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submitted 2 months ago by als@lemmy.blahaj.zone to c/opensource@lemmy.ml
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[-] ElcaineVolta@kbin.melroy.org 303 points 2 months ago
[-] Dagnet@lemmy.world 116 points 2 months ago

Its insane just how important it is and the vast majority of the world doesn't even know it exists. Truly unsung heroes (everyone who works on it).

[-] captain_aggravated@sh.itjust.works 47 points 2 months ago

I'm surprised nobody posted the xkcd comic. I think Randall had ImageMagick in mind (he names it in the alt text) but it applies to ffmpeg as well.

[-] tempest@lemmy.ca 25 points 2 months ago

I always used to think about curl when I see that comic. Maybe less important in recent years but still a corner stone.

[-] msage@programming.dev 3 points 2 months ago

Curl is less important in the cloudverse?

[-] CrabAndBroom@lemmy.ml 15 points 2 months ago
[-] CheeseNoodle@lemmy.world 3 points 2 months ago

At this point that picture should be multiple layers of precariously stacked tiny pillars making up the entire base.

[-] 0x0@lemmy.zip 3 points 2 months ago

Kinda like curl.

[-] HuntressHimbo@lemmy.zip 66 points 2 months ago

Ffmpeg has been such cool software to learn. Simple filter chains can do incredible things

[-] some_designer_dude@lemmy.world 24 points 2 months ago
[-] HuntressHimbo@lemmy.zip 36 points 2 months ago

Well for instance you can use it to apply tranparencys or other effects using the geq filter. It applies a formula to every pixel in the input and can adjust alpha, rgb values, and gamma. You can also use conditionals in your formula and have access to the current pixels location and value, so you can apply your transforms only to specific regions if you want, or do an adjustment keyed only to a specific color.

[-] PieMePlenty@lemmy.world 7 points 2 months ago

You're talking about green screen right? :D

[-] BubbleMonkey@slrpnk.net 13 points 2 months ago

Have you seen this? Green screen on crack.

https://m.youtube.com/watch?v=UQuIVsNzqDk

[-] HuntressHimbo@lemmy.zip 3 points 2 months ago* (last edited 2 months ago)

That and more really. You could use it to do a green screen effect, but you can also use it to adjust color balance, brightness or do weirder things like swapping values between colors. It gets really crazy when you are working with full video because the time of the current frame is also available to be incorporated, so you can even do animated effects.

Another powerful filter is the convolve filter. That allows you to apply matrix transformations, which can for example be used to apply a homography matrix and adjust a videos perspective.

this post was submitted on 11 Nov 2025
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