Auto replay video

I don't know why Captivates loop doesn't work, but if you execute this JS on slide enter, it will loop your video:

var interval = setInterval( checkExists, 100 );

function checkExists()
{
if ( document.getElementsByTagName( 'video' ).length > 0 )
{
clearInterval( interval );
var vid = document.getElementsByTagName( 'video' )[ 0 ];
vid.loop = true;
}
}

1. Add your video to your slide as Event Video
2. Make sure the slide doesn't play automatically to the end of the slide by adding a button that pauses the slide before the end of the slide. For example, a shape used as a button to take you to the next slide when you're ready. The looping feature doesn't work if your slide plays to the end of the slide without being paused.
3. Select Auto Play if you are not using a skin (playbar)
4. Navigate to the Timing panel and uncheck Pause slide till end of video.
5. Select Loop

Generally, I prefer slide video over event video for a number of reasons. For example, Slide Video allows for Closed Captioning and will play in sync with the rest of your Adobe Captivate project, but if you need the video to just keep running in a loop indefinately this is how you can do it.

Have a look at my blog post:

Looping Slide Video - eLearning (adobe.com)