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What is 720x480?

720x480 is a standard-definition digital video frame size used by NTSC-based DVD and DV formats. Such content often relies on non-square pixels to produce its intended display aspect ratio.

How 720x480 works

A 720×480 frame has a stored raster ratio of 3:2, yet many standard-definition systems present it as either 4:3 or 16:9. That difference is resolved through pixel- or sample-aspect-ratio signaling rather than by changing the stored sample count. During migration to square-pixel web formats, software must combine raster dimensions, display metadata, aperture information, and scan structure before selecting the output geometry.

Key facts

  1. The 720×480 dimensions alone do not reveal whether footage is progressive or interlaced; field order and scan flags must be inspected separately.
  2. A missing or incorrect sample-aspect-ratio flag can make circles appear oval and people appear too narrow or wide even though no pixels are corrupted.
  3. Conversion to square pixels should use the intended display aspect and active image area, not merely resize the 3:2 storage raster to the nearest widescreen frame.

When 720x480 matters

Read the pixel aspect ratio before converting 720x480 footage for square-pixel web playback. Ignoring that metadata can make people and objects appear unnaturally narrow or wide.

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