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How to add osd on YUV420sp?

Hi,

   My board is Dm8168 EVM.SDK is EZSDK_5_05_02_00.I want to add osd to a yuv420sp frame,then encode it.But

i donot know how to add osd on the yuv420sp.Can you help me?can the omx support osd?Thank you very much.

tory