find broken video files

#!/bin/bash

mkcheck () {
        tmp=$(mktemp)
        ffmpeg -v error -threads 1 -i "${1}" -f null - 2>"${tmp}"
        errors=$(grep -E -i 'error|invalid|illegal|damage' "${tmp}" | wc -l)
        if [[ $errors -ge "1" ]]; then
                echo "File ${1} is BROKEN!!!"
        fi
        rm "${tmp}"
}

export -f mkcheck

find . -type f \( -iname "*.avi" -o -iname "*.mkv" -o -iname "*.mp4" -o -iname "*.mp*g" -o -iname "*.mov" -o -iname "*.3gp"  \) -print0 | parallel -0 mkcheck