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
- The 720×480 dimensions alone do not reveal whether footage is progressive or interlaced; field order and scan flags must be inspected separately.
- 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.
- 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.