motv: command not found

Have You tried accessing the binary with the full path?

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/motv - from package: xawtv-motv

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