WebMultimediaPlayer poster setting

WEB TMS WEB Core
8

I am creating WebMultimediaPlayers at runtime. I need to set the poster to be 10 secs in.

I see I can add #t=10 to the url but this also starts the video at 10 secs in.

The solution is:

<video preload="metadata" width="320" height="240" controls>
      <source src="video.mp4#t=10" type="video/mp4">
    </video>

How do I add the preload="metadata" at runtime please.