DM365: JPEG encode problem

Dear all,

     my software is dvsdk4.02, dmai_2_20_00_15.

         my input yuv is 1280x720 but I just want to encoder the left half part, so I setting :
         dynParams.inputWidth = 640; /left half

        dynParams.inputHeight = 720;

         dynParams.captureWidth = 1280; //line length

          Ienc1_create(hEngine, args->codecName, &params, &dynParams);

        Ienc1_create will fail and the encStatus.extendedError is 0x0000c00a, which means "Error in capture width parameter".

      How can I do this? Is this means I must use edma to copy it before encoder?

  Best Regards, 姜 维