avisplit: 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/avisplit - from package: transcode

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

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