How to green screen with FFMPEG | Chroma key a transparent video | FFMPEG tutorial
Today, we show how to green screen / chroma key transforming a video shot in front of a green screen into a transparent one that we will add on a background video. All parameters can be of course customized to suit your needs.
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EXAMPLE
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→ ffmpeg -i bg.mp4 -i fg.mp4 -filter_complex "[1:v]colorkey=57c273:0.3:0.01[tmp];[0:v][tmp]overlay" output01.mp4
with:
-i bg.mp4 = Reads background video file «bg.mp4», …
-i fg.mp4 = … and foreground video file «fg.mp4» …
-filter_complex = … and starts a series of complex filters…
[1:v]colorkey = … starting by calling the colorkey filter to define the transparent color for fg.mp4 ([1:v])…
57c273 = … as 57c273 (GREEN)… Note: update to match your color
0.3:0.01[tmp] = … with a similarity of 0.3 and a blending of 0.01 (Note: You may need to experiment with those values), calling the result [tmp]…
[0:v][tmp]overlay = … and overlays thereafter, [tmp] on top of the background video [0:v]
output01.mp4 = … outputting the final result to file «output01.mp4»
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MUSIC
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