I thought it might be an offset issue, but after tooling about in gimp, I’m not so sure. What ‘should’ they look like 
The RGB data does seem to be RBG, the RGBA, I’m notsure. You said unsigned?
using imagemagick on the RGBA frames I get something like this using:
convert -size 1080x2520 -depth 16 -define quantum:format=usigned gray:frame050.data -auto-level result.png
Which probably needs an offset to get there but bits of sailfish logo can also be recognized. It does look unsigned judging from the results of the convert operation.