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ss928数据格式转换问题
利用ss_mpi_vpss_get_chn_frameot获取_video_frame_info格式图像数据，请问如何转换到ot_svp_img的数据
数据格式相同的前提下不需要数据转换，直接把ot_svp_img相关指针指向video_frame_info的即可
如果数据格式不相同，先创建个相同的ot_svp_img指向video_frame_info，然后创建目标格式的ot_svp_img，用IVE转换一下，注意支持的格式有限制。
我ot_video_frame_info的格式是OT_PIXEL_FORMAT_YVU_SEMIPLANAR_420，然后我直接创建了OT_SVP_IMG_TYPE_YUV420SP格式的ot_svp_img，把他们的宽高，物理虚拟地址，stride赋值，用mmz给ot_svp_img申请了一段内存。这种算格式相同么
要么不用mmz分配直接把ot_svp_img指向ot_video_frame_info，要么mmz分配ot_svp_img，相关内存调用接口做映射，然后把ot_video_frame_info的数据拷贝给ot_svp_img
不用mmz的话，指向后取数据会发生segmentfault。现在分配mmz的话，程序运行第一次不会报错，运行第二次就报下面这个错，只能重启运行，
。
不用mmz的话在ss_mpi_vpss_get_chn_frame之后和ss_mpi_vpss_release_chn_frame之前能用
分配mmz的话你程序退出的时候没把mmz释放掉，导致第二次跑程序的时候不能正常初始化vb
ss_mpi_sys_mmz_free的时候第二个参数不能是NULL吧，你上面映射的虚拟地址填上去
我程序最后加了ss_mpi_sys_mmz_free，而且不分配mmz我上面取数据会发生segmentfault，是我代码问题么
那没道理啊
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