Converts gif to web video files (mp4, webm & vp9)

gif2mp4

#!/bin/bash
#

ARGS=()

POSITIONAL=()
while [[ $# -gt 0 ]]
do
key="$1"

## Set ARGUMENTS
if [[ $2 == -* ]]; then
	ARGS+=($1)
else
	ARGS+=($1 $2)
fi

case $key in
	--skip-png)
	skipPNG="true"
	shift
	;;
	--low-quality)
	crf=31
	qmin=16
	qmax=63
	shift
	;;
	--medium-quality)
	crf=18
	qmin=16
	qmax=58
	shift
	;;
	--high-quality)
	crf=6
	qmin=16
	qmax=53
	shift
	;;
	-F|--fast)
	processor="$NUMBER_OF_PROCESSORS"
	shift
	;;
	-crf)
	crf="$2"
	shift
	shift
	;;
	-qmin)
	qmin="$2"
	shift
	shift
	;;
	-qmax)
	qmax="$2"
	shift
	shift
	;;
    -P|--processor)
    processor="$2"
    shift # past argument
    shift # past value
    ;;
    *)    # unknown option
    POSITIONAL+=("$1") # save it in an array for later
    shift # past argument
    ;;
esac
done
set -- "${POSITIONAL[@]}" #


if [ -z "$1" ]; then
	find -maxdepth 1 \( -iname '*.gif' \)  -print0 | xargs -0 -I{} basename {} | xargs -I{} -P${processor-$NUMBER_OF_PROCESSORS} gif2mp4 "${ARGS[@]}" "{}"
else
	filename=$(basename -- "$1")
	EXT="${filename##*.}"
	FILENAME="${filename%.*}"

	ffmpeg -y -f gif -i $1 \
		-vcodec libx264    -pix_fmt yuv420p -b:v 0 -crf ${crf-18} -qmin ${qmin-16} -qmax ${qmax-63} -vf "fps=30,scale=trunc(iw/2)*2:trunc(ih/2)*2" -an $FILENAME.mp4 \
		-vcodec libvpx-vp9 -pix_fmt yuv420p -b:v 0 -crf ${crf-18} -qmin ${qmin-16} -qmax ${qmax-63} -vf "fps=30,scale=trunc(iw/2)*2:trunc(ih/2)*2" -an $FILENAME-vp9.webm \
		-vcodec libvpx     -pix_fmt yuv420p -b:v 0 -crf ${crf-18} -qmin ${qmin-16} -qmax ${qmax-63} -vf "fps=30,scale=trunc(iw/2)*2:trunc(ih/2)*2" -an $FILENAME.webm

fi