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video preview question

I connect an analog camera to 648evm, with running the demo file (video_preview_pal), but there is no video output, I had checked the camera and sw4(switch pal and ntsc).

I checked the source code, It creates VP0(input) and VP1(output).

On dm648 evm board , there are 2 group vport,  I doubt the demo file adopt the VGA interface as the VIN and VOUT.  but not the composite av interface.

can anyone verify my question?