how do i efficiently attach audio to an image

hi all, ive tried using shotcut and kdenlive but the outputted file ends up being huge. i have a single image and want to put audio on top (releasing a song) but these programs end up making video files where they render the same image on each frame and the files end up being huge. what is the best way to achieve my use case of making a single photo music 'video' that doesnt degrade the quality of the image and can be posted to youtube?

tl;dr: need a still image video (image is lossless) where rhe imsge isnt reduplicared and has audio