A short while ago Chris Koehncke posed the question, “Is 4K video viable for a WebRTC web application?” He also offered a well-reasoned opinion. While there’s technical support for 4K in browsers, and 4K webcams are starting to appear, in various ways bandwidth remains a constraint. As a purely practical matter, and in the most common use case, he’s perfectly correct.
The folks over at the Red5Pro blog offer a mildly dissenting opinion. They note that for use-cases beyond video conferencing, most especially one-way streams, 4K is quite practical. People stream Netflix at 4K. Heck, I’ve done it myself at least once or twice.