配置ADV7441采集1680*1050P60的信号，采集的视频为什么有抖动现象？

配置7441采集 1680*1050P60的信号，但是采集的视频有抖动现象
配置如下：
   

	write_add(0x03,0x9)
	write_add(0x4,0x4F);
	write_add(0x05,0x2);
	write_add(0x06,0x07);

   

	write_add(0x1D,0x40);
	write_add(0x3C,0xA8);

   

	write_add(0x68,0xF0);//ypbpr out
	write_add(0x6B,0xF3);//write_add(0x6B,0xE3);//mode6

   

	write_add(0x6A,0x68);//write_add(0x6A,0x40);
	//write_add(0x7F,0x80);
	write_add(0x7B,0x2F);//Outputs progressive timing
	write_add(0x81,0xD0);//Enable GR_AV_BL_EN

   

write_add(0x8A,0xf0);

   

	write_add(0xED,0x14);
	write_add(0xF4,0xFf);
	write_add(0x85,0x3);

   

			write_add(0x87,0xE8);//
			write_add(0x88,0xc0);///
			write_add(0x8F,0x1);//
			write_add(0x90,0xb6);//
			write_add(0xAB,0x44);//
			write_add(0xAC,0x10);//

write_add(0x91,0x10);
红色部分是我认为可能与抖动有关的寄存器，但是我配置后都没有效果。
请专家帮忙分析一下！！
谢谢~~~