I am trying to save the image from the camera as mp4(etc) on WPF application. But so far I have not been successful. Thanks for your help.

CodePudding user response：

Sorry for my bad english at first.I am receiving the image from the webcam. Below are the codes.

public partial class MainWindow : Window { private FilterInfoCollection cihazlar; private VideoCaptureDevice yakala_resim ; public MainWindow() { InitializeComponent(); cihazlar = new FilterInfoCollection(FilterCategory.VideoInputDevice); foreach (FilterInfo device in cihazlar) { kameralar.Items.Add(device.Name); kameralar.SelectedIndex = 2; } }

    private void Başla_Click(object sender, RoutedEventArgs e)
    {
        yakala_resim = new VideoCaptureDevice(cihazlar[kameralar.SelectedIndex].MonikerString);
        yakala_resim.NewFrame  = Yakala_NewFrame1;
        yakala_resim.Start(); 
    }

    private void Yakala_NewFrame1(object sender, NewFrameEventArgs eventArgs)
    {
        try
        {
            BitmapImage bi;
            using (var bitmap = (Bitmap)eventArgs.Frame.Clone())
            {
                bi = bitmap.ToBitmapImage();
            }
            bi.Freeze();
            Dispatcher.BeginInvoke(new ThreadStart(delegate { video.Source = bi; })); 
        }
        catch (Exception)
        {

            
        }

    }

no problem currently. But I don't know what to do when I want to save the image come from webcam as mp4.

CodePudding user response：

You can use from OpenCvSharp

namespace BlackBears.Recording
{
    using System;
    using System.Drawing;
    using System.Threading;

    using OpenCvSharp;
    using OpenCvSharp.Extensions;

    using Size = OpenCvSharp.Size;

    public class Recorder : IDisposable
    {
        private readonly VideoCaptureAPIs _videoCaptureApi = VideoCaptureAPIs.DSHOW;
        private readonly ManualResetEventSlim _writerReset = new(false);
        private readonly VideoCapture _videoCapture;
        private VideoWriter _videoWriter;
        private Thread _writerThread;

        private bool IsVideoCaptureValid => _videoCapture is not null && _videoCapture.IsOpened();

        public Recorder(int deviceIndex, int frameWidth, int frameHeight, double fps)
        {
            _videoCapture = VideoCapture.FromCamera(deviceIndex, _videoCaptureApi);
            _videoCapture.Open(deviceIndex, _videoCaptureApi);

            _videoCapture.FrameWidth = frameWidth;
            _videoCapture.FrameHeight = frameHeight;
            _videoCapture.Fps = fps;
        }

        /// <inheritdoc />
        public void Dispose()
        {
            GC.SuppressFinalize(this);
            Dispose(true);
        }

        ~Recorder()
        {
            Dispose(false);
        }

        protected virtual void Dispose(bool disposing)
        {
            if (disposing)
            {
                StopRecording();

                _videoCapture?.Release();
                _videoCapture?.Dispose();
            }
        }

        public void StartRecording(string path)
        {
            if (_writerThread is not null)
                return;

            if (!IsVideoCaptureValid)
                ThrowHelper.ThrowVideoCaptureNotReadyException();

            _videoWriter = new VideoWriter(path, FourCC.XVID, _videoCapture.Fps, new Size(_videoCapture.FrameWidth, _videoCapture.FrameHeight));

            _writerReset.Reset();
            _writerThread = new Thread(AddCameraFrameToRecordingThread);
            _writerThread.Start();
        }

        public void StopRecording()
        {
            if (_writerThread is not null)
            {
                _writerReset.Set();
                _writerThread.Join();
                _writerThread = null;
                _writerReset.Reset();
            }

            _videoWriter?.Release();
            _videoWriter?.Dispose();
            _videoWriter = null;
        }

        private void AddCameraFrameToRecordingThread()
        {
            var waitTimeBetweenFrames = (int)(1_000 / _videoCapture.Fps);
            using var frame = new Mat();
            while (!_writerReset.Wait(waitTimeBetweenFrames))
            {
                if (!_videoCapture.Read(frame))
                    return;
                _videoWriter.Write(frame);
            }
        }
    }
}

Recording Video from Webcam with OpenCvSharp - Resulting File playback to fast