dm8168 分辨率

你好，我先在做dm8168拼接，是这样的我采集四路视频同时创建以NULLSRC，我将拼接视频放在NULLSRC中并显示流程如下

Capture (YUV422I) 16CH D1 60fps
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NULL SRC (YUV420SP)
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+------------+ |
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MERGE
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STITCH
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SW Mosaic
SC5 YUV422I)
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OSD
GRPX0 |
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On-Chip HDMI
1080p60

，部分代码如下

for(i=0; i<nullSrcPrm.inputInfo.numCh; i++)
{
System_LinkChInfo *pChInfo;

pChInfo = &nullSrcPrm.inputInfo.chInfo[i];

pChInfo->dataFormat = SYSTEM_DF_YUV420SP_UV;//SYSTEM_DF_YUV420P;//SYSTEM_DF_YUV422P;
pChInfo->memType = SYSTEM_MT_NONTILEDMEM;
pChInfo->startX = 0;//48;
pChInfo->startY = 0;//32;
pChInfo->width = 1920;//stitchSrcWide;
pChInfo->height = 1080;//stitchSrcHeight;
pChInfo->pitch[0] = SystemUtils_align(pChInfo->width+pChInfo->startX, SYSTEM_BUFFER_ALIGNMENT);
pChInfo->pitch[1] = pChInfo->pitch[0];
pChInfo->pitch[2] = 0;
pChInfo->scanFormat = SYSTEM_SF_PROGRESSIVE;
}

当我存放两幅图像时正常，

但是我拼接的图像分辨率大于1920 ，大约是3680*720，所以修改如下时

for(i=0; i<nullSrcPrm.inputInfo.numCh; i++)
{
System_LinkChInfo *pChInfo;

pChInfo = &nullSrcPrm.inputInfo.chInfo[i];

pChInfo->dataFormat = SYSTEM_DF_YUV420SP_UV;//SYSTEM_DF_YUV420P;//SYSTEM_DF_YUV422P;
pChInfo->memType = SYSTEM_MT_NONTILEDMEM;
pChInfo->startX = 0;//48;
pChInfo->startY = 0;//32;
pChInfo->width = 3920;//stitchSrcWide;
pChInfo->height = 1080;//stitchSrcHeight;
pChInfo->pitch[0] = SystemUtils_align(pChInfo->width+pChInfo->startX, SYSTEM_BUFFER_ALIGNMENT);
pChInfo->pitch[1] = pChInfo->pitch[0];
pChInfo->pitch[2] = 0;
pChInfo->scanFormat = SYSTEM_SF_PROGRESSIVE; 
}

当代码初始化失败，这时还没有开始拼接，请NULLSRC创建空视频分辨率有限制吗，还是其他原因导致？

谢谢