testH264VideoStreamer: 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/testH264VideoStreamer - from package: livemedia-utils

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

Error in other languages:
testH264VideoStreamer: bevel nie gevind nie
testH264VideoStreamer: comandă negăsită
testH264VideoStreamer: comando não encontrado
testH264VideoStreamer: commande introuvable
testH264VideoStreamer: command not found
testH264VideoStreamer: käsku ei ole
testH264VideoStreamer: không tìm thấy lệnh
testH264VideoStreamer: komanda nerasta
testH264VideoStreamer: Kommando nicht gefunden.
testH264VideoStreamer: kommandot finns inte
testH264VideoStreamer: komut yok
testH264VideoStreamer: nie znaleziono polecenia
testH264VideoStreamer: níor aimsíodh an t-ordú
testH264VideoStreamer: no se encontró la orden
testH264VideoStreamer: no s'ha trobat l'ordre
testH264VideoStreamer: opdracht niet gevonden
testH264VideoStreamer: parancs nem található
testH264VideoStreamer: perintah tidak ditemukan
testH264VideoStreamer: príkaz nenájdený
testH264VideoStreamer: příkaz nenalezen
testH264VideoStreamer: команда не найдена
testH264VideoStreamer: командата не е открита
testH264VideoStreamer: 命令找不到
testH264VideoStreamer: コマンドが見つかりません