#gif with text overlay #generator using #ffmpeg - inspired by http://blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html

readme.md

###Simple gif generator with text overlay

This generator was inspired from the nice post for high quality gif with ffmpeg. It's pretty simple and only needs ffmpeg as a prerequisite. You might want to change the fontfile path in line 29 for other fonts though.

gifenc.sh

#!/bin/bash
#parameters: 
#   $1 - mp4 url
#   $2 - start time in format hh:mm:ss.mic
#   $3 - duration in seconds
#   $4 - text for gif overlay
#   $5 - output file without extension
if [ "$#" -ne 5 ]
then
    echo "Usage: gifenc.sh \$1 \$2 \$3 \$4 \$5
parameters: 
	\$1 - mp4 url
	\$2 - start time in format hh:mm:ss.mic
	\$3 - duration in seconds
	\$4 - text for gif overlay
	\$5 - output file without extension"
    exit 1
fi
#temporary mp4 files
tempvideo="$5.mp4"
tempvideo2="$5$3.mp4"
#params for gif creation
palette="$5.png"
filters="fps=15,scale=480:-1:flags=lanczos"
outputfile="$5.gif"
#first cut a small video from start_time of duration seconds from the initial mp4 file
ffmpeg -v warning -ss $2 -t $3 -i $1 -y $tempvideo
#draw text on video
ffmpeg -v warning -i $tempvideo -vf drawtext="fontfile=impact.ttf:text=\'$4\':fontcolor=white:fontsize=40:x=(w-text_w)/2:y=h-text_h-line_h:borderw=2" -c:a copy -y $tempvideo2
#2 step gif generation - http://blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html
ffmpeg -v warning -i $5.mp4 -vf "$filters,palettegen" -y $palette
ffmpeg -v warning -i $tempvideo2 -i $palette -lavfi "$filters [x]; [x][1:v] paletteuse" -y $outputfile
#cleanup
rm "$palette"
rm "$tempvideo"
rm "$tempvideo2"