Try this:
]add https://github.com/giordano/DependencyWalker.jl
using Plots # this will result in an error, it's ok
using DependencyWalker
Library(raw"C:\Users\frpa8185\.julia\artifacts\ecb81e6429c089c1da802644fae337754832d534\bin\avcodec-58.dll")
The last command should show which library can’t be found.