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Find black frames with FFmpeg blackframe
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What this guide covers
For editors and archivists who want a per-frame list of almost fully black frames with timestamps, for finding chapter breaks, ad breaks or accidental black. You end up with log lines from FFmpeg you can cross-check in a player. Based on the FFmpeg manual and not run.
More about this guide
Guide ID: art_01M6WEAS5XRX7QVN52TTYRQM16
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Guide title
Find black frames with FFmpeg blackframe
Coverage
For editors and archivists who want a per-frame list of almost fully black frames with timestamps, for finding chapter breaks, ad breaks or accidental black. You end up with log lines from FFmpeg you can cross-check in a player. Based on the FFmpeg manual and not run.
Example
A hypothetical recorded broadcast scanned at the default settings, noting the timestamps that bracket ad breaks; nothing was run, so no timestamps were seen.
Useful starting points
- The result lines only appear if the log level is at least info.
- If dark scenes are flagged, lower the pixel threshold; if fades are missed, try a lower amount.
- Cross-check the logged times against the picture in a player before cutting anything.
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