Video lag when slide appears
Oct 11, 2012
I've been using video in courses for awhile and haven't come across this issue yet.
Setting up a few variations to how a learner plays multiple video:
1. Four small videos on one slide. Each with the controls attached and each set with trigger to stop when the timeline starts. Users click each video to play.
2. Four thumbnails of the videos with an overlay play button. Off to the side is a larger shell to play each video. Then each video resides on its own layer. Respective triggers in place to manage this setup.
3. One main video centered on the screen.
The current format is .mov
Outside of Storyline they play fine and as intended. Yet, in any of the configurations above when you click to play, you hear audio for about 1-2 seconds and then the video catches up now out of sync. Audio ends and then you see the remaining video play.
I thought at first the lag was due to having multiple videos on one slide, but it shouldn't behave that way in option #3 with a single video on one slide.
Any thoughts? Is it perhaps the .mov format? My next move is to convert to mp4 and flv to see if there's any difference.
6 Replies
Hey, Kevin!
What are you viewing the course on?
If an iPad, I can guess why. The iPad reeks in many ways and this is one of them--limited caching ability.
Have you tried this using multiple slides instead of layers, making the slides look like a single slide?
Hey Gerry,
No, not an iPad. I set up multiple scenarios including:
- Six small videos on one slide.
- Six thumbnails on the base slide with each video on their own respective layers
- Single video on a slide
All with the same result.
The solution. MPEG4
The above examples used both .MOV and .FLV files. When converted to MPEG4 works flawlessly in all scenarios. Odd because I've not had problems with those other formats before.
Thanks but I got it working now.
Hi Kevin, have you placed video on layers before?
Yes.
I would narrow the problem down to multiple videos on a slide using layers, but the same behavior was occurring with a single video on a single slide, too.
Probably just a gremlin.
Great.
I remember in the beta when slides got media-intense and graphically complicated, things slowed up or acted weird.
Was working on a not-too-media-rich slide on a course this afternoon and editing and entering text became extremely painful and very, very, very, very S-----L-----O----W--and the text wouldn't center or right justify). Still trying to figure that one out for a bug report
I've only done one thing with multiple videos on a slide--actually, it was the same video that I just copied onto the timeline six times and then edited (trimmed) down in SL into 7 segments. Everything worked really well there (it was a WMV but was only over a minute long). See slide 3 here.
Wonder if that trick would have worked for you--combine all the videos into one video and then trim each down to what you want???
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