Imbed video in powerpoint video recording

I've imbedded a youtube video link in a Power Point presentation.

I recorded a slide show. During the recording I click the video so that it plays while I am recording a narrative. When I play back the slide show the video does not automatically play. There is a play button on the video that has to be manually clicked on. 

Is there a way to have the youtube automatically play when a user gets to that point in the slice show. The youtube video should begin to play as soon as slide 4 is shown.

Thank you

Charlotte