Resolutions, aspect ratios, and capture rates
The resolution (also known as frame size or display mode) of a video signal, digital image, TV screen, computer monitor or other display device is a count of the number of pixels displayed horizontally and vertically. For example the resolution 1920×1080 (which is 1080p) creates an image that is 1920 pixels wide and 1080 pixels tall.
The aspect ratio of an image describes the proportional relationship between its pixel width and height. The resolution 1920×1080 (1080p) is quite a bit wider than it is tall. The ratio of its width to height is 16 to 9, represented as an aspect ratio 16:9.
AV.io SDI outputs resolutions in commonly supported aspects ratios. The table below is a color-coded legend for interpreting
| Aspect Ratio | Common Use |
| 4:3 | Standard TV (NTSC/PAL) display and non-widescreen computer displays |
| 16:9 | Widescreen (HD) TV displays (1080p, 1080i, 720p etc.) |
| 1.90:1 | Digital Cinema Initiatives standard resolution for 4K or 2K video projection |
AV.io SDI generates a list of the following possible resolutions for your capture application to select for output display:
| 640×360 | 960×540 | 1920×1080 |
|---|---|---|
| 640×480 | 1280×720 |
Captured video content is output to your application at 15, 30, or 60 frames per second (your application chooses one of these frame rates) when captured over USB 3.0. This table is not an exhaustive list of all the resolutions your AV.io SDI can output, just a list of common and tested resolutions.
