https://bugs.winehq.org/show_bug.cgi?id=52908
--- Comment #6 from RĂ©mi Bernon rbernon@codeweavers.com --- It's not really that it's hard to handle, but from the test PoV it's easier if the error is caught early, without having to worry about validating each possible case where it may fail. Otherwise any future change to the test call sequence will possibly break this again.
On Windows the transform may not be there either (I guess, if somehow you can uninstall codecs), and it will also fail to enumerate (rather than fail to create probably, but it's hopefully okay). Then I don't think it would later fail spuriously like how a missing GStreamer plugin does for us.