compress

#!/usr/bin/env bash
#
# Compress a video file using ffmpeg with libx264 codec
# Usage: compress <video_path>
#
# lib265 was not used because nobody uses it e.g. whatsapp, ...
# It is not universally used like libx264.
#
# Interesting read: https://news.ycombinator.com/item?id=31317989
#
show_help() {
    echo "Compress a video file using ffmpeg with libx264 codec"
    echo "Usage: $(basename "$0") [-h] [-s <speed>] <video_path>"
    echo "  -h  Show this help message"
    echo "  -s  Set compression speed (1-7):"
    echo "      1 - ultrafast"
    echo "      2 - superfast"
    echo "      3 - veryfast (default)"
    echo "      4 - faster"
    echo "      5 - fast"
    echo "      6 - medium"
    echo "      7 - slow"
}

if [ $# -eq 0 ]; then
    show_help
    exit 0
fi

preset="veryfast"

while getopts ":hs:" opt; do
    case ${opt} in
        h )
            show_help
            exit 0
            ;;
        s )
            case ${OPTARG} in
                1) preset="ultrafast" ;;
                2) preset="superfast" ;;
                3) preset="veryfast" ;;
                4) preset="faster" ;;
                5) preset="fast" ;;
                6) preset="medium" ;;
                7) preset="slow" ;;
                *)
                    echo "Invalid preset option: $OPTARG"
                    show_help
                    exit 1
                    ;;
            esac
            ;;
        \? )
            echo "Invalid option: -$OPTARG" 1>&2
            show_help
            exit 1
            ;;
        : )
            echo "Invalid option: -$OPTARG requires an argument" 1>&2
            show_help
            exit 1
            ;;
    esac
done
shift "$((OPTIND -1))"

video_path="$1"

if [[ ! -f "$video_path" ]]; then
    echo "Error: '$video_path' not found."
    exit 1
fi

output_path="${video_path%.*}_compressed.${video_path##*.}"

echo "ffmpeg -i \"$video_path\" -c:v libx264 -preset \"$preset\" -c:a copy \"$output_path\""
ffmpeg -i "$video_path" -c:v libx264 -preset "$preset" -c:a copy "$output_path"

if [[ $? -eq 0 ]]; then
    echo "Compression completed successfully: $output_path"
else
    echo "Error: Compression failed."
    exit 1
fi