I see that you are using an awkward texture size. Textures should always be a power of 2. 448x320 is screwy. Texture sizes must be 8, 16, 32, 64, 128, 256, 512, 1024, 2048, or 4096 pixels on a side. They can be mixed and matched (that is, you can have rectangles), but the dimensions need to use these numbers. The nearest valid size is 512x256 (applying the logarithmic scale used).