Simple Bash Script using FFMpeg to convert MP4 files to GIF

convertMP4ToGifs.sh

#!/bin/bash

#Check Dependecies
if ! command -v ffmpeg &> /dev/null
then
    echo "ffmpeg command could not be found. It's a dependency to run this script"
    exit
fi

if ! command -v ffprobe &> /dev/null
then
    echo "ffprobe command could not be found. It's a dependency to run this script"
    exit
fi

if ! command -v jq &> /dev/null
then
    echo "jq command could not be found. It's a dependency to run this script"
    exit
fi

if ! command -v bc &> /dev/null
then
    echo "bc command could not be found. It's a dependency to run this script"
    exit
fi

gifWidth=640
gifHeight=480

#Catch all matches and convert
for inputFile in *.mp4; do

	if [ -f "$inputFile" ]; then

        baseName=${inputFile##*/}
        baseName=${baseName%%.*}
        ext=${inputFile##*.}

        #Video Info from FFProbe
	videoData=`(ffprobe -v error -select_streams v:0 -show_format -show_entries format=size,duration,filename:stream=display_aspect_ratio,width,height,r_frame_rate,bit_rate,codec_name,duration -print_format json $inputFile)`
	width=`(echo $videoData | jq '.["streams"][0]["width"]')`
	height=`(echo $videoData | jq '.["streams"][0]["height"]')`
	aratio=`(echo $videoData | jq '.["streams"][0]["display_aspect_ratio"]')`
	duration=`(echo $videoData | jq '.["streams"][0]["duration"]' | bc)`
	bit_rate=`(echo $videoData | jq '.["streams"][0]["bit_rate"]' | bc)`
	bit_rate_M=`echo $(($bit_rate / 1024))`
	minSize=$([ $width -le $height ] && echo "$gifWidth" || echo "$gifHeight")
        maxSize=$([ $width -le $height ] && echo "$gifHeight" || echo "$gifWidth")

        ffmpeg -i "$inputFile" -filter_complex "[0:v] fps=12,scale=w=$maxSize:h=-1,split [a][b];[a] palettegen=stats_mode=single [p];[b][p] paletteuse=new=1" "$baseName.gif"

	fi

done