FFmpeg & Black and White Conversion

Question

How to convert a video to black and white using ffmpeg?

Answer 1

Desaturate

Use the hue filter if you want to desaturate:

ffmpeg -i input -vf hue=s=0 output

This is like using Colors → Saturation in the GIMP.

Grayscale

Use the format filter if you want to convert to grayscale format:

ffmpeg -i input -vf format=gray output

This is like using Image → Mode → Grayscale in the GIMP.

Threshold

See FFmpeg convert video to Black & White with threshold?

This is like using Colors → Threshold in the GIMP.