Reset current game frame

Hey everyone!

I'm working on this project that outputs a video and a text file that contains information about said video.

Once I start I have a few random seconds until the video starts and once it does I would like to reset the current frame to 0 so that it meets the frame of the video from that point onwards.

I tried with Time.framecount and though it is what I need, I cannot reset it to zero at my whim (I tried to even subtract the Time.framecount from itself to get 0 but it stays 0 for a moment and then goes all the way up to the current frame).

What alternative can I use for this? I've been looking online but I didn't find any specifics that could aid me in this.