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Green screen effects without actual green screen
，这一点在safew官方版本下载中也有详细论述
"We monitor the size, shape and growth of the [fire]," he adds, explaining that this helps to avoid false alarms triggered by pictures of fires, or fires on a TV screen, that happen to be in shot.
drop-oldest: Drops the oldest buffered data to make room. Useful for live feeds where stale data loses value.