Convert Video to Grayscale

By  on  

I'm a JavaScript fanatic but I've always been fascinated with media manipulation. Maybe it's because I've secretly always wanted to be a designer, but I'm fine with being able to manipulate art with software instead of create the art myself. One type of art I've always enjoyed was black and white (/grayscale) video.

To convert a video to black and white, you can utilize ffmpeg with a few simple arguments:

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

The preceding command turns this color video:

... to the following grayscale video:

If you were to search ffmpeg on this blog, you'd find dozens of tutorials about how amazing the tool is. Play around with ffmpeg and let me know what awesomeness you come up with!

Recent Features

  • By
    Regular Expressions for the Rest of Us

    Sooner or later you'll run across a regular expression. With their cryptic syntax, confusing documentation and massive learning curve, most developers settle for copying and pasting them from StackOverflow and hoping they work. But what if you could decode regular expressions and harness their power? In...

  • By
    Write Better JavaScript with Promises

    You've probably heard the talk around the water cooler about how promises are the future. All of the cool kids are using them, but you don't see what makes them so special. Can't you just use a callback? What's the big deal? In this article, we'll...

Incredible Demos

  • By
    HTML5’s placeholder Attribute

    HTML5 has introduced many features to the browser;  some HTML-based, some in the form of JavaScript APIs, but all of them useful.  One of my favorites if the introduction of the placeholder attribute to INPUT elements.  The placeholder attribute shows text in a field until the...

  • By
    Image Data URIs with PHP

    If you troll page markup like me, you've no doubt seen the use of data URI's within image src attributes. Instead of providing a traditional address to the image, the image file data is base64-encoded and stuffed within the src attribute. Doing so saves...

Discussion

  1. Nice, ffmpeg seems to be quite handy!

    Btw the same effect may be achieved on the client using CSS grayscale-filter, which is nowadays supported by any major browser (but IE). E.g. https://codepen.io/MattDiMu/pen/pBqQqR

    Doing this on the client-side, however, will probably result in much larger file sizes than necessary, as grayscale videos offer much better compression. In your example the difference is 399kB vs 270kB.

  2. Tom Gallagher

    I noticed the file size difference as well.

    David, could you confirm that just adding -vf hue=s=0 reduced the file size by 129KB, there were no other transformations?

    Thanks

    • Denis

      In my case, the file size dropped to 1/3 of original file.

  3. Hey David! Since there is difference between BLACK AND WHITE filter and GRAYSCALE filter.

    A truly black and white image would simply consist of two colors—black and white. Grayscale images are created from black, white, and the entire scale of shades of gray.

    Is method you mentioned rather grayscale? Or rather black and white filter?

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!