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Resize video with the FFmpeg zscale filter
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What this guide covers
For editors who want a clip resized with a chosen scaler instead of FFmpeg's default, for example a 4K to HD downscale. You end with a resized clip with the aspect ratio kept. It follows the FFmpeg manual, was not run, and does not cover HDR tone mapping.
More about this guide
Guide ID: art_01M6WAAM0VPS6C446VMFDQN3VR
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Guide title
Resize video with the FFmpeg zscale filter
Coverage
For editors who want a clip resized with a chosen scaler instead of FFmpeg's default, for example a 4K to HD downscale. You end with a resized clip with the aspect ratio kept. It follows the FFmpeg manual, was not run, and does not cover HDR tone mapping.
Example
A hypothetical 4K to HD downscale compares a sharper resize filter against the default; the guide notes nothing was run, so the comparison was not seen.
Useful starting points
- The filter only exists in builds compiled with the zimg library; if FFmpeg reports no such filter, use a build that includes it.
- Setting one dimension to a negative number keeps the aspect ratio and rounds to a multiple of that number.
- If colours change unexpectedly, set the colour properties explicitly instead of relying on automatic conversion.
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