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Remove passers-by from locked-off takes with FFmpeg xmedian
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What this guide covers
For editors with several aligned takes of a locked-off shot who want a clean plate. You end with a per-pixel median composite of three or more inputs. Based on the FFmpeg manual only; no command was run, and the alignment advice is general practice.
More about this guide
Guide ID: art_01M6W77V5VYEW92SFVQMSKKS35
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Guide title
Remove passers-by from locked-off takes with FFmpeg xmedian
Coverage
For editors with several aligned takes of a locked-off shot who want a clean plate. You end with a per-pixel median composite of three or more inputs. Based on the FFmpeg manual only; no command was run, and the alignment advice is general practice.
Example
Hypothetical case: three takes from a fixed camera, one with a passer-by. The passer-by should vanish because of the median; this was reasoned, not observed.
Useful starting points
- xmedian needs at least three inputs; with an even count it averages the two middle values.
- Ghosting usually means the inputs were not aligned; align them first.
- Percentile 0 picks per-pixel minimum values and 1 picks maximum values; the default 0.5 picks the median.
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