avifix: 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/avifix - from package: transcode

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

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