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Hello, I am recording video like this

unsigned char* frame;//rgb raw data
int width = 800;
int height= 400;

Size frameSize(width, height);
VideoWriter recorder(name.toStdString(), CV_FOURCC('M', 'R', 'L', 'E'), 20, frameSize, true);
Mat _frame(frameSize, CV_8UC3);

_frame.data = frame;
_recorder.write(_frame);

_recorder.release();

But no frames is recorded. File size is 0. Can you help me to find out what i am doing wrong, please.

Hello, I am recording video like this

unsigned char* frame;//rgb raw data
int width = 800;
int height= 400;

Size frameSize(width, height);
VideoWriter recorder(name.toStdString(), CV_FOURCC('M', 'R', 'L', 'E'), 20, frameSize, true);
Mat _frame(frameSize, CV_8UC3);

_frame.data = frame;
_recorder.write(_frame);

_recorder.release();

But no frames is recorded. File size is 0. Can you help me to find out what i am doing wrong, please.