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I have a task to label video frames. I need to mark all odd frames of a video with green pixels and even ones with red pixels. I do this in two steps:

ffmpeg -i video.mp4 -filter_complex "drawbox=x=0:y=0:w=5:h=3:color=#ff0000:t=fill:enable='not(mod(n,2))'" green.mp4

ffmpeg -i green.mp4 -filter_complex "drawbox=x=0:y=0:w=5:h=3:color=#00ff00:t=fill:enable='mod(n,2)'" greenred.mp4

Can you please tell me how to combine this into one step?

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  • Hi Dmitry - please post future questions in English, as this site is English speaking only. I used google translate for you this time.
    – Dr Mayhem ♦
    Commented Dec 1 at 8:50

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Simply chain the filters in a sequence.

ffmpeg -i video.mp4 -vf "drawbox=x=0:y=0:w=5:h=3:color=#ff0000:t=fill:enable='not(mod(n,2))',drawbox=x=0:y=0:w=5:h=3:color=#00ff00:t=fill:enable='mod(n,2)'" greenred.mp4

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