EmguCV VideoWriter erstellt riesige Speicherdateien?

Question

Mit folgendem Code zeichne und speichere ich Videos von der Webcam auf die Festplatte. Aber selbst ein 3-Sekunden-Video speichert mit einer Dateigröße von etwa 50 MB. Ich nehme an, ich missbrauche die VideoWriter-Klasse. Irgendwelche Vorschläge?

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms; 
using Emgu.CV; 
using Emgu.CV.Structure; 

namespace EmguCV_Webcam 
{ 
    public partial class Form1 : Form 
    { 

     #region Private variables 

     private Capture currentDevice; 
     private VideoWriter videoWriter; 
     private bool recording; 
     private int videoWidth; 
     private int videoHeight; 

     #endregion 

     #region Constructors 

     public Form1() 
     { 
      InitializeComponent(); 
      InitializeVariables(); 
      AttachButtonMacros(); 
      StartVideoFeed(); 
     } 


     #endregion 

     #region Methods 

     private void InitializeVariables() 
     { 
      currentDevice = new Capture(0); 
      recording = false; 
      videoWidth = currentDevice.Width; 
      videoHeight = currentDevice.Height;    
     } 

     private void StartVideoFeed() 
     { 
      currentDevice.Start(); 
      currentDevice.ImageGrabbed += CurrentDevice_ImageGrabbed; 
     } 

     private void AttachButtonMacros() 
     { 
      StartRecordingButton.Click += StartRecordingButton_Click; 
      StopRecordingButton.Click += StopRecordingButton_Click; 
     } 

     private void CurrentDevice_ImageGrabbed(object sender, EventArgs e) 
     { 
      Mat m = new Mat(); 
      currentDevice.Retrieve(m); 
      VideoPictureBox.Image = m.ToImage<Bgr, byte>().Bitmap; 
      if (recording && videoWriter != null) 
      { 
       videoWriter.Write(m); 
      } 
     } 

     private void StartRecordingButton_Click(object sender, EventArgs e) 
     { 
      recording = true; 
      SaveFileDialog dialog = new SaveFileDialog(); 
      dialog.DefaultExt = ".avi"; 
      dialog.AddExtension = true; 
      dialog.FileName = DateTime.Now.ToString(); 
      DialogResult dialogResult = dialog.ShowDialog(); 
      if(dialogResult != DialogResult.OK) 
      { 
       return; 
      } 
      videoWriter = new VideoWriter(dialog.FileName, 30, new Size(videoWidth, videoHeight), true); 
     } 

     private void StopRecordingButton_Click(object sender, EventArgs e) 
     { 
      recording = false; 
      if(videoWriter != null) 
      { 
       videoWriter.Dispose(); 
      }   
     } 

     #endregion 

    } 
} 

Answer 1

Sie sollten die Komprimierung verwenden. Try this

VideoWriter.Fourcc('M', 'P', '4', 'V') 

ändern So

videoWriter = new VideoWriter(dialog.FileName, 30, new Size(videoWidth, videoHeight), true); 

mit

videoWriter = new VideoWriter(dialog.FileName, VideoWriter.Fourcc('M', 'P', '4', 'V'), 30, new Size(videoWidth, videoHeight), true);