Forum Discussion
Audio and Video out of sync when using Seekbar
Hi all,
Thanks everyone for your patience.
We have been actively investigating this specific issue for some time now and are now able to share an update on our progress with you.
The sync issue stems from a limitation with the way Flash handles video. It is only possible to sync playback to the nearest video keyframe. Keyframes may occur multiple times per second, but in some videos it may be several seconds between keyframes. If the seek bar is moved to a position that does not correspond to a keyframe, the timeline will play from the precise position selected but video will only play back from the nearest keyframe, causing the sync issues described above.
The Storyline team is working on a fix which is currently slated to be included in the next update for Storyline 2. The fix works around the Flash limitation described above by limiting seeking during video playback in Flash to positions that line up with the video’s keyframes. We will share further information on timing for the update (which addresses several other customer-reported issues as well) on this thread once it has gone through our usual testing process.
In closing, I wanted to assure everyone that we closely monitor these discussions and take the issues you report incredibly seriously. The seven major updates we’ve shipped for Storyline 2 since its initial release have addressed a long list of customer-reported issues at no cost to our customers. You have our commitment that we will continue to actively evaluate and fix reported issues for the lifetime of the product.
Hi Ashley! I'm having issues with this problem in a current course , and I reeeeeaaalllly wanted this to be a fix, so I tested it. I didn't get very good results though.
I went ahead and created two versions of the same video, one with keyframes at 90 and one with keyframes at 5. And i published both courses at 29.97fps (pretty standard). I separated the audio from the video and posted each video on a separate slide under the exact same conditions. I got what looks to be the exact same amount of ... ummm... 'un-synced-ness?'. And it's pretty big chunks of time, even though a video at 30fps with keyframes at every 5 should have 6 keyframes/second, and therefore only a .2 second disconnect with the audio at most. I posted my test version here.
www.ezlearnin.com/Clients/Test/keyframes/story.html
I'm attaching the source file as well. To me, it was really weird that video lag was pretty much exactly the same at each point when comparing the videos, BUT, the lag was longer at the first point than it was at the second and third.
The html5 version is spot on though!
http://www.ezlearnin.com/Clients/Test/keyframes/story_html5.html
So, I guess with that said, I'm wondering if there might be some additional information regarding the keyframe issue that was left out? Or maybe I'm missing something? I'm pretty handy with Adobe Premier Pro, so any further insight would be helpful.
P.S.... Much appreciation for your peaceful moderation of these kinds of issues! It seems like you're always moderating the issues with no end in site. I'm sure it's a tough position to be in. :(
Thanks Ashley!