As I understand, I do an extraction simply to load up the alignments file with all the frames I skipped during training. Then I use the manual tool to fix alignments and do masks just like with training, but there are THOUSANDS of frames.
If that's what has to be done, so be it, but I really don't want to go through a thousand frames if there's something I don't know about how the tool works. Is it really necessary to fix each frame that's out of alignment? Or does the training take care of some of those somehow?