avisync: 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/avisync - from package: transcode

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

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