Extract Frames

You can extract frames from an animated webp file with this command:

magick input.webp -coalesce -define webp:lossless=true ./frames/frame-%03d.webp

Create Animation

ffmpeg can be used to create webp animations. Example:

ffmpeg -i frame-%03d.webp -c:v libwebp_anim -lossless 1 -framerate 29.970 anim.webp

-start_number 1 can be used to change the starting frame. This option goes before the -iinput.