What Is H.265 in CCTV? : H.265 vs H.264, Storage, Bandwidth & 4K

H.265, also called HEVC (High Efficiency Video Coding), is a video compression standard used by many modern CCTV cameras and NVRs. Its main advantage is that it can deliver similar video quality using less data than older H.264 compression in many situations.

For CCTV systems, this can mean lower storage requirements, lower network bandwidth usage and easier management of high-resolution video. The actual savings depend on the camera, scene, bitrate, frame rate, resolution and NVR settings.

If you are building a new surveillance system, H.265 becomes particularly useful with 4K CCTV cameras and systems that record continuously.

H.265 in CCTV: Quick Answer

Question	Quick Answer
What is H.265?	H.265, or HEVC, is a video-compression standard used to reduce CCTV video data.
Is H.265 better than H.264?	Generally yes for compression efficiency, although actual results depend on bitrate, scene and settings.
Does H.265 save storage?	Yes. It can reduce storage requirements compared with H.264 at comparable video quality.
Does H.265 reduce bandwidth?	Yes, when it achieves the required video quality at a lower bitrate.
Is H.265 good for 4K CCTV?	Yes. Efficient compression is particularly useful for high-resolution 4K/8MP video.
Does H.265 improve camera resolution?	No. H.265 compresses video; it does not increase the camera’s resolution.
Does the NVR need H.265 support?	Yes, the NVR should support the camera’s H.265 stream and relevant resolution and bitrate specifications.
Should I choose H.265 for a new CCTV system?	Generally yes, especially for high-resolution cameras and continuous recording, provided all equipment is compatible.

What Is H.265 in CCTV?

H.265 is a video compression technology designed to reduce the amount of data required to encode video while maintaining good image quality.

A CCTV camera produces a continuous stream of video data. Without compression, storing and transmitting that video would require a very large amount of storage and network bandwidth.

Compression reduces this data.

H.265 uses more advanced compression techniques than H.264, allowing many CCTV systems to store or transmit video more efficiently.

What Does HEVC Mean?

HEVC stands for High Efficiency Video Coding.

H.265 is commonly used to refer to the HEVC video compression standard.

You may therefore see specifications such as:

• H.265
• HEVC
• H.265/HEVC

In CCTV product specifications, these terms generally refer to the same underlying video-compression standard.

Why Is H.265 Used in CCTV?

Modern CCTV cameras can have high resolutions such as 4MP, 5MP and 8MP/4K. Higher resolution produces more video data.

H.265 helps reduce the amount of data that needs to be stored or transmitted.

This is useful for:

• 4K CCTV cameras
• High-resolution IP cameras
• 24-hour recording
• Large multi-camera systems
• Remote viewing
• Limited network bandwidth
• Longer recording retention

For a broader explanation of resolution selection, see what CCTV camera resolution you need.

H.265 vs H.264 for CCTV

Feature	H.264	H.265
Compression efficiency	Good	Generally better
Data required for similar quality	Generally higher	Generally lower
Storage efficiency	Good	Better
Bandwidth efficiency	Good	Better
4K suitability	Possible	Very useful
Hardware requirements	Generally lower	Generally higher
Compatibility	Very widespread	Widely supported by modern equipment

H.265 is generally more efficient, but this does not mean that every H.265 recording will automatically use half the storage of H.264. Actual compression efficiency varies significantly with the scene and encoding settings.

Does H.265 Save CCTV Storage?

Yes, H.265 can reduce CCTV storage requirements compared with H.264 when comparable image quality and suitable encoding settings are used.

The amount of storage saved depends on factors such as:

• Camera resolution
• Frame rate
• Bitrate
• Scene complexity
• Amount of movement
• Day versus night conditions
• Compression settings
• Constant versus variable bitrate

A busy road with constant movement may require substantially more data than a quiet indoor room, even when both cameras have the same resolution.

Simple Example of H.265 Storage Savings

Suppose a camera produces an average recording bitrate of 4 Mbps using one configuration.

Reducing the required bitrate to 3 Mbps while maintaining acceptable image quality would reduce the amount of data stored by approximately 25%.

The important point is that storage depends directly on bitrate and recording time. The codec helps determine how efficiently the video can be compressed, but the final bitrate remains critical.

For a more detailed explanation, see how much storage CCTV needs and our CCTV storage calculator guide.

Usable CCTV Storage Formula

For CCTV planning, you can estimate the storage required from the camera bitrate, number of cameras and recording time.

