我目前在使用AForge dll将视频渲染到图片框中进行实时查看。我具有一个视频帧功能,可以将当前图片框帧作为JPG格式的WriteFrame或屏幕截图。但是,有时程序会提示“参数无效”或“对象已在其他地方使用”的错误。我尝试寻找解决方案,确信已对图像和克隆图像进行了处理,但问题仍然存在。您能帮助我确定我的程序哪里做错了吗?
void videoSource_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
//your code using bmp object
if (D1Pic.BackColor == Color.Green)
{
video = (Bitmap)eventArgs.Frame.Clone();
if (livePreview.Image != null)
{
//Dispose the resources
this.Invoke(new MethodInvoker(delegate() { livePreview.Image.Dispose(); }));
}
livePreview.Image = (Bitmap)eventArgs.Frame.Clone();
imgclone = (Image)livePreview.Image.Clone();
FileWriter.WriteVideoFrame(video);
}
else
{
video = (Bitmap)eventArgs.Frame.Clone();
if (livePreview.Image != null)
{
//Dispose the resources
this.Invoke(new MethodInvoker(delegate() { livePreview.Image.Dispose(); }));
this.Invoke(new MethodInvoker(delegate() { video.Dispose(); }));
}
livePreview.Image = (Bitmap)eventArgs.Frame.Clone();
imgclone = (Image)livePreview.Image.Clone();
}
video.Dispose();
livePreview.Refresh();
以下是堆栈跟踪错误:
{"Parameter is not valid."}
at System.Drawing.Image.get_Width()
at System.Windows.Forms.PictureBox.ImageRectangleFromSizeMode(PictureBoxSizeMode mode)
at System.Windows.Forms.PictureBox.OnPaint(PaintEventArgs pe)
at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)
at System.Windows.Forms.Control.WmPaint(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
更新的代码:
var newFrame = (Bitmap)eventArgs.Frame.Clone();
this.Invoke(new MethodInvoker(delegate()
{
if (livePreview.Image != null)
{
livePreview.Image.Dispose();
}
livePreview.Image = newFrame;
}));
imgclone = (Bitmap)eventArgs.Frame.Clone();
//Write frame into video
if (D1Pic.BackColor == Color.Green)
{
video = (Bitmap)eventArgs.Frame.Clone();
FileWriter.WriteVideoFrame(video);
}
livePreview.Invalidate()
。 - Jeremy Thompson