I tried a stitch using every other image.
I tried that, too. It still produced errors. The one on the right 6th pew was not as severe, but was present. There were a number of other errors, although quite small. With all 24 images, those others were gone or too small for me to even see. I did it with the ODD images. I'll try again with the EVEN images and see how that goes.
It is apparent that these images were not shot at regular yaw intervals.
I guess you did not use a click-stop pano head?
Perhaps you are using a standard tripod head rather than a pano head and estimating yaw intervals by eye?
If you are not using a proper pano head with camera/lens set at the NPP then you will get parallax errors - resulting in stitch errors in rendered pano - when shooting this sort of interior scene.
A proper pano head would also facilitate mounting the camera in a portrait orientation gving you a greater vertical FOV.
It is a 3D head with 15 degree markings. The yaw error is the amount of error that results from manually adjusting the head to mate the markings visually. It should "accumulate" to 15 degree steps, but with jitter of maybe a degree or two.
I was considering cropping each of the 24 images to half width. But then, there would either be no EXIF data, or the data would not correctly represent the image.
If there were stitching errors all around the place, I could more easily understand the error involved. But with Smartblend, there is only that one severe one (6th to 8th pew) and the little one right next to it (6th pew only).
The head does allow me to get close to centering the entrance pupil. It's about 2cm in front of the center (e.g. the yaw axis runs up through the lens axis at about 2cm behind the entrance pupil).
I'm still looking for a pano head. I am looking first for one that mounts on my tripod in place of the head that is there now. So far, nothing found. The tripod to head mount may be proprietary to Bogen. I guess I should start looking for other mount heads. Any suggestions from what is sold at B&H (for now I buy everything from there).
I should also have shot that in portrait mode instead of landscape mode. But I had time pressure as the musicians were to start practice soon giving me only a 20 minute window to level the tripod on the slanted floor and make all the long exposures with the given lightning level. After that, people would be arriving for the Christmas church service. Otherwise I would have shot 72 images at 5 degree steps knowing I can always throw away any excess and try the stitching with whatever interval worked OK. For example, maybe every 20 degrees would have worked best (but I can't do that now). I have done 5 degree (visually estimating 1/3 of the 15 degree marks) and those stitches came out fine. But that was done with much better lightning and more details. I've also done 7.5 degree. All have been done on the same head, so there is always some jitter in the yaw positioning.
I did try doing a stitch by omitting just the ONE image that had the bad stitch on it's right edge. That sure came out in a mess. I guess it really needs some consistency to get a good stitch. If I could do some geometric distortion around that bad stitch point, I'm sure I could make it better. I can visualize in my head the distortion that would fix it (a partial quadrant rotation in 2 of the images there).
It would seem to me if I put control points along the edges of the pews, that should at least get things closer. But those are relative smooth parts of the image so I assume automatic control points would not be placed there.
Are those videos available as straight video files? Flash won't run on my browser (due to a multi-process mode in the browser, the Flash installer gets confused). If the video is on Youtube, then I can view it there (those are directly downloadable in most of the formats found there).