Approximate storage per camera per day:

Storage (GB/day) ≈ Bitrate (Mbps) × 10.8

For multiple cameras:

Total storage (GB) ≈ Bitrate (Mbps) × 10.8 × Number of cameras × Recording days

To convert the result to terabytes:

Total storage (TB) ≈ Bitrate (Mbps) × 10.8 × Number of cameras × Recording days ÷ 1,000

Example: 4 Mbps CCTV Camera

Suppose you have one H.265 camera recording continuously at an average bitrate of 4 Mbps:

4 × 10.8 = 43.2 GB/day

For 30 days:

43.2 × 30 = 1,296 GB ≈ 1.30 TB

Example: 8 Cameras at 4 Mbps

For eight cameras recording continuously at 4 Mbps for 30 days:

4 × 10.8 × 8 × 30 = 10,368 GB ≈ 10.37 TB

Number of Cameras	Average Bitrate per Camera	Approx. Storage/Day	Approx. Storage/30 Days
1	2 Mbps	21.6 GB	0.65 TB
1	4 Mbps	43.2 GB	1.30 TB
1	6 Mbps	64.8 GB	1.94 TB
1	8 Mbps	86.4 GB	2.59 TB
4	4 Mbps	172.8 GB	5.18 TB
8	4 Mbps	345.6 GB	10.37 TB

Important: This formula assumes continuous recording at a constant average bitrate. Actual storage can differ because of variable bitrate, motion recording, camera settings, recording schedules, audio, filesystem overhead and the difference between advertised and usable disk capacity.

How Much Storage Does H.265 CCTV Need?

The formula above provides a practical starting point for estimating storage requirements.

Remember:

Higher bitrate × more cameras × more recording hours = more storage.

If motion recording is used instead of continuous recording, actual storage requirements can be substantially lower depending on how much motion occurs.

For detailed retention planning, see how long CCTV recording lasts.

Does H.265 Improve CCTV Image Quality?

H.265 does not automatically increase the camera’s resolution or image quality.

Its primary purpose is more efficient compression.

A well-configured H.265 camera can preserve useful image detail while reducing data requirements, but image quality still depends on many other factors.

These include:

• Image sensor
• Lens quality
• Resolution
• Bitrate
• Frame rate
• Lighting
• WDR
• Noise levels
• Camera image processing

A poor camera using H.265 can still produce poor video.

H.265 and CCTV Bitrate

Bitrate is one of the most important settings when evaluating CCTV recording quality and storage.

It represents the amount of data used to encode video over time.

Increasing bitrate can preserve more detail, particularly in difficult or highly active scenes, but it also increases storage and bandwidth requirements.

H.265 can allow a camera to achieve a useful level of image quality at a lower bitrate than H.264 in many circumstances.

However, the correct bitrate depends on the particular camera, resolution, frame rate and scene.

H.265 for 4K CCTV Cameras

H.265 is particularly useful for high-resolution surveillance because 4K video produces substantially more data than lower-resolution video.

An 8MP/4K camera provides significantly more pixels than a typical 2MP camera.

Without efficient compression, storing several 4K cameras continuously can require substantial storage capacity.

This is one reason modern 4K cameras and NVRs commonly offer H.265 support.

However, choosing H.265 should not be a substitute for selecting an appropriate camera resolution, lens and bitrate. See the best 8MP/4K CCTV cameras in India for the broader buying considerations.

Does H.265 Reduce CCTV Bandwidth?

It can.

When comparable video quality can be achieved at a lower bitrate, H.265 can reduce the bandwidth required to transmit the video stream.

This can be useful for:

• Large IP CCTV networks
• PoE camera installations
• Remote monitoring
• Wireless network links
• Multi-camera systems

For example, a system with ten cameras can generate considerably less aggregate traffic if each camera is configured efficiently.

However, network planning should still account for the actual configured bitrate of every camera, plus additional network traffic and overhead.

H.265 and PoE CCTV

H.265 does not replace PoE.

PoE determines how power and network connectivity are delivered to an IP camera, while H.265 determines how the camera’s video is compressed.

A PoE camera can therefore use H.265 video compression while receiving power and network connectivity through Ethernet.

Learn more in what PoE means in CCTV.

Does the NVR Need to Support H.265?

Yes, if you want the NVR to directly decode and handle the camera’s H.265 stream as intended.

When purchasing an IP camera and NVR separately, check that the NVR supports the camera’s codec and relevant stream specifications.

Do not assume that an older NVR will automatically support every modern H.265 camera.

Also check:

• Maximum supported camera resolution
• Maximum incoming bitrate
• Number of supported cameras
• Supported compression formats
• Main-stream and sub-stream specifications
• Decoding capacity

This is particularly important when combining high-resolution cameras with an NVR from another manufacturer.

If you are using equipment from different manufacturers, our ONVIF CCTV guide explains why interoperability needs to be checked beyond the ONVIF label.

