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Fix aspect-ratio labelling with FFmpeg setsar and setdar
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What this guide covers
For editors whose clip plays at the wrong proportions. You end with the display or pixel aspect ratio labelled correctly without resizing the frame, and a way to tell when a later filter undoes it. It is based on the FFmpeg manual and no command was run.
More about this guide
Guide ID: art_01M6VKD1659P249405EW6RGC7X
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
Fix aspect-ratio labelling with FFmpeg setsar and setdar
Coverage
For editors whose clip plays at the wrong proportions. You end with the display or pixel aspect ratio labelled correctly without resizing the frame, and a way to tell when a later filter undoes it. It is based on the FFmpeg manual and no command was run.
Example
Hypothetical arithmetic only: a 720 by 576 clip with square pixels labelled 16:9 needs a sample aspect ratio of about 1.42, with the frame size unchanged.
Useful starting points
- If the ratio reverts, a later scale or aspect filter changed it; put the setting last.
- A slightly wrong ratio can come from rounding to a small fraction; raise the max limit.
- Probe the output rather than trusting how one player shows it.
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