Doc: describe how to speed-up jpeg2000 encoding
Multi-threaded encoding is only available in "recent" openjpeg versions.
For installations not using conda and with an "obsolete" OS (Ubuntu 20.04), some tweaks are needed to make it work.
Multi-threaded encoding is only available in "recent" openjpeg versions.
For installations not using conda and with an "obsolete" OS (Ubuntu 20.04), some tweaks are needed to make it work.