Seek does not work in flash player

I have the same issue that is explained in these posts, any news about it?

(http://)Unable to seek in time


We no longer actively support the Flash player, you may use it but I’m afraid no bug fixes will be made.
I strongly suggest you move to our HTML5 one.

Ok, thanks for the quick response.
How can I change the player which is used in the kaltura backend (for preview, trim, clip, ecc…)? Currently it is in flash.
Is very tricky trim a long video without “seek” functionality.