Store current timeline value

um you possibly don't need to know the numbers.... http://www.richardleehill.com/hero/elc124/

The above link was done with video on the base layer and a series of hotspots and drag interactions just stopped at key points in the storyline automatically.  You can adjust the  entry and exit time a hotspot is on your main timeline by just grabbing the ends( https://community.articulate.com/articles/syncing-animations ).  If you move the playhead to specific points on the base layer, your video will show you what frame its on.   I imported mine in mp4s to my base layer , and removed the seekbar.  The only trick is that you will have to place and lock a rectangle with formatted color to transparent over your video( or it will alternate play and stop with every click on it- independent of the timeline)  If you want your video to stop, your hotspot could do that, but in principle most scenarios could use this technique (no javascript necessary)