> they need to be synchronized to the level that audio matches up correctly, which is much more precise than video as audio uses sample frequencies in the 48Khz-96Khz range, whereas video of course is typically just 60Hz

Typically video equipment expects the individual pixels to line up, save for some buffering (~1–10µs), not just the individual frame. So your synchronization requirement for video is in the gigahertz range (or about megahertz, if you take the buffering into account), not 60 Hz. (Of course, what matters is normally the absolute offset, not the frequency, but they tend to be somewhat inversely related.)