testRTSPClient: 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/testRTSPClient - from package: livemedia-utils

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

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