ImageData.Data Stride Estimation

[Scubaboy]

Hi,
I'm using FFMediaToolKit in a Unity 3D project to create videos of Unity's 3D scene. I'm capturing Unity's camera view as follows:

 _screenShot = new Texture2D(Screen.width, Screen.height, TextureFormat.RGB24, false);
 _captureCamera.targetTexture = _renderTexture;
 RenderTexture.active = _renderTexture;
 _screenShot.ReadPixels(new Rect(0,0,Screen.width, Screen.height),0,0);
 _screenShot.Apply();
var pixelData = _screenShot.GetRawTextureData();

The above code provides a byte array of raw pixel data. When I take the byte array and try to construct an 'ImageData' object

ImageData.FromArray(pixelData , ImagePixelFormat.Rgb24, Screen.width, Screen.height);

I get the following exception:

Pixel buffer size doesn't match size required by this image format.

You use the following formula to calculate the expected stride:

4 * (((GetBitsPerPixel(format) * width) + 31) / 32);

However the byte array generated by Unity is

Screen.Width x Screen.height x 3

3 bytes per pixel corresponding to the 'TextureFormat.RGB24'

Is there any course of action I can take to resolve this difference?