test-mpeg2: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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 CentOS possible default full paths are:

/usr/bin/test-mpeg2 - from package: libiec61883-utils

You may install the required package with command yum install {package}
Error in other languages:
test-mpeg2: bevel nie gevind nie
test-mpeg2: comandă negăsită
test-mpeg2: comando não encontrado
test-mpeg2: commande introuvable
test-mpeg2: command not found
test-mpeg2: käsku ei ole
test-mpeg2: không tìm thấy lệnh
test-mpeg2: komanda nerasta
test-mpeg2: Kommando nicht gefunden.
test-mpeg2: kommandot finns inte
test-mpeg2: komut yok
test-mpeg2: nie znaleziono polecenia
test-mpeg2: níor aimsíodh an t-ordú
test-mpeg2: no se encontró la orden
test-mpeg2: no s'ha trobat l'ordre
test-mpeg2: opdracht niet gevonden
test-mpeg2: parancs nem található
test-mpeg2: perintah tidak ditemukan
test-mpeg2: príkaz nenájdený
test-mpeg2: příkaz nenalezen
test-mpeg2: команда не найдена
test-mpeg2: командата не е открита
test-mpeg2: 命令找不到
test-mpeg2: コマンドが見つかりません