H.265 HEVC

H.265, also known as HEVC (High Efficiency Video Coding), is the successor to H.264. It delivers approximately the same video quality at roughly half the bandwidth — a major advantage for IP camera deployments with many streams or high resolution (4K and above).

How It Works

H.265 builds on H.264 with several significant technical improvements:

1. Larger block sizes — up to 64×64 pixels instead of H.264's 16×16, better for high resolutions.
2. Improved prediction — more intra-prediction modes, better motion estimation.
3. Advanced transforms — larger transform blocks and better quantization.
4. Parallel processing — tile and wavefront processing enable GPU-accelerated decode.

Result: same perceptual quality at ~50% the bitrate of H.264, or much higher quality at equivalent bandwidth.

Why It Matters

The bandwidth and storage savings are substantial at scale:

• Halved storage — typical 30-day retention takes half the disk.
• Halved bandwidth — double the cameras on the same network.
• 4K feasibility — H.265 makes multi-megapixel cameras practical.

But H.265 has trade-offs:

• Higher compute cost — encode and decode require more CPU/GPU.
• Licensing complexity — patent pool with multiple licensors.
• Older cameras may not support it — mixed fleets are common.

IncoreSoft's VMS platform supports both H.264 and H.265, transcoding as needed for analytics and client playback.

Use Cases

• 4K and multi-megapixel cameras — where H.264 would be excessively large
• Bandwidth-constrained sites — remote, cellular, or satellite connections
• Long retention — regulatory 60- or 90-day archives
• Large camera counts — cutting storage and bandwidth in half at scale
• Modern greenfield deployments — where all cameras support HEVC

Frequently Asked Questions

Does H.265 affect analytics accuracy?

Comparable to H.264 at equivalent bitrate, better at lower bitrates. Both codecs introduce artifacts at aggressive compression; keep bitrates high enough for analytics-critical streams.

Why isn't H.265 universal yet?

Licensing costs and decoder compatibility slowed adoption. Most new cameras and VMS platforms support H.265; browser support is growing but not universal.

What about AV1 and H.266?

Newer codecs offer further compression improvements. Adoption in surveillance is slow because real-time encode costs are high. H.265 is the current sweet spot for most deployments.