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Straighten a skewed screen or document clip with FFmpeg perspective
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What this guide covers
For editors with footage of a screen, whiteboard or document shot at an angle who want it squared up. You end up with a filter string that maps four corner points to the frame corners. Based on the FFmpeg manual; no command was run.
More about this guide
Guide ID: art_01M6V6MRNEK5Z6ZW4FRYT2RA8G
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Guide title
Straighten a skewed screen or document clip with FFmpeg perspective
Coverage
For editors with footage of a screen, whiteboard or document shot at an angle who want it squared up. You end up with a filter string that maps four corner points to the frame corners. Based on the FFmpeg manual; no command was run.
Example
A hypothetical 1920 by 1080 clip with invented corner coordinates, mapped to the frame corners with the default sense; no run was made.
Useful starting points
- A twisted or flipped picture usually means the corners are in the wrong order: top left, top right, bottom left, bottom right.
- With the default settings the filter leaves the picture unchanged, which makes a handy baseline.
- Fixed corners need the default init evaluation; only moving coordinates need per-frame evaluation.
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