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Key out a flat colour with FFmpeg colorkey and composite it over a background
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What this guide covers
For editors with a green-screen or other flat-colour backdrop who want a command-line key. You end with the backdrop made transparent and the clip composited over a background, tuned from the manual's starting values. Based on the FFmpeg manual and not run, so real key quality is unknown.
More about this guide
Guide ID: art_01M6VVETD135K21TM11P6QVC8V
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Guide title
Key out a flat colour with FFmpeg colorkey and composite it over a background
Coverage
For editors with a green-screen or other flat-colour backdrop who want a command-line key. You end with the backdrop made transparent and the clip composited over a background, tuned from the manual's starting values. Based on the FFmpeg manual and not run, so real key quality is unknown.
Example
A hypothetical green-screen interview keyed from the manual's starting values with three trial similarity settings compared on a hair frame; nothing was run.
Useful starting points
- If green remains, sample the key colour again and raise the similarity a little at a time.
- If parts of the subject disappear, the similarity is too high; lower it.
- Jagged edges usually mean the blend is at 0.0; raise it. Colour spill is not covered by the manual, so check by eye.
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