Fancy stitching with VRWorks

Hi,

I wanted to stitch images between them using the framework VRWorks Video 360
For example, I want to stitch those two images between them:

The result of stiching would be:

But, when I use the framework VRWorks Video, the generated image is very little with low resolution as we can see below

I wanted to know what is the problem and how parameters may to be set to get a fully stitched image without distorsion.

Thanks,