Verify drops, including in frame-by-frame scrub. Tedious.
Actual frame TBCs (in the context of consumer analog format usage) RAM buffer to prevent any drops, but truly awful footage doesn't contain enough complete field/frame data to stop drop. TBCs are chip sets, not just single chips, and RAM is part of the set. Furthermore, the programming matters, which is why some TBCs are flawed, some are crap, some are marginal.
Non-source drops are somewhat easy to locate in comparative analysis Avisynth scripting. Not flawless, but detection less tedious than manual scrub.
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