c++ - QCameras reduced perfomance -


i need create lot of qcameras. if there more 4 cameras video start glitching. system load isn't much. cpu<5% ram>4gb , happens, launch camera without viewfiender.

how add additional cameras? resources qcamera consume? 

for (int i=0;i<size;i++) {     videoitems[i]=new qgraphicsvideoitem;     videoitems[i]->setsize(qsize(x,y));     videoitems[i]->setoffset(qpointf(x*col,y*row));     scene->additem(videoitems[i]);     camera[i]=new qcamera(source);     camera[i]->setcapturemode(qcamera::captureviewfinder);     camera[i]->setviewfindersettings(setting);     camera[i]->setviewfinder(videoitems[i]);     camera[i]->start();     col++;     if(col==columns)     {         col=0;         row++;     } }


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