if you need to make your own in a pinch, will work on linux and osx, should work on windows (not tested):
ffmpeg -framerate 30 -f image2 -i <jpg|jpeg|png-c:v libx264 -pix_fmt yuva420p output.mp4
Note: you'll want to strip the metadata from the resultant .mp4 with exiftool, otherwise one can observe the muxer/encoder and its' version.