rtpfeed: 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 Debian possible default full paths are:

/usr/bin/rtpfeed - from package: dvbstream

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

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