I compared the aspect ratio to the official blu-ray, and if you change the height to 95% it matches perfectly. That is 1920x1026, or 1920x764 without black bars.
I also suspect that since the black bars are all at RGB 16/16/16 that the jpg's have gone through a faulty conversion from 16-235 to 0-255.
After fixing that and the aspect ratio it looks like this:
