in mgui im able to keep audio if it is ac3 but im unable to find a way to get to keep aac audio or even demux it so im able to select it so its able to be remuxed after video is converted

audio is lc aac 128kb and video is h.264 8000kbps 720x576 .ts tv rip so there no point reconverting the audio when the bitrate is already so low

so is there a way to remux the audio without using any other apps ?