cuda decoder API problem

When I’m trying to use “cuda decoder API” (project name in SDK Samples: cudaDecodeD3D9 and cudaDecodeGL)
I compiled & run the sample and got a black screen… It can decode but display nothing.(It seems GPU DRAM never update.)

My card is GT 130M (laptop)

Anybody can tell me why?

Besides, is CUDA Decoder API using VP/VP2 as hardware decoding or just uses GPU as a GP-GPU to implement parallel computing?

After seeing this API, now I’m considering whether FFMPEG + CUDA is a good developing idea to speed up decoding…

Thanks in advance!