current position as frame number - and copy it

[zimbot]

Firends,

can smplayer show the current play head position in frames? and can that num be copied ( and later pasted )?

I am looking for a way that I can
1- load a 30 min video
2. build a text file that looks something like this
FileName.txt

filename frameNumber frameNumber
filename frameNumber frameNumber
filename frameNumber frameNumber

This would be IN & OUT of a sub clip.
My real goal is to make a txt file that be fashioned into a ffmpeg script to sub clip the larger org video.

I wonder if it is possible to make a "custom" player interface
that would allow me to build this txt file.

I realize that ffmpeg wishes the nums to be
-ss StartFrameNum and a -t DurationOfFramesNum
but I figure I can just IN - OUT = Duration

I wonder how hard it would be to add this functionality to a open source player - a custom

thanks

Z