windows – ffmpeg convert images in a folder with no defined start number

I’m setting up a batch file to daily convert a folder of screen captures to video.

I can specify the filename of the screen caps, but I can’t get it to reset each day, so say 2 might start at 03213. Without renaming the files is a way to either

1. get ffmepg to find the start number and go to the oldest newest file or
2. read the start and end file names in the batch file and plug that into the ffmpeg command?

this is my current command:

ffmpeg.exe -f image2 -framerate 25 -pattern_type sequence -start_number 00001 -i "Y:\ft\!new_folder!\%%05d.jpg" -c:v libx265 -b:v 5000k -g 100 "Y:\ft\!new_folder!.mp4"