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// convert the image to JPEG ( in memory! )

std::vector<uchar>outbuf;
std::vector<int> params;
params.push_back(CV_IMWRITE_JPEG_QUALITY);
params.push_back(100);
cv::imencode(".jpg", frame, outbuf, params);

then send the outbuf from your socket. i don't think you'll need additional base64

if you want to send an mjpeg stream, not a single image, you want to wrap that with a http-multipart form:

"Server: Mozarella/2.2\r\n"
"Accept-Range: bytes\r\n"
"Connection: close\r\n"
"Content-Type: multipart/x-mixed-replace; boundary=mjpegstream\r\n"
"\r\n"

then, for every frame:

sprintf(head,"--mjpegstream\r\nContent-Type: image/jpeg\r\nContent-Length: %lu\r\n\r\n",outlen);
write(sock,head,strlen(head));
write(sock,(char*)(&outbuf[0]),outlen);

good luck!