http://melee-framedata.theshoemaker.de screenshot renaming/converting helper scripts - referenced here: https://github.com/pfirsich/melee-framedata/blob/master/addingGfys.md

createVideos.py

import os
import sys

cmd = 'ffmpeg -r 60 -i "{dirName}/%d.png" -y -c:v libx264 -vf "format=yuv420p" -r 60 "{dirName}.mp4"'

for dirName in os.listdir("."):
    if os.path.isdir(dirName) and (len(sys.argv) <= 1 or dirName in sys.argv[1:]):
        os.system(cmd.format(dirName=dirName))

renameImages.py

import os

def renameDir(dirName, dirItems):
    print(dirName)
    for i, file in enumerate(sorted(dirItems, key=lambda x: os.path.getmtime(os.path.join(dirName, x)))):
        os.rename(os.path.join(dirName, file), os.path.join(dirName, str(i+1) + ".png"))

for dirName in os.listdir("."):
    if os.path.isdir(dirName):
        dirItems = [file for file in os.listdir(dirName) if file.endswith(".png")]
        if any(not file[:-len(".png")].isdigit() for file in dirItems):
            renameDir(dirName, dirItems)