Differences and selection suggestions between H.264, H.265 and H.265+

Comparison of three generations of standards

Why can H.265+ save another level

H.265+ is not an international standard, but an engineering optimization done by the manufacturer based on H.265, mainly through:

• Scene Adaptive Coding: Static backgrounds use extremely low bit rates, and only moving foregrounds are encoded.
• Long GOP structure: Reduce the number of I-frames (at the cost of slightly slower drag positioning).
• Intelligent Noise Suppression: Noise reduction first and then encoding to avoid encoding noise as details.
• Region of Interest (ROI) encoding: high quality in key areas and low bit rate in edge areas.

Compatibility risk (important)

• H.265+ from different brands are usually incompatible with each other, and may fall back to H.265 or fail to be previewed when mixed.
• Old NVRs may not support H.265 decoding and only support H.264. This needs to be confirmed before purchasing.
• Some browsers and players do not natively support H.265, and remote preview may require special plug-ins or transcoding.
• When connecting to a third-party platform (such as the GB/T 28181 upper-level platform), you need to confirm the encoding format supported by the other party.

Suggestions for selection

1. Newly built and with the same brand of front-end and back-end: H.265+ is preferred, and the storage cost advantage is obvious.
2. Newly created but needs to be connected to a third-party platform: select standard H.265, which is safe.
3. Keep the old NVR in the renovation project: set the front end to H.264, or replace the back end in batches.
4. Intelligent analysis scenarios: Note that high compression rates may lose details and affect recognition accuracy, so actual measurement and parameter adjustment are required.