Convert a video to gif (webm/mp4)

video2gif.sh

#!/bin/bash
#
inputFile=$1

FPS=15
WIDTH=$2

OUTPUT='output.gif';
PALETTE_OUTPUT='tmp_palette.png';

#
#  Convert mp4/webm to gif original or custom size
#  Usage:
#       ./convert.sh <fileName>.<ext> <size>
#  Output file = ./output.gif
#
#

if [[ "$inputFile" == *.webm ]]
then
  ffmpeg -threads 4 -y -i "$inputFile" -vf palettegen "$PALETTE_OUTPUT"
  ffmpeg -threads 4 -y -i "$inputFile" -i "$PALETTE_OUTPUT" -filter_complex "fps=$FPS,scale=$WIDTH:-1:flags=lanczos[x];[x][1:v]paletteuse" -r 10 $OUTPUT


else

  #Generate palette for better quality
  ffmpeg -threads 4 -i "$inputFile" -vf fps=$FPS,scale=$WIDTH:-1:flags=lanczos,palettegen "$PALETTE_OUTPUT" -threads 4

  #Generate gif using palette
  ffmpeg -threads 4 -i "$inputFile" -i "$PALETTE_OUTPUT" -loop 0 -filter_complex "fps=$FPS,scale=$WIDTH:-1:flags=lanczos[x];[x][1:v]paletteuse" $OUTPUT

fi;

rm "$PALETTE_OUTPUT"