Firefox html5 video rewinds instead of playing - firefox

Question

I am using video tag on my website. It works with every major browser, but I am running into issues with Firefox.
When I tap on the play button video scrolls to the end of video!
In order to start the video I need to rewind video to position other than start and than click on play.
Weird.
I tried to set initial position of video to 1s but it didn't help.
I still need to scroll it manually.
Any help will be appreciated.
Thank you
<video width="80% height="80%" controls id="video1">
<source src="videos/<cfoutput>#getVideo.URL#</cfoutput>.mp4" type="video/mp4">
<source src="videos/<cfoutput>#getVideo.URL#</cfoutput>.ogv" type="video/ogg">
<source src="videos/<cfoutput>#getVideo.URL#</cfoutput>.webmhd.webm" type="video/webm">
Your browser does not support the video tag.
</video>
Javascript:
V I D E O */
function setupVideo(){
if(!myVideo){
console.log("Setting up video");
myVideo=document.getElementById("video1");
timeElapsed = 0;
timer;
myVideo.addEventListener("play",videoStarted,false);
myVideo.addEventListener("pause",videoPaused,false);
myVideo.addEventListener("loadeddata",videoLoaded,false);
console.log(" Video Element is: "+myVideo);
}
else{
console.log("Video Was Already set");
playPause();
}
}
function playPause()
{
if (myVideo.paused)
myVideo.play();
else
myVideo.pause();
}
function videoLoaded(e)
{
console.log(" Video Loaded ");
myVideo.currentTime = 1;
}
function videoStarted(e)
{
console.log("Video Started");
//start the timer
timer = setInterval(videoPlaying,1000);
}
function videoPlaying(){
timeElapsed ++;
console.log("Video Playing "+myVideo.currentTime);
if(Math.ceil(myVideo.currentTime)== 10)
{
console.log(" it reached 10 now display quiz");
playPause();
}
}
function videoPaused(e)
{
clearInterval(timer);
console.log("Pause");
}

Answer 1

Your WebM or OGV video may have negative or invalid timestamps. Some software produces video that starts at a time slightly less than zero, particularly if the audio and video frames are not aligned to start at the same time. (That is, the video may start slightly before 0 and the audio may start at 0.)
If the video is produced with ffmpeg, try using the option -avoid_negative_ts 1.
If you have the mkvtoolnix package installed you can view the timestamps in a webm file with the command mkvinfo -s file.webm.