dirac_UYVYtoRGB: 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_UYVYtoRGB - from package: dirac

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

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