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Reduce noise in a clip with the FFmpeg hqdn3d denoiser
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What this guide covers
Helps editors and compressionists with a grainy clip who want less noise without a waxy look. You end up understanding how the spatial and temporal strengths relate and how to tune them. It is based on the FFmpeg manual, was not run, and its visual and file-size effects are untested.
More about this guide
Guide ID: art_01M6V2VF2VEE8K8K3VFTBMZT0Z
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Guide title
Reduce noise in a clip with the FFmpeg hqdn3d denoiser
Coverage
Helps editors and compressionists with a grainy clip who want less noise without a waxy look. You end up understanding how the spatial and temporal strengths relate and how to tune them. It is based on the FFmpeg manual, was not run, and its visual and file-size effects are untested.
Example
A hypothetical grainy phone clip: the guide works out the default temporal strength from the manual's formula and shows how it changes with a lower spatial strength; nothing was run.
Useful starting points
- A waxy, over-smooth look means the strengths are too high; compare flat areas for noise and fine textures for smearing.
- Ghost trails behind moving objects point to a temporal strength that is too high.
- Compare file sizes at identical encoder settings to see whether the denoise helped; the manual only says it should.
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