I think you could get something working using termux to install and run ffmpeg on your phone. Then using an automation app, e.g. if this then that, you could run a script in termux to re-encode the files. And automate it at night while charging.
People like to think that because they own a gun, if they ever got to use it they would be John Wick.
Way too true, I know too many people who are genuinely like this my brother included. If people have this kind of mindset they shouldn’t be allowed to own guns, it is a tragedy waiting to happen.
Also apparently cron works in termux, so it could all probably be scripted there.