#!/bin/bash

#by thimios katsoulis 20190619 -- https://www.facebook.com/thimios.katsoulis ; 

# a LINUX script to create  gif from video

# uses ffmpeg , convert

if [ $# -lt 3 ]

then

echo "Usage is: `basename $0` <video> <start_time>  <duration> <width> <video_interval> <gif_interval>  "

echo "E.g. :  `basename $0` v.mp4 01:19:13.800 00:00:03.100"

exit 1

fi

echo "--- converting to gif from  $1 ---------"

video=$1

start_time=$2

duration=$3

#optional parameters 

#width

width=${4:-500}

#video_interval

video_interval=${5:-10}

#gif_interval

gif_interval=`expr $video_interval + 10`

gif_interval=${6:-$gif_interval}

printf "Going to make a gif from video: $video \nStart time : $start_time \nDuration:$duration \nSnapshot interval: $video_interval milliseconds\nGif delay: $gif_interval \n" 

read -p "Press enter to continue.." 

fnamevideo=`basename $video`

frames_dir="/tmp/"$fnamevideo"_frames"

mkdir -p $frames_dir

rm -f $frames_dir/*

echo "Cutting video.."

ffmpeg -loglevel panic -i $video -ss "$start_time" -t "$duration" -c copy $frames_dir/$fnamevideo

echo "Extracting images from cutted video.."

ffmpeg -loglevel panic  -i $frames_dir/$fnamevideo -r $video_interval $frames_dir/image-%3d.png

echo "Compressing images.."

pngs=`ls $frames_dir/*png`

pngsLen=`ls $frames_dir/*png|wc -l`

i=0

for im in `ls $frames_dir/*png`

do

i=`expr $i + 1`

echo "$i of $pngsLen" 

convert  $im -resize $width  $im

done

 

echo "Now is the time to delete any unwanted photos in $frames_dir.. "

read -p "When You are ready , Press enter to continue " yn

echo "Making gif : $fnamevideo.gif .."

convert -delay $gif_interval -loop 0 $frames_dir/*.png $fnamevideo.gif

echo "Done"