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video delay question of dm3730

Other Parts Discussed in Thread: DM3730

hi,there is a strange problem about video framereate using dm3730.

dm3730 has 3 threads that is capture,video and write thread.

capture thread get image data from driver via dmai api captureget/captrueput.

video thread compress video stream to h264

and write thread send h264 vodeo or write file.

that is whole flow of dm3730 video encoder progrom.

In the capture thread i do some data copy things using memcpy function like copy a D1 image data to a new address,and i found video is not  very fluent that delay almost exists at 7-10 seconds,in contrast  when i dont use memcpy functon,every thing is ok and frame rate is about 25 per seconds.it confused me?Is memcpy function costs high?or there exist some problem of video driver of dm3730.

Anybody meet the same problem?please help me!