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dm8168 encode fps error

dvi过来的视频,采集60fps,nsf后设置输出帧率25fps,编码帧率设置为25fps,用视频软件看记录的h264码流,他的i帧不对,有时25帧一个,有时20帧,有时两个i帧挨着来的,请问这是原因呢?