RVIO Pull first frame from .mov

Hi, I’m using a simple command (as listed in the rvio --help):

rvio in.mov -t 1054-1054 -o out.#.jpg

Is it possible to substitute this to always pull the first frame (or second, or last) regardless of the frame range of the .mov? For example, the .mov may start at 1054 or 2021 or 3001. I want to put -t FirstFrame instead of the exact frame per .mov.