stitching_detailed problem

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Hey!!

I am having a problem using the source code of opencv 2.4.12 to stitch a sequence of images into a panorama, called stitching_detailed.cpp that come in the source code folder. I'm trying to stitch 14 images but for some sequences the Bundle Adjustment fails and it can not update the parameters of all camera conveniently filling the focal length of all cameras with undefined values ​​and the result of the entire panorama creation process is a 1x1 pixel black image.

Could anyone help me with this problem?

Thanks in advance for your help. It is much appreciated.