White frame before video plays in Unity instead of a custom thumbnail - unity3d

Question

I load a thumbnail before the video starts to play, but later when the video is playing, there is first a white frame and then the video is playing. How can I avoid this white frame??
Here is my code-
video.GetComponent<RawImage>().texture = thumbnailTex;
//Play the video:
RenderTexture rt = new RenderTexture(1920, 1080, 16, RenderTextureFormat.ARGB32);
rt.Create();
video.GetComponent<RawImage>().texture =rt;
video.GetComponent<RawImage>().targetTexture=rt;
video.GetComponent<VideoPlayer>().url = "www....";
video.GetComponent<VideoPlayer>().Play();
// white frame, and then the video is playing

Answer 1

You need to wait first and test if the video is ready to play
It would be better if it's not already to have the above code in a coroutine. What is happening is you call play before the player has had a chance to download/load the first frame. Then display your rendertexture.
video.GetComponent().url = "...";
video.GetComponent().Prepare();
while (!video.GetComponent().isPrepared)
yield return new WaitForEndOfFrame();
video.GetComponent().frame = 0; //just incase it's not at the first frame
video.GetComponent().Play();
//now display your render texture

Answer 2

Thanks you very much for this solution to avoid jump frames during the playing of a video!
But there are some changes to do :
In the "Start" function, I call a coroutine :
StartCoroutine(PrepareVideoCoroutine());
In this coroutine, I put :
while (!gameOverGlassVideo.GetComponent().isPrepared) {
gameOverGlassVideo.GetComponent<VideoPlayer>().Prepare();
yield return new WaitForEndOfFrame();
}
//::: I put the line to prepare the video in the condition and NOT
outside ::://
When I want to play the video after, it's was already prepared and there will be not jumping frames!