Working on bluray updated information and potential changes as I finally got my bluray burner working again.

Else I suggest that the # comments in the manual should be kept to explain what happends.

I am not sure what the above is referring to.  It sounds like "the # comments should be kept" means "no changes"?  If my interpretation is incorrect, please provide detailed information so I do not miss something.

And also how the mkudffs size was calculated.

I have included the actual calculation in section 14 (not checked into GIT yet) after the initial mention of mkudffs in the lines:

it creates an empty filesystem image <target>/bd.udfs using mkudffs which makes a big hole for the filesystem data. The hole is made just a little bigger than the data written by bdwrite...

Added line is:  "The actual calculation for the mkudffs size is yourfile.m2ts size-in-bytes/2048 + 4096."

In section 14.6, the calculation was already in the manual as:

du -sb /yourHDVfile.MTS         # Determine the size of your file in bytes.
blocks=((size-in-bytes/2048 + 4096))    # Convert bytes into blocks + a little more.
mkudffs /tmp/newfilename.udfs blocks    # Create a file with that \# of blocks + some extra.