Sync issues with graphics over video

May 11, 2018

Hi everyone, 

I have an mp4 embedded on a slide with some graphics over the top. The graphics are name slates hiding the original titles on the video, so the sync timing is essential. Unfortunately they are not lining up. When I preview the slide in storyline it plays and the graphics appear as they are supposed to, but when publishing (to LMS/.zip then uploading) the discrepancy is about 10 seconds. Not on all the graphics, just the later ones. 

Is there something I need to consider when embedding video in storyline? What the is the framerate the slides run at? 

6 Replies
Bob O'Donnell

Can you do the editing in a video editor?

I had the same question earlier. If I scrubbed the Seekbar or clicked in the Seekbar to change the time point the video got out of sync with the other layers we added in.

In doing some research, I found an old post that suggested the keyframes in the video should be increased. I have not tried that option yet to see if it works. We ditched what we were doing and approached the problem another way. I do plan on testing it soon.

Walt Hamilton

I've had good luck with not using a timeline on the video. If the video doesn't have a timeline, it uses the slide timeline, and Articulate has pretty well fixed the  scrubbing out of synch problem.

One caveat: if you click the video, it will stop, the slide timeline will not, and things get out of whack. I put a transparent (Not invisible) cover over the video to prevent clicking.

I've got about 150 modules that are video based, and constantly have graphics appearing and disappearing, and they are all always on time, so you may want to explore the possibility that your LMS has buffering issues.

Bob O'Donnell

Walt, That's not what we're experiencing. Scrubbing the timeline that has a video on it puts everything out of sync. AND - this behavior is not through an LMS. We can replicate the issue playing the file directly back off our server so its not being buffered through an LMS system over the web. My guess is the timing would be even worse.

If you just let the timeline play and don't touch it, yes it all looks good. We did hide the videos using the transparent object trick, but our users still have control over the Seekbar. I still haven't had any "free" time to play with it as we are on tight deadlines for a project.

Just curious, can you share a link to one your published modules or even a single slide as a sample?

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