//Get frames from image file.
var image = Image.FromFile(file);
var dimension = new FrameDimension(image.FrameDimensionsList[0]);
var framesCount = image.GetFrameCount(dimension);
var frames = new Bitmap[framesCount];
for (int i = 0; i < framesCount; i++)
{
    var bitmap = new Bitmap(image.Width, image.Height);
    var graphics = Graphics.FromImage(bitmap);

    image.SelectActiveFrame(dimension, i);
    graphics.DrawImage(image, Point.Empty);
    frames[i] = bitmap;
}

//Get buffer data from bitmap frame.
using (var stream = new MemoryStream())
{
    bitmap.Save(stream, format);
    return stream.GetBuffer();
}

timer += speed * Time.deltaTime;
if (timer < 0 || timer > curve.Length)
{
    switch (loopMode)
    {
        case LoopMode.Once:
            Stop();
            return;

        case LoopMode.Loop:
            timer -= curve.Length * TimerDirection;
            break;

        case LoopMode.PingPong:
            speed = -speed;
            timer = Mathf.Clamp(timer, 0, curve.Length);
            break;
    }
}

var worldUp = Vector3.up;
switch (upMode)
{
    case UpMode.TransformUp:
        worldUp = transform.up;
        break;

    case UpMode.ReferenceUp:
        if (reference)
        {
            worldUp = reference.up;
        }
        break;

    case UpMode.ReferenceUpAsNormal:
        if (reference)
        {
            var tangent = (nextPos - timePos).normalized;
            worldUp = Vector3.Cross(tangent, reference.up);
        }
        break;
}