Since version 1.8.12 HDF5 provides a new mechanism to register custom filters to the library. Though it was possible to use custom filters prior to the 1.8.12 release the original mechanism would have had required changes to the code of the application which wanted to use the filter. Consequently this ruled out all commercial applications where the source code is typically not available.
With HDF5 1.8.12 it is now possible to install custom filters as shared objects which are loaded by the library automatically whenever it encounters a dataset where a custom filter was applied to the stored data without touching the code of the application reading the file. Thus commercial applications can now access those files and open source applications benefit from this feature as they do not need to be recompiled whenever a new filter becomes available.
This site guides you through the installation procedure for the external filter modules on Windows and Linux. No OSX version is currently available though.
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