The PS3s' DVD and Blu-Ray player is region locked. This means that your Australian PS3 can only play DVD and Blu-Ray movies made for the region Australia is in or are region free (region code 0).
For DVD's, Australia is region code 4.For Blu-Ray, Australia is region code B or region code 2.Although this doesn't help your current problem, the PS3 is region free for PS3 games (you can play games from any region).
To work around this, I propose either ripping the DVD to your computer, then burning it onto a different DVD or streaming the DVD directly from your computer to the PS3. Streaming is definitely the better bet if you have more DVD's from another region.
To rip and burn your own copy, use a blank DVD disc and DVD burning/ripping software such as Nero.
To stream to your PS3, check out the following:
PS3 Media Server (my personal favorite) for PC
TVersity for PC
MediaLink for Mac
Enjoy your movie (hopefully)!
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