$P = "Путь к файлу"
$I = Get-Item -LiteralPath $P
$O = Join-Path $I.DirectoryName "$($I.BaseName) (with_silence).aac"
ffmpeg -hide_banner -y -i $I -af "adelay=1s:all=true,apad=pad_dur=1" -c:a libfdk_aac -b:a 320k $O