Add integration with ffmpeg as an optional dependency

[MarshalX]

Add methods for converting files, support for FIFO files for live broadcasts

FIFO: http://man7.org/linux/man-pages/man7/fifo.7.html
Tempfile for FIFO: https://stackoverflow.com/questions/1430446/create-a-temporary-fifo-named-pipe-in-python
ffmpeg for Python: https://github.com/kkroening/ffmpeg-python
Optional deps of package: https://setuptools.readthedocs.io/en/latest/userguide/dependency_management.html?highlight=extras_require#optional-dependencies

[roj1512]

@MarshalX can’t wait...

[Sunda001]

@MarshalX can’t wait...

same

[hdcola]

#93 This might work out just fine

[MarshalX]

This issue is deprecated and will not be implemented. If will there is auto transcoding in the library, then through ffmpeg from the C++ side. Not from Python