The Media Player feature that I originally created is now part of the mojoPortal core features as of release 2.3.7.6 on 12.28.2011. It now has been broken up into two separate features (Audio Player and Video Player).
I recommend that you update your instance(s) of mojoPortal to the latest release to take advantage of the latest updates.
Unfortunately there is no way to take existing Media Player instances and convert or export/import them into Audio/Video Player instances. You will just have to re-create your instances of your Players with the new core features.
Please feel free to use my contact form if you have any questions, or also feel free to post questions on the mojoPortal forum.