Puggo, with the audio, I popped a hall effect sensor and a magnet on the main drive of the projector, and made a simple circuit to have a 'sound pulse' with each frame trigger, recorded onto another audio track at the same time that the main audio was being captured. That way I would have a 'click' per frame.

I figured I could then use that click track to adjust the audio automagically to match the film capture as there would be a reference track for adjusting the audio.

I never got around to testing it out though on a finished capture. The clicks are in the audio file, I just never got onto working out how to then adjust the captured audio to sync, but it might be an idea that could work.