Checked in Andrew's patch and updated openjpeg-2.4.0 after testing on Ubuntu 16 -- just little tests but it does seem a little faster to render Jpeg Sequence (4.027 versus 4.169 on a small 1'30' video).

Andrea/Walter -- if you have time could you GIT pull and rebuild and make a small test too?

I did get openjpeg-2.4.0 built and the results look good, but I still want to test on an older distro yet tomorrow. Thanks for the hints.

I think I had patch for building new nasm as thirdparty (attached)
do not forgot to add nasm's tar.gz into thirdparty/src
if you want to test this too ....

Still time for me to test this toda!