How to add string in a Frame ?

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How to add string in a Frame ?

Hi All:

I using DM6446 platform:
1, capture RGB raw data from
CMOS sensor by CCDC,

2, RGB ==> YUV by preview engine,

3, encode to H.264 video, format:736*480

I want to add string, like time or date in each frame.

how to add it? Is there any Doc. or wiki for reference?

Best regards!