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AFAIK, locking to an external clock is needed if several machines need to be synchronized.
How could they implement stable freeze frame without aligning all the scanlines first? Did not they need to have a "frame TBC" of sorts?
Some expensive camcorders like Sony V5000 had TBC, but they were explicitly meant to be dubbed from. And then Sony stopped making them in a year or two, allegedly because pros bought them instead of betacam.
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