Having used Firebird SQL and Delphi for years I have always registered my own Blob Filters using FBPlus from Devrace.
As Delphi now ships with FireDac I am hoping to shift over to this technology, removing the requirement of third party data access components.
Has anyone any experience with registering Firebird SQL Blob filters in FireDac? Though I can simply access the fields as binary data and run through the routines for decompression etc, I would rather have access on a field level through the engine.
Firebird blob filters are serverside (to convert one type of blob to another), and registering them is just executing the DDL you linked to. It sounds like FBPlus also supports blob filters clientside (as confirmed by your comment), which is - afaik - not a standard Firebird feature.
You will need to replicate this feature by calling the blob filter yourself in your code.