How to setup dub project for contributing to a dub package?

[Richard (Rikki) Andrew Cattermole]

First things first, dcv is added to the dub-registry, so use this.

https://code.dlang.org/packages/dcv

```json
"dependencies": {
	"dcv": "~>0.3.0"
}
```

For ffmpeg the binding tells you what to add for search paths in the 
lflags directive.

https://github.com/ljubobratovicrelja/ffmpeg-d#adding-to-dub

All I can suggest is make sure you have the right dev packages for 
ffmpeg installed and findable by the linker.