Loop MP4 From Converted Animated Gif

How do I convert animated gifs to mp4s that loop? This command successfully converts the gifs to mp4s, but the loop doesn't appear to work: for i in *.gif; do ffmpeg -f gif -i "$i" -loop 0 "0output$i.mp4"; done When I play the resulting mp4s in SMPlayer it will only loop if I set SMPlayer to repeat, but then SMplayer has a jitter between repeats so it doesn't repeat smoothly.