Can't pass value-less options?

Created by: ceptonit

Some ffmpeg options don't take any values. In this example '-an' (it's the disable audio option). So how can we pass them on?

with: input_stream = ffmpeg.input('input.mp4')

I tried: output_stream = ffmpeg.output(input_stream, 'output.mp4', 'an') output_stream = ffmpeg.output(input_stream, 'output.mp4', an='') output_stream = ffmpeg.output(input_stream, 'output.mp4', **{'an': ''})

None of the 3 worked.