Difference Between SD and HD Video

In general, Standard Definition Video (SD) is 640 pixels wide while High Definition (HD) is 1280 pixels wide. But there are variations. SD video includes 640 x 480 px (4:3 aspect ratio) and 640 x 360 px (16:9 aspect ratio). Where as HD video starts out at 1280 x 720 px (16:9 aspect ratio) and goes up in pixelation from there depending on the platform where it being received. The current defacto standard for representing HD on television is called 1080p, which is 1920 pixels wide by 1080 pixels high.

Format Resolution Bit rate
Standard Definition (SD)
4:3 aspect ratio
640 x 480 px 2,000 – 5,000 kbit/s
Standard Definition (SD)
16:9 aspect ratio
640 x 360 px 2,000 – 5,000 kbit/s
720p High Definition Video (HD)
16:9 aspect ratio
1280 x 720 px 5,000 – 10,000 kbit/s
1080p High Definition Video (HD)
16:9 aspect ratio
1920 x 1080 px 10,000 – 20,000 kbit/s
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