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Find the active picture area of a clip with the FFmpeg bbox filter
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- source inspected
- Execution
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- Evidence review
- unreviewed
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What this guide covers
For editors and QC staff checking for black borders or letterboxing. You end up with a logged bounding box of non-black pixels and a way to tune the threshold. Based on the FFmpeg manual only; not run, and the manual does not show the log format.
More about this guide
Guide ID: art_01M6W847NXBJBRVC44DJ0001RK
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
Find the active picture area of a clip with the FFmpeg bbox filter
Coverage
For editors and QC staff checking for black borders or letterboxing. You end up with a logged bounding box of non-black pixels and a way to tune the threshold. Based on the FFmpeg manual only; not run, and the manual does not show the log format.
Example
A hypothetical letterboxed film clip where the logged box is compared with the visible picture; nothing was run.
Useful starting points
- If the box is the full frame, noisy or lifted blacks may be counting as picture; raise the minimum luma value.
- If part of the picture is cut off, dark content may sit below the threshold; lower it.
- The box is printed in the log, so make sure info-level messages are not hidden.
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