ffmpeg how to convert a video to black and white

Written by John Riselvato - original link

Turning a video to black and white is also accomplished by using the hue filter. 

{width=“436” height=“240”}

Setting the saturation value to 0 results in a black and white video, as seen in figure 58.0:

$ ffmpeg -i input.mp4 -vf "hue=s=0" output.mp4

Challenge: In addition to changing the video to black and white, add a grain filter to make the video look vintage.