ffmpegで動画の設定チェックする君

check_video_stream.sh

#!/bin/bash

declare -A Opts=([verbose]=0)

function main() {
    declare -i argc=0
    declare -a argv=()

    : 'Parse args' && {
        while (($# > 0))
        do
            case "$1" in
                --help)
                    usage
                    exit 0
                    ;;
                --verbose)
                    OptVerbose=1
                    shift
                    ;;
                --debug)
                    set -x
                    shift
                    ;;
                --*)
                    error "[ERROR] Invalid option '${1}'."
                    usage
                    exit 1
                    ;;
                -*)
                    declare -i match=0
                    if [[ "$1" =~ h ]]; then
                        usage
                        exit 0
                        ((++match))
                    fi
                    if [[ "$1" =~ v ]]; then
                        OptVerbose=1
                        ((++match))
                    fi
                    if [[ "$1" =~ d ]]; then
                        set -x
                        ((++match))
                    fi
                    if [ $match -eq 0 ]; then
                        error "[ERROR] Invalid option '${1}'."
                        usage
                        exit 1
                    fi
                    shift
                    ;;
                *)
                    ((++argc))
                    argv=("${argv[@]}" "$1")
                    shift
                    ;;
            esac
        done
        if [ $argc -ne 1 ]; then
            usage
            exit 1
        fi
    }

    : 'Get video information' && {
        if [ ! -f ${argv[0]} ]; then
            error "[ERROR] '${argv[0]}' not found."
            exit 1
        fi

        : 'metadata' && {
            streams=$(ffprobe ${argv[0]} -show_format -show_streams -print_format json 2>/dev/null | jq '.streams')
            video=$(echo ${streams} | jq 'if .[0].codec_type == "video" then .[0] else null end')
            audio=$(echo ${streams} | jq 'if .[1].codec_type == "audio" then .[1] else null end')
            if [ "$video" = 'null' ]; then
                error '[ERROR] Can not detect video stream.'
                exit 1
            fi
            if [ "$audio" = 'null' ]; then
                error '[ERROR] Can not detect audio stream.'
                exit 1
            fi
        }

        : 'video avarage key frame interval' && {
            tmpfile="$(mktemp "/tmp/${0##*/}.tmp.XXXXXX").${argv[0]##*.}"
            ffmpeg -ss 0 -i ${argv[0]} -t 20 -vcodec copy -acodec copy "$tmpfile" 2>/dev/null
            declare -a timestamps=($(echo `ffprobe -show_frames -select_streams v -print_format json "$tmpfile" 2>/dev/null | jq -r '.frames | map(select( .key_frame == 1)) | .[].best_effort_timestamp_time'`))
            sum=0
            for i in $(seq 1 `expr ${#timestamps[*]} - 1`); do
                sum=$(echo "${sum} + (${timestamps[$i]} - ${timestamps[((--i))]})" | bc)
            done
            avg_key_frame_interval=$(echo "scale=3; $sum / `expr ${#timestamps[*]} - 1`" | bc)
        }
    }

    declare -i errors=0
    : 'Check video' && {
        check 'video codec' "$(echo $video | jq -r '.codec_name')" 'h264'; errors=$(expr $errors + $?)
        check 'video profile' "$(echo $video | jq -r '.profile')" 'Constrained Baseline'; errors=$(expr $errors + $?)
        check 'video level' "$(echo $video | jq -r '.level')" '30'; errors=$(expr $errors + $?)
        check 'video width' "$(echo $video | jq -r '.width')" '640'; errors=$(expr $errors + $?)
        check 'video height' "$(echo $video | jq -r '.height')" '360'; errors=$(expr $errors + $?)
        check 'video SAR' "$(echo $video | jq -r '.sample_aspect_ratio')" '1:1'; errors=$(expr $errors + $?)
        check 'video DAR' "$(echo $video | jq -r '.display_aspect_ratio')" '16:9'; errors=$(expr $errors + $?)
        check 'video fps' "$(echo $video | jq -r '.r_frame_rate')" '30/1'; errors=$(expr $errors + $?)
        check 'video avarage key frame interval' "$avg_key_frame_interval" '1.000'; errors=$(expr $errors + $?)
    }

    : 'Check audio' && {
        check 'audio codec' "$(echo $audio | jq -r '.codec_name')" 'aac'; errors=$(expr $errors + $?)
        check 'audio profile' "$(echo $audio | jq -r '.profile')" 'LC'; errors=$(expr $errors + $?)
    }

    if [ $errors -ne 0 ]; then
        exit 1
    fi
}

function usage() {
    cat <<EOF
Usage: ${0} [options] {filepath}
Options:
    --help, -h      show this message
    --verbose, -v   show details
    --debug, -d     set -x
EOF
}

function check() {
    if [ "$2" = "$3" ]; then
        success "✔ $1: $2"
        return 0
    else
        error "✗ $1: expected '$3' got '$2'"
        return 1
    fi
}

function success() {
    if [ ${Opts['verbose']} -eq 1 ]; then
        echo -e "\033[33;32m${1}\033[0m"
    fi
}

function error() {
    echo -e "\033[33;31m${1}\033[0m" 1>&2
}

main $*