In Linux this is possible in a terminal, with the following command:
ffmpeg -loop 1 -i image.jpg -i audio.mp3 -c:v libx264 -tune stillimage -c:a aac -b:a 192k -vf "scale='iw-mod(iw,2)':'ih-mod(ih,2)',format=yuv420p" -shortest -movflags +faststart out.mp4