live555MediaServer: 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/live555MediaServer - from package: livemedia-utils

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

Error in other languages:
live555MediaServer: bevel nie gevind nie
live555MediaServer: comandă negăsită
live555MediaServer: comando não encontrado
live555MediaServer: commande introuvable
live555MediaServer: command not found
live555MediaServer: käsku ei ole
live555MediaServer: không tìm thấy lệnh
live555MediaServer: komanda nerasta
live555MediaServer: Kommando nicht gefunden.
live555MediaServer: kommandot finns inte
live555MediaServer: komut yok
live555MediaServer: nie znaleziono polecenia
live555MediaServer: níor aimsíodh an t-ordú
live555MediaServer: no se encontró la orden
live555MediaServer: no s'ha trobat l'ordre
live555MediaServer: opdracht niet gevonden
live555MediaServer: parancs nem található
live555MediaServer: perintah tidak ditemukan
live555MediaServer: príkaz nenájdený
live555MediaServer: příkaz nenalezen
live555MediaServer: команда не найдена
live555MediaServer: командата не е открита
live555MediaServer: 命令找不到
live555MediaServer: コマンドが見つかりません