dirac_RGBtoUYVY: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/dirac_RGBtoUYVY - from package: dirac

You may install the required package with command yum install {package}

Error in other languages:
dirac_RGBtoUYVY: bevel nie gevind nie
dirac_RGBtoUYVY: comandă negăsită
dirac_RGBtoUYVY: comando não encontrado
dirac_RGBtoUYVY: commande introuvable
dirac_RGBtoUYVY: command not found
dirac_RGBtoUYVY: käsku ei ole
dirac_RGBtoUYVY: không tìm thấy lệnh
dirac_RGBtoUYVY: komanda nerasta
dirac_RGBtoUYVY: Kommando nicht gefunden.
dirac_RGBtoUYVY: kommandot finns inte
dirac_RGBtoUYVY: komut yok
dirac_RGBtoUYVY: nie znaleziono polecenia
dirac_RGBtoUYVY: níor aimsíodh an t-ordú
dirac_RGBtoUYVY: no se encontró la orden
dirac_RGBtoUYVY: no s'ha trobat l'ordre
dirac_RGBtoUYVY: opdracht niet gevonden
dirac_RGBtoUYVY: parancs nem található
dirac_RGBtoUYVY: perintah tidak ditemukan
dirac_RGBtoUYVY: príkaz nenájdený
dirac_RGBtoUYVY: příkaz nenalezen
dirac_RGBtoUYVY: команда не найдена
dirac_RGBtoUYVY: командата не е открита
dirac_RGBtoUYVY: 命令找不到
dirac_RGBtoUYVY: コマンドが見つかりません