animated gif CLI tools

extract-snippet

#!/bin/sh

set -e

if [ "$#" -ne 4 ]; then
    echo Usage:
    echo "\textract-snippet INPUT_FILE OUTPUT_FILE START_TIME DURATION_SECONDS"
    echo "\te.g. extract-snippet full-video.mkv snippet.mkv 00:24:17 5"
    exit 1
fi

input_file=$1
output_file=$2
start_time=$3
duration_seconds=$4

printf "snipping $duration_seconds seconds starting at $start_time of $input_file to $output_file..."

ffmpeg -ss $start_time \
       -t $duration_seconds \
       -i $input_file \
       -c:v copy \
       -map 0:v \
       -y $output_file &> /dev/null

echo " done!"

gif-encode

#!/bin/sh

set -e

if [ "$#" -ne 2 ]; then
    echo Usage:
    echo "\tgif-encode INPUT_FILE OUTPUT_FILE"
    exit 1
fi

palette="/tmp/palette.png"
filters="fps=15,scale=640:-1:flags=lanczos"

ffmpeg -v warning -i $1 -vf "$filters,palettegen" -y $palette
ffmpeg -v warning -i $1 -i $palette -lavfi "$filters [x]; [x][1:v] paletteuse" -y $2

rm $palette