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Key out a colour with FFmpeg hsvkey
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What this guide covers
For editors pulling a rough key from a coloured backdrop with FFmpeg. You end with a clip where a chosen hue, saturation and value range is transparent. It is based on the FFmpeg manual and was not run; the manual gives no example or way to measure the key values, so the tuning advice is the author's suggestion.
More about this guide
Guide ID: art_01M6WF740XRXBP67BN9A2PRSNV
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Guide title
Key out a colour with FFmpeg hsvkey
Coverage
For editors pulling a rough key from a coloured backdrop with FFmpeg. You end with a clip where a chosen hue, saturation and value range is transparent. It is based on the FFmpeg manual and was not run; the manual gives no example or way to measure the key values, so the tuning advice is the author's suggestion.
Example
A hypothetical green-screen interview keyed around hue 120 with similarity widened until the backdrop clears; nothing was run and no matte was seen.
Useful starting points
- Backdrop speckles usually mean similarity is too low; a subject turning transparent means it is too high.
- If the output shows no transparency, the container or codec lacks alpha; use an alpha-capable format.
- Inspect the result over a contrasting background to judge the matte and the edges.
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