gmerlin_visualize: 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
/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/gmerlin_visualize - from package: gmerlin

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