install FFMPEG on windows OS

[maRce10]

Describe the bug
scrolling_spectro() needs to be tested on windows OS

[ronaldehido]

Installing FFMPEG on Windows to run scrolling_spectro()

--Download the appropriate version for your Windows OS:

1. Download static build of FFMPEG for Windows in .ZIP from https://github.com/BtbN/FFmpeg-Builds/releases
   (it should contain the BIN folder)

--Adding to our System Path environment variables
2. Extract content in a folder in (C:). You could name the folder as “ffmpeg”.
3. Copy .EXE files into bin folder. It should be some like “C: /ffmpeg/bin”
4. Go to RUN and type the command: "SystemPropertiesAdvanced.exe" and select “Environment Variables…”
5. Select and edit the “Path” variable
6. Add a new variable and copy the path of bin directory “C: /ffmpeg/bin” and click on OK
7. Confirm that in System variables windows the variable PATHEXT include as value the .EXE extension or add if they are not included and OK

--run FFMPEG
8. Go to Command Prompt (CMD), run as administrator.
9. Write “ffmpeg” and ENTER. It should deploy FFMPEG information with services enabled.
Now FFMPEG is running in windows and you can run the code in R for “dynaSpec”

---

tested in Windows 10 x64
dynaSpec works.

[maRce10]

Thanks Ron!