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I am looking for way to extract frames from a video shot in front of a green screen. This is the source video, so nothing has been chroma keyed on to it yet. I want to save the frames as PNGs with the green replaced by transparent.

I see its possible to get transparent video based this question, but I am looking to save as transparent PNG's, not video.

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Assuming you are satisfied with the chroma key quality from ffmpeg, it's just

ffmpeg -i in.mp4 -vf chromakey={...} -vsync 0 out%d.png

where {...} is replaced with your chromakey filter arguments.

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