I can download some open source codec libraries, like
ffmpeg, why I need VIC libraries ?
First, when you use open source code, you may need to open your own code back
to the open source community; second, open-source library intends to build on
other third party libraries, or is very big by itself, and all modules are
tangled together. It is hard to extract one or two codec. Even when you only
need one or two codec, you have to include all of them.