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VPSS驱动读取帧率与设置不符的问题

Other Parts Discussed in Thread: TVP5158

我设置TVP5158读取视频的帧率为60fps。但我在调用fvid2_dequeue函数读完从驱动取来的数据发现,每秒可以读100帧左右的数据,这是什么情况?下图是我加打印消息的地方。