public static void CopyMovieTexture()
    {
        var mt = (MovieTexture)Selection.activeObject;

        if (mt == null)
        {
            return;
        }
        var newMt = MovieTexture.Instantiate <MovieTexture> (mt);

        AssetDatabase.CreateAsset(newMt, "Assets/" + newMt.name + "mt.asset");
        AssetDatabase.SaveAssets();
        AssetDatabase.Refresh();
    }