lives_ogm_encoder3: 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 Debian possible default full paths are:

/usr/bin/lives_ogm_encoder3 - from package: lives-plugins

You may install the required package with command apt-get install {package}
Error in other languages:
lives_ogm_encoder3: bevel nie gevind nie
lives_ogm_encoder3: comandă negăsită
lives_ogm_encoder3: comando não encontrado
lives_ogm_encoder3: commande introuvable
lives_ogm_encoder3: command not found
lives_ogm_encoder3: käsku ei ole
lives_ogm_encoder3: không tìm thấy lệnh
lives_ogm_encoder3: komanda nerasta
lives_ogm_encoder3: Kommando nicht gefunden.
lives_ogm_encoder3: kommandot finns inte
lives_ogm_encoder3: komut yok
lives_ogm_encoder3: nie znaleziono polecenia
lives_ogm_encoder3: níor aimsíodh an t-ordú
lives_ogm_encoder3: no se encontró la orden
lives_ogm_encoder3: no s'ha trobat l'ordre
lives_ogm_encoder3: opdracht niet gevonden
lives_ogm_encoder3: parancs nem található
lives_ogm_encoder3: perintah tidak ditemukan
lives_ogm_encoder3: príkaz nenájdený
lives_ogm_encoder3: příkaz nenalezen
lives_ogm_encoder3: команда не найдена
lives_ogm_encoder3: командата не е открита
lives_ogm_encoder3: 命令找不到
lives_ogm_encoder3: コマンドが見つかりません