In short: great for controlled ecosystems (mobile apps, desktop software, game consoles). Less useful for open-web delivery today.
The Ultimate Guide to Companion HEVC: Optimising Your 4K Video Workflow companion hevc
That depends on your audience.
The core "companion" benefit of HEVC is its efficiency. It can provide approximately than its predecessor while maintaining the same level of video quality. This means you can store twice as much video on a hard drive or stream high-definition content with half the data usage. How the Technology Works In short: great for controlled ecosystems (mobile apps,