Download FFMpeg here:
https://sourceforge.net/projects/ffmpeg/files/latest/download
Extract the ZIP file
Place the frames of the video into the folder that FFMpeg is in.
If FFMpeg is not in it's own folder make a new folder and place it and the frames into the new folder.
Go into the folder if you created a new one.
Press Left-Shift+Right-Click in an empty area of the file explorer and there should be now a button that says "Open Powershell Window here"
click that...
Rename each file for the frames to something like pic00.png, pic01.png, etc.
In the powershell window type this and be sure to edit the values in the < and > (be sure to also remove those symbols
.\ffmpeg.exe -r 60 -f image2 -s <video width>x<video height> -i pic%04d.png -vcodec libx264 -crf 25 -pix_fmt yuv420p <video name>.mp4Enjoy~
To convert from gif to video you just need to put the gif into the folder with FFMpeg and open powershell as described in Step 5
and run
.\ffmpeg.exe -r 30 -i <gif name>.gif -movflags faststart -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" <video name>.mp4