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DM368 resizer continous mode

hi,all;

      I'm working on dm368. I want to use the dm368 resizer in continous mode.The linux kernel version is linux-2.6.32.17 which comes from DVSDK4.0.

     I want to capture both the first and the second image.I can't get the second output image when didn't initialize the previewer module.

    after initialized the previewer module ,I can capture both the first and the second image output, but the image is not correct, I found that the Y value is

  aways zero. I have tried THE NV12 mode ,also the Y vaule  are all zero .

  btw;the fisrt image size if 704*576 ,the second image size is 320*240.

   Can anyone give me some suggestion!thank you very much