Hey Stu,
I'm currently enrolled in Ryerson's Film Program, and thought I'd help with any questions you might have about the application process.
Similar to you, I was also surprised to see that we were not able to submit film/video footage with our portfolio, but instead had to include 6 pieces of still work. My advice is also similar to Heliotrope's - try to showcase your personal creativity. Submit a portfolio that will differentiate yourself from the thousands of other students applying for the same spot.
My portfolio consisted of some black and white photography, some stills from a few short films, some computer generated artwork, as well as a piece from art class. I tried to show my artistic diversity as a filmmaker.
Other important things to remember are the additional requirements to go along with the portfolio. I was required to include submit a project proposal, a written statement of my inspirations as a filmmaker, and a resume. These are also important to consider when working on your portfolio.
Anyways, if you have any other questions about the application process, program, school, or whatever, just let me know.
I also applied to York, Humber and Sheridan for similar programs, so if you want to chat about any of them, feel free.