[Plugin:pro-player] ingest a few seconds before streaming

I am using pro-player to stream video that I am hosting. I’d like to cache a few seconds first before the player starts. It would seem that this should buffer 10 seconds before play begins, but it doesn’t.

Can someone give me a hand, please?

<?php 

print insert_proplayer(
             array(
                "width" => "320",
                "height" => "240",
                "type" => "flv",
                "bufferlength" => "10",
                            ),
             "https://www.enjoywestchester.com/wp-content/uploads/westchester_open.flv"
        ); 

    ?>