Image overlay

Video Capture SDK .Net Video Edit SDK .Net Media Player SDK .Net Media Blocks SDK .Net

VideoCaptureCore MediaPlayerCore VideoEditCore

Introduction

This example demonstrates how to overlay an image on a video stream.

JPG, PNG, BMP, and GIF images are supported.

Sample code

Most simple image overlay with image added from a file with custom position:

 var effect = new VideoEffectImageLogo(true, "imageoverlay");
 effect.Filename = @"logo.png";
 effect.Left = 100;
 effect.Top = 100;

 VideoCapture1.Video_Effects_Add(effect);

Transparent image overlay

SDK fully supports transparency in PNG images. If you want to set a custom transparency level, you can use the TransparencyLevel property with a range (0..255).

var effect = new VideoEffectImageLogo(true, "imageoverlay");
effect.Filename = @"logo.jpg";

effect.TransparencyLevel = 50;

VideoCapture1.Video_Effects_Add(effect);

Animated GIF overlay

You can overlay an animated GIF image on a video stream. The SDK will play the GIF animation in the overlay.

var effect = new VideoEffectImageLogo(true, "imageoverlay");
effect.Filename = @"animated.gif";

effect.Animated = true;
effect.AnimationEnabled = true;

VideoCapture1.Video_Effects_Add(effect);

Image overlay from System.Drawing.Bitmap

You can overlay an image from a System.Drawing.Bitmap object.

var effect = new VideoEffectImageLogo(true, "imageoverlay");
effect.MemoryBitmap = new Bitmap("logo.jpg");
VideoCapture1.Video_Effects_Add(effect);

Image overlay from RGB/RGBA byte array

You can overlay an image from RGB/RGBA data.

// add image logo
var effect = new VideoEffectImageLogo(true, "imageoverlay");

// load image from JPG file
var bitmap = new Bitmap("logo.jpg");

// lock bitmap data and save to byte data (IntPtr)
var bitmapData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
var pixels = Marshal.AllocCoTaskMem(bitmapData.Stride * bitmapData.Height);
NativeAPI.CopyMemory(pixels, bitmapData.Scan0, bitmapData.Stride * bitmapData.Height);
bitmap.UnlockBits(bitmapData);

// set data to effect
effect.Bitmap = pixels;

// set bitmap properties
effect.BitmapWidth = bitmap.Width;
effect.BitmapHeight = bitmap.Height;
effect.BitmapDepth = 3; // RGB24

// free bitmap
bitmap.Dispose();

// add effect
VideoCapture1.Video_Effects_Add(effect);

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