Info	image/video
rainbow.png original image
h264-yuv420p.mp4 ffmpeg -i rainbow.png -c:v libx264 -pix_fmt yuv420p h264-yuv420p.mp4
h264-yuv420p.pngffmpeg -i h264-yuv420p.mp4 h264-yuv420p.png
rainbow.png
Export h264-yuv420p.mp4 to png in js