convert telegram video sticker (webm) to animated gif

tgvs-to-gif.sh

#!/usr/bin/env sh

find . -name '*.webm' -type f -print0 | xargs -0 -I'{}' -n 1 -- bash -c 'ffmpeg -y -loglevel warning -c:v libvpx-vp9 -i "$0" "${0%.*}.webp"' '{}'
gimp -d -f -n -i -b '(define (webp->gif filename) (let* ((image (car (file-webp-load RUN-NONINTERACTIVE filename filename))) (drawable (car (gimp-image-get-active-layer image))) (new-filename (string-append (substring filename 0 (- (string-length filename) 5)) ".gif"))) (gimp-image-convert-indexed image CONVERT-DITHER-NONE CONVERT-PALETTE-GENERATE 255 FALSE TRUE "") (file-gif-save RUN-NONINTERACTIVE image drawable new-filename new-filename FALSE TRUE 0 2) (gimp-image-delete image))) (define (batch-webp->gif pattern) (let* ((filelist (cadr (file-glob pattern 1)))) (for-each webp->gif filelist))) (batch-webp->gif "*.webp")' -b '(gimp-quit 0)'