I have a directory full of images following the pattern , where represents milliseconds elapsed since the fi
Appears your images are non standard frame rate...One option would be to duplicate the appropriate image "once per millisecond" [i.e. for
file '0.png'
file '97.png'
duplicate file 0.png 96 times, so it becomes 0.png 1.png 2.png etc. (or use symlinks, if on linux).
Then you can combine them using the normal image inputter [with input rate of 1ms/frame]. https://trac.ffmpeg.org/wiki/Create%20a%20video%20slideshow%20from%20images