I have the following script in a button and it works great:
for /R %%A IN (*.mp4 *.avi *.mkv *.m4v) DO ffmpeg -i "%%A" -vf "select=gte(n,2500)" -vframes 1 "%%~nA.jpg"
This will make a video still of every video file in the current folder. I would like to modify it so that it will only work on my selected files rather than every file in the current directory.