Video Renderer Selection Guide for TVFVideoCapture¶

Overview of Available Renderers¶

When developing video capture applications with TVFVideoCapture, selecting the appropriate video renderer significantly impacts performance and compatibility. This guide provides detailed implementation examples for the three available renderer options in Delphi, C++, and VB6 environments.

Standard Video Renderer¶

The standard Video Renderer utilizes GDI for drawing operations. This renderer option is primarily recommended for:

Legacy systems
Environments where Direct3D acceleration is unavailable
Maximum compatibility with older hardware

// Delphi
VideoCapture1.Video_Renderer := VR_VideoRenderer;

// C++ MFC
m_VideoCapture.SetVideo_Renderer(VR_VideoRenderer);

' VB6
VideoCapture1.Video_Renderer = VR_VideoRenderer

Video Mixing Renderer 9 (VMR9)¶

VMR9 represents a modern filtering solution capable of leveraging GPU capabilities for enhanced rendering. Key advantages include:

Hardware-accelerated video processing
Advanced deinterlacing options
Improved performance for high-resolution content

// Delphi
VideoCapture1.Video_Renderer := VR_VMR9;

// C++ MFC
m_VideoCapture.SetVideo_Renderer(VR_VMR9);

' VB6
VideoCapture1.Video_Renderer = VR_VMR9

Accessing Deinterlacing Modes¶

VMR9 supports multiple deinterlacing techniques. The following code demonstrates how to retrieve available deinterlacing options:

// Delphi
VideoCapture1.Video_Renderer_Deinterlace_Modes_Fill;
for I := 0 to VideoCapture1.Video_Renderer_Deinterlace_Modes_GetCount - 1 do
  cbDeinterlaceModes.Items.Add(VideoCapture1.Video_Renderer_Deinterlace_Modes_GetItem(i));

// C++ MFC
m_VideoCapture.Video_Renderer_Deinterlace_Modes_Fill();
for (int i = 0; i < m_VideoCapture.GetVideo_Renderer_Deinterlace_Modes_GetCount(); i++) {
    m_DeinterlaceCombo.AddString(m_VideoCapture.GetVideo_Renderer_Deinterlace_Modes_GetItem(i));
}

' VB6
VideoCapture1.Video_Renderer_Deinterlace_Modes_Fill
For i = 0 To VideoCapture1.Video_Renderer_Deinterlace_Modes_GetCount - 1
    cboDeinterlaceModes.AddItem VideoCapture1.Video_Renderer_Deinterlace_Modes_GetItem(i)
Next i

Enhanced Video Renderer (EVR)¶

EVR is the recommended renderer for modern Windows environments (Vista and later). This advanced renderer provides:

Superior video acceleration capabilities
Optimal performance on Windows 7/10/11
Better resource utilization

// Delphi
VideoCapture1.Video_Renderer := VR_EVR;

// C++ MFC
m_VideoCapture.SetVideo_Renderer(VR_EVR);

' VB6
VideoCapture1.Video_Renderer = VR_EVR

Managing Aspect Ratio and Display Options¶

When displaying video content, you'll often need to handle aspect ratio differences between the source video and the display area.

Stretching the Video Image¶

To stretch the video to fill the entire display area:

// Delphi
VideoCapture1.Screen_Stretch := true;
VideoCapture1.Screen_Update;

// C++ MFC
m_VideoCapture.SetScreen_Stretch(true);
m_VideoCapture.Screen_Update();

' VB6
VideoCapture1.Screen_Stretch = True
VideoCapture1.Screen_Update

Using Letterbox Mode (Black Borders)¶

For preserving the original aspect ratio with black borders:

// Delphi
VideoCapture1.Screen_Stretch := false;
VideoCapture1.Screen_Update;

// C++ MFC
m_VideoCapture.SetScreen_Stretch(false);
m_VideoCapture.Screen_Update();

' VB6
VideoCapture1.Screen_Stretch = False
VideoCapture1.Screen_Update

Performance Considerations¶

When selecting a renderer for your application, consider these factors:

Target operating system version
Hardware capabilities of end-user systems
Video resolution and processing requirements
Compatibility needs for your deployment environment

Please get in touch with support if you need technical assistance with this implementation. Visit our GitHub repository for additional code samples and resources.