jPlayer stutters looped video in FireFox - jplayer

Question

I have an mp4 video with an animation cut in such a way that when looped would not show a break. When I ask jPlayer in Chrome to do this, it works fine, but in FireFox it pauses itself for about a 1/3 second before re-playing the loop.
So I tried to have the video play itself over again when it gets to the last 1/2 of a second. I added a 1/2 second to the end of the video that matches the first 1/2 second, and when the jPlayer timeUpdate event determined that we where in the last 1/2 second it would call play with a start time that would match it up with the position it was at (0 + (0.5 - timeLeft)). Once again, Chrome did this well and while a bit better of a match, Firefox failed to render a perfect loop.
Is this something mythical with the current state of web browsers, or am I missing something?
function buildJPlayerMotions(video_name) {
return function readyVideo() {
$(this).jPlayer("setMedia", {
m4v: "/assets/videos/" + video_name +".mp4",
});
};
}
function loadMotionsJplayer(id) {
$('#' + id).jPlayer({
ready: buildJPlayerMotions(id),
swfPath: "/assets",
supplied: "m4v",
backgroundColor: "#FFFFFF",
size: { width: '728px',
height: '402px'},
timeupdate: function(){
var currTime = $('#' + id).data().jPlayer.status.currentTime;
var movieLength = $('#' + id).data().jPlayer.status.duration;
var timeRemaining = movieLength - currTime;
if (timeRemaining < 0.5) {
$('#' + id).jPlayer("pause");
$('#' + id).jPlayer("play", 0 + (0.5 - timeRemaining));
}
}
});
}