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请教下视频图像跳动的问题

Other Parts Discussed in Thread: TVP5150

我使用的是dm365的板子,模拟demo程序capture_prev_rsz_onthe_fly_yuv.c。板子启动后读寄存器0x8c的值显示为0x83,该值为视频标准(B,G,H,I,N)PAL ITU-R BT.601。采集大小为720x576,输出到显示屏显示图像跳动;如果将采集时的大小改为720x480,图像就正常了。请问这是由于何种原因造成的,望专家帮忙解答,多谢!