hitomi

#!/bin/sh

if [ "$1" = "" ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
    cat << EOF

    hitomi script
    easily converts part of a video to gif or webm using ffmpeg.

    first give permission to execute:
    chmod +x hitomi.sh

    USAGE:
    ./hitomi.sh start end input_file output_file

    examples:
    ./hitomi.sh 00:12:32 00:15:21 boku_no_pico.mkv boku_no_pico.gif
    ./hitomi.sh 00:03:52.373 00:04:11.532 umaru.mp4 ebina.webm

"The one with the sharper fangs wins. That's what Killing Bites is."

EOF
    exit 0
fi

if [ $# -ne 4 ]; then
    echo "I need 4 arguments."
    echo "type ./hitomi.sh -h or --help, for more information."
    echo
    exit 1
fi

START="$1"
END="$2"
FILE="$3"
OUTPUT="$4"
CUTTED=a."$FILE" #still don't know how to rename files in ffmpeg :(

ffmpeg -ss "$START" -i "$FILE" -to "$END" -c copy -copyts -an -sn "$CUTTED"

if echo "$OUTPUT" | grep ".gif"
then

#blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html
#ffmpeg.org/ffmpeg-filters.html#palettegen

    filters="fps=8,scale=320:-1:flags=lanczos"
    ffmpeg -i "$CUTTED" -vf "$filters,palettegen" -y palette.png
    ffmpeg -i "$CUTTED" -i palette.png -lavfi "$filters [x]; [x][1:v] paletteuse" -gifflags +transdiff -y "$OUTPUT"
    rm palette.png

elif echo "$OUTPUT" | grep ".webm"
then

#trac.ffmpeg.org/wiki/Encode/VP9

    ffmpeg -i "$CUTTED" -c:v libvpx -b:v 600k -pass 1 -speed 4 -f webm "$PWD/null"
    ffmpeg -i "$CUTTED" -c:v libvpx -b:v 600k -pass 2 -speed 1 -vf scale=640:-1 "$OUTPUT"
    rm ffmpeg2pass-0.log "$PWD/null"

else
    echo "something went wrong"
    echo "type ./hitomi.sh -h or --help, for more information."
    echo
    exit 1
fi

rm "$CUTTED"