gstreamer-properties: 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 CentOS possible default full paths are:

/usr/bin/gstreamer-properties - from package: gnome-media-apps

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/gstreamer-properties - from package: gnome-media

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

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