OpenCVSharp VideoWriter Issue

[DhananjayHuidrom]

Summary of your issue

Failed to create a video file from live ip camer. Please help.

Environment

C#, visual studio 2019, .net core 3.1, OpenCvSharp4 (4.5.1.20210208)

Issue / problem?

1) .mjpg: Video is created with size of 0 kb 2) .avi: Video is failed to create

Example code:

const string OutVideoFile = "E:\output.mjpg"; var url = "rtsp://user:pass@ipaddress:554/cam/realmonitor?channel=1&subtype=0"; OpenCvSharp.Size dsize = new OpenCvSharp.Size(640, 480); VideoCapture capture = new VideoCapture(url); using (VideoWriter writer = new VideoWriter(OutVideoFile, FourCC.MJPG, 25, dsize)) { if(writer.IsOpened() == false) { Console.WriteLine("Failed to open writer."); return; }

            Console.WriteLine("Converting each movie frames...");
            Mat frame = new Mat();
            while (true)
            {
                // Read image
                capture.Read(frame);
                if (frame.Empty() || capture.PosFrames > 100)
                {
                    writer.Release();
                    break;
                }
                //Cv2.ImShow("v", frame);
                Console.CursorLeft = 0;
                Console.Write("{0} / {1}", capture.PosFrames, capture.FrameCount); 
                writer.Write(frame);
                Cv2.WaitKey(50);
            }
            Console.WriteLine();
        }

Output:

OpenCV: FFMPEG: tag 0x47504a4d/'MJPG' is not supported with codec id 7 and format 'mjpeg / raw MJPEG video'

What did you intend to be?

[stale[bot]]

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