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Collaboration, Voice & AV · Intermediate

H.265 (HEVC)

High Efficiency Video Coding, the successor to H.264 that delivers similar quality at roughly half the bit rate.

Definition

H.265 uses larger and more flexible coding tree units, improved motion prediction and better entropy coding to reduce bit rate by about 40 to 50 percent versus H.264 at the same quality. It supports resolutions up to 8K and is common in 4K streaming, surveillance and some AV-over-IP and conferencing products. Licensing complexity and higher encode cost have slowed its adoption in conferencing.

Example

A 4K camera feed encoded in H.265 at 12 Mbps matches the quality of a 25 Mbps H.264 stream.

Exam tip

Higher compression efficiency costs more processing; H.265 is not universally supported by conferencing endpoints.

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