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Find black intervals in a video with FFmpeg blackdetect
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What this guide covers
For editors and archivists who want a list of black stretches, such as chapter breaks, ad gaps or dropouts, without watching a whole file. You end up with start, end and duration times from FFmpeg's log. Based on the FFmpeg manual and not run.
More about this guide
Guide ID: art_01M6W1A395C925BSWFJ027SGNF
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 black intervals in a video with FFmpeg blackdetect
Coverage
For editors and archivists who want a list of black stretches, such as chapter breaks, ad gaps or dropouts, without watching a whole file. You end up with start, end and duration times from FFmpeg's log. Based on the FFmpeg manual and not run.
Example
A hypothetical recording with ad breaks separated by black: the manual's filter string is run and the logged start and end times noted; nothing was run, so no times were seen.
Useful starting points
- If nothing is reported, the minimum duration may be longer than the real gaps or the thresholds too strict.
- If dark scenes are reported as black, make the pixel threshold lower or the picture ratio higher.
- The interval lines print at info log level, so a very quiet log level hides them.
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