Can I apply even if I haven't yet completed a full year in a media-related field?

It is basically up to you to decide when to apply to the program.

Ideally, you should have already worked for at least 12 months in the media sector when you apply. At the very least, you must have acquired this experience by the time the program begins in September. In other words, you can apply if you have not yet completed a full year in the field but your chances of being accepted are higher if you fulfill the requirements at the time of applying.