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I found out the reason. I changed the pixel format from rgb24 to bgr24 and it worked.

Thanks. Now am sending to socket and from there reading from ffmpeg. However I have one issue. The color of the video is different. Any ideas?

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.