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What is Video Scaling?

Video scaling changes frame dimensions through resampling. The process must preserve or deliberately alter aspect ratio while balancing aliasing, softness, processing time, and output size.

How Video Scaling works

A scaler reconstructs a continuous approximation from source samples and evaluates it on a new pixel grid. Downscaling should remove frequencies the smaller grid cannot represent, while upscaling estimates new samples without creating real source detail. The filter, chroma handling, edge policy, and geometry mode are chosen when producing derivatives, normalizing mixed footage, or placing media inside a composition.

Key facts

  1. Downscaling without an appropriate low-pass filter can fold fine texture into false patterns called aliasing; stronger filtering reduces that risk but may soften legitimate edges.
  2. Chroma-subsampled video stores color on a coarser grid than luma, so a scaler must respect chroma siting or it can shift color edges relative to brightness detail.
  3. Letterboxing and pillarboxing preserve the complete frame, cropping preserves shape while discarding edges, and stretching changes geometry; these are distinct fit policies.

When Video Scaling matters

Scaling creates smaller streaming variants or fits footage within a target canvas. Incorrect aspect-ratio handling causes stretching, while weak resampling filters can introduce jagged edges or blur.

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