Video library DLLs not found in Windows 10

I have just installed Processing 4.3.4 x86-64 on my Windows 10 i7 laptop. It is installed at
\Users\David\Processing4.3.4\processing.exe
I installed the Video library for Processing 4 from the Manage Libraries dialog.
I am attempting to run the videoSDcard sketch from pjrc.com
This sketch fails with message:
can’t load library avcodec-58 (avcodec-58|libavcodec-58|libavcodec-58-0) with -Djna.library.path=C:\Program Files\gstreamer\1.0\msvc_x86_64\bin. Last error:java.lang.UnsatisfiedLinkError: Unable to load library ‘avcodec-58’:

The file avcodec-58.dll does exist in the path
\Users\David\Processing\libraries\video\library\windows-amd64
but is not being found by Processing.

How can I resolve this problem?