bash script ffmpeg expert for aac audio get exactly 4 second

Hello. I've decided to place my bid here, because I've done a lot of ffmpeg-related projects here. P.S. I do not ask for any upfront payments. Please send me sample file(s), so I could start asap. Thank you.

hello , ffmpeg must cut on keyframes only please try another audio file ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

I'm honest Relevant Skills and Experience I have already complete some task like that