Correct me if I'm wrong but have you done four jobs for free for this same videographer since August of last year? If that's the case then I think that's well past your quota for free work for one year. It sounds like this person is taking advantage of you.

I would certainly be looking for money now and wouldn't do any more work for him until payment was made, it doesn't matter if you didn't sign a contract, you made a verbal agreement (I presume for work done and how much you would be paid for it?) when you first met. I think he needs to be confronted now about this issue and as you say if that doesn't work, then leave him during his 'awards ceremony' and see how much he likes that.

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Better than a poke in the eye with a pointy stick any day...