zvbi-ntsc-cc: 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/zvbi-ntsc-cc - from package: zvbi

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

On Debian possible default full paths are:

/usr/bin/zvbi-ntsc-cc - from package: zvbi

You may install the required package with command apt-get install {package}

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