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Clamp video levels to a legal range with the FFmpeg limiter filter
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What this guide covers
For editors preparing TV-range video for delivery who need highlights and shadows kept within signal limits. You end with a clamped clip checked on a levels scope. Based on the FFmpeg manual; no command was run and the manual gives no numeric legal levels.
More about this guide
Guide ID: art_01M6VSJ7EBNMEFW426PXCQYP08
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Guide title
Clamp video levels to a legal range with the FFmpeg limiter filter
Coverage
For editors preparing TV-range video for delivery who need highlights and shadows kept within signal limits. You end with a clamped clip checked on a levels scope. Based on the FFmpeg manual; no command was run and the manual gives no numeric legal levels.
Example
A hypothetical clip with highlights above legal white is limited and its maximum luma compared before and after; nothing was run.
Useful starting points
- The auto bounds only affect TV-range YUV; on a full-range source they have no effect.
- With default options almost nothing is clamped, so set explicit or auto bounds.
- Flat-looking highlights are the cost of clamping; soften highlights before limiting.
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