I used this crappy little app whose name I forget. These days I'd probably use Premiere's builtin support, since I already own a copy, assuming I didn't find a good freeware package. For triggering I ended up taking the ball out of a mouse, carefully positioning the cursor over the 'take next frame' button, and using it as a foot pedal. It mostly worked okay, but I wouldn't exactly brag about the experience.
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