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Reduce dot crawl and rainbows with FFmpeg dedot
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What this guide covers
For restorers of old composite or analogue footage with crawling dots on edges or rainbow colour patterns. You end with a mode choice and four tuning controls to try one at a time. Based on the FFmpeg manual and not run; the manual gives no defaults or ranges.
More about this guide
Guide ID: art_01M6W57M50RWZKZVP757T1D0Q8
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Guide title
Reduce dot crawl and rainbows with FFmpeg dedot
Coverage
For restorers of old composite or analogue footage with crawling dots on edges or rainbow colour patterns. You end with a mode choice and four tuning controls to try one at a time. Based on the FFmpeg manual and not run; the manual gives no defaults or ranges.
Example
A hypothetical captured VHS clip with crawling dots on a striped shirt: treat dot crawl first, then rainbows if colour patterns remain. Nothing was run.
Useful starting points
- Compare a static detailed area and a coloured edge before and after to spot softening or colour loss.
- If the image softens or colours smear, step the values back.
- Keep the original and write each trial to a new file.
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