Same-codec re-muxes (H.264 in both MP4 and DivX) produce nearly-identical sizes. Codec changes can swing things dramatically: H.264 -> H.265 typically halves the file at the same visual quality; H.264 -> VP9 is roughly comparable; AV1 is currently the smallest at the cost of slower encode time.
ໄຟລ໌ DivX ຈະຫຼິ້ນໃນ iPhone / Android / Smart TV ໄດ້ບໍ?