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How to send opencv video's to ffmpeg

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I m trying to send the processed opencv Mat as video to ffmpeg. I m encoding the frame and writing it to std output and then piping it to ffmpeg. Here is my code. **C++:** if(!cap.isOpened()) { cout << "Video not accessible" << endl; return -1; } else { cout << "Video is accessible" << endl; } while (true) { cap >> frame; //some processing cv::imencode(".jpg", frame, buff); for (i = buff.begin(); i != buff.end(); ++i) std::cout << *i ; } My input video resolution is 640x418. I do not alter the video size After building, I use following command to execute. `./a.out | ffmpeg -f rawvideo -pix_fmt bgr24 -s 640x418 -r 30 -i - -an -f mpegts udp://0.0.0.0:8182` and also this `./a.out | ffmpeg -i pipe:0 -f rawvideo -pix_fmt bgr24 -s 640x418 -r 30 -i - -an -f mpegts udp://0.0.0.0:8182` However none of this seems to work. Kindly help.

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