ffmpeg syntax, but I've tried various combinations of this and am not sure. The Help just takes me to the ffmpeg documentation page, but if I just use a straight example from there, it does not work. I assume I need to use the (p)(f) for the file path and name, but have tried adding this with no success. Any help or examples would be greatly appreciated! Thank you!!!! :)