openRTSP: 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/openRTSP - from package: livemedia-utils

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

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