How to Create a Negative Video Effect with FFmpeg

This article provides a quick, step-by-step guide on how to use the FFmpeg negate video filter to invert the colors of a video, creating a classic negative film effect. You will learn the basic command to invert video colors, how to handle transparency during the negation process, and how to combine the filter with other adjustments for a more polished look.

The Basic Negate Command

To invert the colors of a video and create a negative film effect, you use the video filter graph (-vf) with the negate filter. The basic command structure is as follows:

ffmpeg -i input.mp4 -vf "negate" output.mp4

In this command:

  • -i input.mp4 specifies your source video file.
  • -vf "negate" applies the video filter that inverts all color channels (RGB).
  • output.mp4 is the name of the resulting video file.

Preserving the Alpha (Transparency) Channel

By default, the negate filter inverts all components of the video, including the alpha (transparency) channel if one is present. If you want to invert the colors of a transparent video (like a ProRes4444 or WebM file) without making the transparent background solid, you must disable alpha negation.

Use the negate_alpha parameter set to 0:

ffmpeg -i input.mov -vf "negate=negate_alpha=0" output.mov

Setting negate_alpha=0 ensures that only the visible RGB colors are inverted, while your transparency masks remain intact.

Adjusting Contrast and Brightness for a Film Look

An actual negative film strip often has different contrast and brightness levels than a simple digital inversion. To make the negative effect look more realistic, you can chain the negate filter with the eq (equation) filter to adjust brightness, contrast, and saturation.

ffmpeg -i input.mp4 -vf "negate,eq=contrast=1.2:brightness=-0.05:saturation=0.8" output.mp4

In this example:

  • negate inverts the colors first.
  • eq=contrast=1.2 increases the contrast to make the whites and blacks pop.
  • brightness=-0.05 slightly darkens the image to prevent blown-out highlights.
  • saturation=0.8 desaturates the colors slightly to mimic aged film stock.