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• Best Codec and Pixel Formats to use in FFMPEG Pipeline

  19 décembre 2022, par user20623229

  I have created an FFMPEG Pipeline to stream video frames to an RTSP server. The frames are RGB frames with 3 dimensions. My pipeline command is as follows :

  


  openPipeLine = _popen("ffmpeg -f rawvideo -r 30 -video_size 720x1280 -pixel_format bgr24 -i pipe: -vcodec libx264 -crf 24 -pix_fmt yuv420p -f rtsp rtsp://localHost:8554/mystream", "w");


  


  I can barely make out the picture when I connect to the server via VLC Media. The colors seem scrambled. I've attached a sample image and the output on the server.

  


  Are there any recommended Codec's that I can use to solve this ? Perhaps the pixel format should be changed. I'm currently using a Codec and pixel format that I found online without knowing if these are the best options.
original frame
server output

  


  Thank you very much.

  


• FFMPEG Pipeline

  7 décembre 2022, par user20623229

  I created an FFMPEG pipeline so that I can stream video frames to an RTSP server. I created a synthetic video for testing where each frame is a green number on a black background. The video plays on my screen but it does not stream to the server because I get the error "Unable to find a suitable output format for 'rtsp ://10.0.0.6:8554/mystream"
My code is below. The source code is taken from the answer : How to stream frames from OpenCV C++ code to Video4Linux or ffmpeg ?

  


  int main() {
    int width = 720;
    int height = 1280;
    int fps = 30;

    FILE* pipeout = _popen("ffmpeg -f rawvideo -r 30 -video_size 720x1280 -pixel_format bgr24 -i pipe: -vcodec libx264 -crf 24 -pix_fmt yuv420p rtsp://10.0.0.6:8554/mystream", "w");



    for (int i = 0; i < 100; i++)
    {
        Mat frame = Mat(height, width, CV_8UC3);
        frame = Scalar(60, 60, 60); //Fill background with dark gray 
        putText(frame, to_string(i + 1), Point(width / 2 - 50 * (int)(to_string(i + 1).length()), height / 2 + 50), FONT_HERSHEY_DUPLEX, 5, Scalar(30, 255, 30), 10);  // Draw a green number

        imshow("frame", frame);
waitKey(1); 

        fwrite(frame.data, 1, width * height * 3, pipeout);
    }
    // Flush and close input and output pipes
    fflush(pipeout);

    _pclose(pipeout);   //Windows
    return 0;
}


  


  When I change -f rawvideo to -f rtsp in the FFMPEG command, I no longer get the error but the program just displays the first frame on the screen and seems to get stuck. Is there a wrong parameter in the pipeline. When I change the RTSP url to a file name such as output.mkv, it works perfectly and saves the video to the file.

  


• Getting this error in ffmpeg pipeline : Non-monotonous DTS in output stream 0:0 ; previous : 4951970, current : 4951659 ; changing to 4951971

  6 décembre 2022, par RoshaanAli

  Error : Non-monotonous DTS in output stream 0:0 ; previous : 4951970, current : 4951659 ; changing to 4951971. This may result in incorrect timestamps in the output file.

  


  I am using AWS Chime streaming then passing there data stream to FFMPEG and then going live with that data stream using AWS IVS(Interactive video service).
I am using ffmpeg for changing aspects of video on live streaming and brightness and contrast.
But when we turn off camera and after some time reopen it we facing the above mention error.
I have read about concat but we don't have input file actually we are passing data stream is ffmpeg that's why its not working.

  


  Here is my ffmpeg command

  


  ffmpeg=ffmpeg.spawn('ffmpeg', [
            '-i', '-' ,
            // '-f', 'concat',
            // '-segment_time_metadata','1',
            // '-use_wallclock_as_timestamps', '1',
            '-c:v', 'libx264',
            '-b:v', '2567k',
            '-maxrate', '6000K',
            '-preset', 'ultrafast',
            '-profile:v', 'baseline',
            '-level', '3.0',
            // '-aspect', '9:16',
            '-force_key_frames', 'expr:gte(t,n_forced*2)',
            '-movflags', 'faststart',
            '-fflags', 'nobuffer',
            '-tune', 'zerolatency',
            '-acodec', 'aac',
            '-ab', '160k',
            '-ar', '44100',
            '-f', 'flv',
            'rtmps-url/secret-key-replaced'
        ])


  


  I have tried this command -use_wallclock_as_timestamps', '1' but it does nothing to error.