Problems when using Rszcopy on DM355EVM

Working procedure of my code IPIPE capture image data , memcpy to inBuf, and JPEG encode inBuf. Memcpy costs about 23ms for 1280x720 pixels, I refer to encode demo, now rewrite my code using Rszcopy.

#include "rszcopy.h"

int capbuf;
static struct buffer ipipebuffer;

// rszcopy init
Rszcopy_Handler hRszcopy = RSZCOPY_FAILURE;
hRszcopy = Rszcopy_create(RSZCOPY_DEFAULTRSZRATE);
Rszcopy_config(hRszcopy, 1280, 720, 1280*2, 720*2);

// capture
CaptureFrame(&capbuf); // capture from MT9T001
DOIPIPING(RAW2YUV, 1280, 720, 1280, 720, capbuf);

// memcpy(inBuf, ipipebuffer.start, inBufSize);
// Rszcopy_execute(hRszcopy, ipipebuffer.start, inBuf);

// ... encoding procedure..

If I use memcpy, all is ok. But if using Rszcopy_execute, nothing was copied but return 1. Anyone could help me to solve this?