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Grow a strict mask into a looser one with FFmpeg hysteresis
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What this guide covers
For editors building cleaner edge or key masks from two versions of the same mask. You end with a mask that keeps weaker areas only where they connect to stronger ones. Based on the FFmpeg manual; no command was run and the manual gives no example.
More about this guide
Guide ID: art_01M6W4PYG1ZJ0K6S0J2C7E581M
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Guide title
Grow a strict mask into a looser one with FFmpeg hysteresis
Coverage
For editors building cleaner edge or key masks from two versions of the same mask. You end with a mask that keeps weaker areas only where they connect to stronger ones. Based on the FFmpeg manual; no command was run and the manual gives no example.
Example
A hypothetical edge mask made at two thresholds, used to see whether broken lines join; not run.
Useful starting points
- If the output equals the first mask, there may be no connected regions or the threshold may be too high.
- Unprocessed planes are copied from the first input, which can make chroma look odd.
- The filter needs two inputs; giving one causes an input error.
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