It's actually super simple, just download ffmpeg from
You must be registered to see the links
and then open a command window in the folder where you have your rendered images (if you don't know how to do this: press the windows key and the R key and type
cmd
into the window that appears and then type
cd "C:\path\to\where\your\images\are"
).
Then you can execute ffmpeg to make a video with this command:
C:\path\to\ffmpeg.exe -i img%03d.png -c:v libx264 -vf fps=30 -pix_fmt yuv420p out.mp4
(more information
You must be registered to see the links
).
This command expects the files being named img000.png, img001.png and so on, if your names are different you can adjust the file name in the command.