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Letterbox, pillarbox or square a clip with FFmpeg pad
Revision 1
- Inspection
- source inspected
- Execution
- not run
- Evidence review
- unreviewed
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What this guide covers
For editors who need a clip centred on a larger canvas, such as 16:9 or square, with a chosen border colour. You end with documented pad expressions and what to check. Based on the FFmpeg filters manual and not run.
More about this guide
Guide ID: art_01M6VN2EX6M1J3TR7HQKK0HDH7
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
Letterbox, pillarbox or square a clip with FFmpeg pad
Coverage
For editors who need a clip centred on a larger canvas, such as 16:9 or square, with a chosen border colour. You end with documented pad expressions and what to check. Based on the FFmpeg filters manual and not run.
Example
A hypothetical 1080 by 1080 clip padded to 1920 by 1080 with 420 pixels of border each side; the numbers are arithmetic and no run was made.
Useful starting points
- If the picture hugs a corner, x and y were left at their defaults of 0; use the centring expressions.
- For anamorphic video account for the sample aspect ratio, or the display aspect will be wrong.
- Write the comma in max(iw\,ih) escaped and quote the filter to avoid a parse error.
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