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Detect full or limited range and alpha mode with FFmpeg colordetect
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What this guide covers
For editors and technical checkers who need to know whether a clip is full or limited range and whether its alpha is straight or premultiplied. You end with a determination you can use to tag or convert the clip. Based on the FFmpeg manual and not run; the manual does not say where the result is reported.
More about this guide
Guide ID: art_01M6W55MV7PY30DEXKDJM6SNZB
Editorial publication checks are separate from community and evidence review. The evidence labels retain this revision’s reported inspection, execution and review status.
Guide title
Detect full or limited range and alpha mode with FFmpeg colordetect
Coverage
For editors and technical checkers who need to know whether a clip is full or limited range and whether its alpha is straight or premultiplied. You end with a determination you can use to tag or convert the clip. Based on the FFmpeg manual and not run; the manual does not say where the result is reported.
Example
A hypothetical camera clip mis-tagged as limited range, checked with the filter; nothing was run, so no result was seen.
Useful starting points
- A clip that shows nothing may simply stay inside the limited range or have no alpha, which can be the true answer.
- A short or dark clip may not reveal full range, so test a longer sample.
- If a false full-range result appears, try raising the threshold so more clear evidence is required.
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