Video Resolution

Resolution is the number of pixels arranged by width and height in an image or on a screen. The more pixels there is, the higher image quality is. The most widely-used resolutions are usually called formats and have proper names such as Full HD or Ultra HD.

For the sake of brevity, people sometimes specify only height (referred to as p or i) when speaking about resolution. They imply that width and height have a standard ratio of 16:9.

The difference between p or i lies only in the method of transmitting alternating images, but not in the final resolution. i means that interlaced scanning is used and video quality will be a bit lower in comparison with complete frame transmission.

As video conferencing gains in popularity, more demanding requirements are set for its quality. This trend has led to many improvements such as new opportunities for content sharing, more sophisticated data protection technologies, and, of course, increased resolution of video streams.

By early 2019, Full HD (1080p) became the most popular video conference format; however, 4K conferences also enter the mainstream. 4K images are approximately two times wider and higher than Full HD images.

Format Designation Resolution
HD 720p 1280×720
Full HD 1080p 1920×1080
4K 2160p 3840×2160

The evolution of video formats has a long history. It started with resolutions of several hundred pixels (SQCIF 128х96 and QCIF 176х144).

Today, there are many solutions for 4K conferences, including TrueConf Server. This software also allows one-to-one 4K calls (which is very rare).

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Source: trueconf.com