I have had some success getting \animategraphics to "start" a movie when doing a presentation with only a PgDn or space click, allowing for a single button to advance through slides
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Code, edit and compile here:
\visible <1-1>{\includegraphics[height=2.8in]{./movie/movie-101}} \\\visible <2->{\vspace{-2.81 in}\hspace{.05 in}\animategraphics[height=2.8in,autoplay,palindrome,loop]{8}{./movie/bbmovie-1}{01}{25}}
The first image shows when you come to the slide, then the movie starts when you hit advance.
I tried using the \only flag for the visible objects, but I could not get it to work so I had to back up the second object, the animategraphics movie itself.