H.264 and H.265 are video compression codecs that reduce the file size of surveillance footage by encoding only the differences between frames rather than every frame in full. H.265 (also called HEVC) is the successor standard, delivering approximately 40–50% better compression efficiency than H.264 at equivalent visual quality. For security camera deployments, this difference directly translates to lower bandwidth consumption, reduced storage costs, and the ability to run higher-resolution cameras on existing network infrastructure.
Both H.264 (AVC — Advanced Video Coding) and H.265 (HEVC — High Efficiency Video Coding) are international standards for compressing video. They work by analysing consecutive video frames, identifying the pixels that have changed between frames, and encoding only the differences. This approach reduces file size by 95% or more compared to uncompressed video.
H.264 was ratified in 2003 and has been the dominant compression standard for IP security cameras for over a decade. H.265 was ratified in 2013 and has been widely supported in security cameras manufactured from approximately 2016 onwards. Both standards continue to be actively used in security deployments.
H.265 saves approximately 40–50% bandwidth compared to H.264 at equivalent resolution and visual quality. A concrete example: a 1080p camera streaming at 15 fps typically uses approximately 4 Mbps on H.264, but only approximately 2 Mbps on H.265. For a 32-camera site, that difference saves roughly 64 Mbps of network capacity — enough to avoid a switch or uplink upgrade.
The bandwidth saving translates directly to storage. 90 days of H.265 footage occupies roughly the same storage as 45–50 days of H.264 footage from the same camera at the same settings. For organisations with fixed storage budgets, switching from H.264 to H.265 effectively doubles the available retention period.
H.265 achieves its superior compression by using more complex mathematical operations during encoding and decoding. This means H.265 requires more CPU or GPU resources to process. Older NVRs and some analytics platforms may struggle with H.265 decoding, particularly when handling many simultaneous streams. Always check hardware compatibility before specifying H.265 for a deployment.
H.265 is standard on IP cameras manufactured from approximately 2016 onwards. Legacy cameras and older NVRs may only support H.264. Before specifying H.265 for a project, verify that every device in the pipeline — camera, NVR, VMS, and analytics platform — supports H.265 decoding.
The codec choice has a direct and often underappreciated impact on AI video analytics performance. H.265's bandwidth efficiency enables higher-resolution streams to be delivered to the analytics engine within the same network bandwidth envelope. More pixels means cleaner object detection — the AI has more visual information to work with when classifying objects and making detection decisions.
H.265 effectively enables 4K camera streams on networks that were designed for 1080p H.264 — without requiring network upgrades. For analytics accuracy, the difference can be significant: a 4K stream provides four times the pixel density of 1080p, improving detection of small or distant objects.
However, the analytics platform must support H.265 decoding. If the platform cannot decode H.265 natively, it will either fail to process the stream or require transcoding — which adds latency and processing overhead. Verify analytics platform codec support before deployment.
Use H.265 for new deployments where all hardware — cameras, NVRs, switches, and analytics platforms — supports the codec. The bandwidth and storage savings are substantial and compound across every camera in the deployment.
Use H.264 where legacy hardware requires it. If existing NVRs or analytics platforms do not support H.265 decoding, H.264 remains a reliable and well-supported standard. Upgrading to H.265 in a mixed environment can cause compatibility issues that outweigh the bandwidth savings.
Consider H.264 for low-stakes cameras where bandwidth is not constrained and compute savings matter more than storage. H.264 decoding uses less CPU, which can be relevant for edge devices with limited processing power.
SafetyScope's Omni platform supports both H.264 and H.265 stream ingestion natively. The platform decodes both codecs without transcoding, ensuring minimal latency regardless of the camera's compression setting. For new deployments, SafetyScope recommends H.265 to maximise bandwidth efficiency and enable higher-resolution streams for improved detection accuracy.
Published: 2026-02-11 · Updated: 2026-04-02