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Background:

When you turn pixels transparent, you're in fact just setting the alpha value of a pixel to 00. Said pixel can still have an arbitrary colour, no matter if it's green, blue, black or something completely different.

My question:

I got a video that's having a lot of "transparent-green" pixels, that all have the RGBA colour 00D70000. I need a way to convert all those transparent-green pixels into transparent-black, with the RGBA value 00000000.

How would I accomplish this using ffmpeg? Other command line tools would be fine as well, as long as they aren't a hassle to set up...

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  • Can you please share more details? What type of codec and container are you using? (I was thinking about vp9 and WebM, but then the pixel format is yuva420p, not rgba). Is there any video input sample we can download? Do you want to convert only the transparent-green pixels to transparent-black, or all the transparent pixels to transparent-black? Are there any semi-transparent pixels?
    – Rotem
    Jan 23, 2022 at 21:54
  • I was thinking about a solution. Are you no longer interested?
    – Rotem
    Feb 2, 2022 at 17:30

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