I ran some tests on my computer and Pyglet can find the dll if they are 
added to the PATH. See the following tests where I add the path to the dll 
to my PATH and then invoke a Python interpreter to find it.

C:\Users\DANIELG>set 
PATH=%PATH%;C:\OfflineFiles\Python\pyglet_src\examples\lib

C:\Users\DANIELG>py -3
Python 3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:54:40) [MSC v.1900 64 bit 
(AMD64)]
 on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from ctypes.util import find_library
>>> find_library("avcodec-57")
'C:\\OfflineFiles\\Python\\pyglet_src\\examples\\lib\\avcodec-57.dll'

Maybe you could try to run the same script to find out if your dll can be 
found. If not, I would dig into that Microsoft article I linked above.

Let us know how it goes.

Daniel

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