How to resolve ffmpeg error cannot load default config file?
Got it. The error is cuased by the font location in the command is of a Linux computer. The font location need to be different for windows.

The error caused by this line in the command: drawtext=fontfile=/usr/share/fonts/truetype/DroidSans.ttf

The above line does not work in Windows. 

For windows change to: drawtext=fontfile=/Windows/Fonts/arial.ttf