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Pick frames by number, time or scene change with FFmpeg select
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What this guide covers
For editors who need keyframes, every Nth frame, a time window or scene-change frames, for contact sheets or inspection. It follows the FFmpeg manual's select examples, including a scene mosaic. Documentary only; no command was run and output timing is not covered.
More about this guide
Guide ID: art_01M6V56J9G2FF9RKB01AZNVYS8
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Guide title
Pick frames by number, time or scene change with FFmpeg select
Coverage
For editors who need keyframes, every Nth frame, a time window or scene-change frames, for contact sheets or inspection. It follows the FFmpeg manual's select examples, including a scene mosaic. Documentary only; no command was run and output timing is not covered.
Example
A hypothetical 60-second clip at 30 frames per second, where keeping one frame in 100 gives 18 frames by arithmetic; no run was made.
Useful starting points
- If the expression never matches, no frames come out; a test with the always-keep value shows whether the rest of the command works.
- Commas inside the expression must be escaped and the expression quoted, or it fails to parse.
- If a scene mosaic has repeated or missing shots, adjust the scene threshold within the manual's suggested range first.
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