SS928 从VPSS组获取原始图像有问题？

我想从vpss或者vi获取一帧yuv数据并且存文件；但是存的文件使用yuvplayer(yuv查看工具)打开没有图像是蓝屏？
像素格式是：OT_PIXEL_FORMAT_YVU_SEMIPLANAR_420
视频格式是：OT_VIDEO_FORMAT_LINEAR
`static void *get_yuv_frame(void)
{
hi_s32 ret = 0;
yuv_run = 1;
int i = 0;
while (yuv_run)
{
hi_video_frame_info vpss_frame;
ret = ss_mpi_vpss_get_grp_frame(0, &vpss_frame, 10);
if (ret != HI_SUCCESS)
{
ss_mpi_vpss_release_grp_frame(0, &vpss_frame);
sleep(1);
continue;
}
printf(“width : %d, height : %d\n”, vpss_frame.video_frame.width, vpss_frame.video_frame.height);
printf(“prefix formate : %d, video formate :%d\n”, vpss_frame.video_frame.pixel_format, vpss_frame.video_frame.video_format);
int fd = 0;
int ret = 0;
char fileName[64];

    sprintf(fileName, "yuv_%d.yuv", i++);

    fd = open(fileName, O_CREAT|O_RDWR);

    ret = write(fd, vpss_frame.video_frame.virt_addr,vpss_frame.video_frame.width*vpss_frame.video_frame.height*1.5);

    close(fd);
    ss_mpi_vpss_release_grp_frame(0, &vpss_frame);
    sleep(1);
}

return;

}`
该代码是测试代码，有没有大佬看下是什么问题