Can an H.264 NVR Record an H.265 Camera?

It depends on the NVR and camera configuration.

If the NVR cannot decode or otherwise support the H.265 stream, you may experience problems with live viewing, recording or playback.

Some cameras provide multiple streams or allow the compression format to be changed. In such a case, an H.264 stream may provide a compatibility option.

Always check the specific NVR’s supported codecs before purchasing.

H.265 vs H.265+

Some CCTV manufacturers offer technologies marketed under names such as H.265+ or other smart-compression names.

These are generally manufacturer-specific enhancements designed to reduce bitrate or storage requirements further under suitable conditions.

They should not automatically be treated as identical to the base H.265 standard.

If you use a camera and NVR from different manufacturers, check whether the NVR supports the camera’s particular smart-compression technology.

What Is H.265+ in CCTV?

H.265+ is a term used by some manufacturers for additional compression techniques built around H.265-based encoding.

The objective is typically to reduce the bitrate required for surveillance video while maintaining acceptable image quality.

The actual implementation can vary between manufacturers.

Therefore, when buying mixed-brand equipment, it is safer to verify compatibility with the standard H.265 stream rather than assuming a proprietary “H.265+” feature will work across all equipment.

H.265 vs H.264 for Continuous Recording

For a camera recording 24 hours a day, compression efficiency becomes particularly important because the camera produces video continuously.

H.265 can be advantageous because even a modest reduction in average bitrate becomes significant over weeks or months.

For example, reducing the average bitrate by 1 Mbps across a continuously recording camera can save a substantial amount of storage over a 30-day retention period.

For retention planning, also see how long CCTV recording lasts.

H.265 and Motion Recording

H.265 can be used with motion-triggered recording as well as continuous recording.

With motion recording, two factors affect storage:

1. The bitrate used while recording
2. The amount of time the camera actually records

A camera that records only when activity occurs can therefore use much less storage than a camera recording continuously at the same bitrate.

However, motion recording must be configured carefully to avoid missing important events.

Does H.265 Use More Processing Power?

H.265 encoding and decoding can require more processing resources than H.264 because the compression process is more computationally complex.

This can matter when selecting:

• Cameras
• NVRs
• Surveillance computers
• NAS systems
• Video-monitoring software

An older device may have limited hardware support for H.265, while modern surveillance hardware may include dedicated decoding capabilities.

Does H.265 Work With Mobile CCTV Viewing?

It depends on the camera, NVR, app and mobile device.

Modern smartphones generally have broad support for common video formats, but surveillance applications may handle the camera stream differently.

Many systems use a lower-resolution sub-stream for remote viewing to reduce mobile bandwidth and processing requirements.

Therefore, if remote viewing is important, check both the main-stream and sub-stream capabilities of the camera and NVR.

H.265 and Sub-Streams

Many IP cameras provide more than one video stream.

The main stream is generally used for higher-quality recording, while a sub-stream may be used for remote viewing or lower-bandwidth applications.

This can allow a system to record high-resolution H.265 video locally while sending a lower-bandwidth stream to a smartphone.

The exact configuration depends on the camera and NVR.

Does H.265 Reduce Internet Data Usage?

It can reduce the amount of data transmitted when the H.265 stream uses a lower bitrate than an equivalent H.264 stream.

However, internet data usage is determined by how much video is actually transmitted.

If your CCTV system streams continuously at a high bitrate, internet usage can still be substantial even with H.265.

Using a lower-resolution sub-stream for remote monitoring can help reduce data usage.

Should You Choose H.265 for a New CCTV System?

In most new IP CCTV installations, H.265 support is a useful feature to have.

It becomes particularly valuable when you are installing:

• 4MP or higher cameras
• 5MP cameras
• 8MP/4K cameras
• Several cameras
• 24/7 recording
• Long retention periods
• Bandwidth-sensitive networks

But do not select equipment based on H.265 alone.

A camera with a better sensor, lens and low-light performance may produce more useful evidence than a higher-resolution camera with poor image quality, even if both use H.265.

What Should You Check Before Buying an H.265 CCTV Camera?

Specification	Why It Matters
Resolution	Determines the amount of image detail
H.265 support	Provides efficient compression
H.264 support	Useful for compatibility
Maximum bitrate	Affects image quality and storage
Frame rate	Affects motion smoothness and data requirements
Main/sub-streams	Useful for recording and remote viewing
Low-light performance	Important for nighttime evidence
WDR	Helps in difficult lighting conditions
NVR compatibility	Ensures recording and playback work correctly

Common H.265 CCTV Mistakes

Choosing H.265 Without Checking the NVR

Always verify that the recorder supports the camera’s codec and stream specifications.

Assuming H.265 Automatically Means Better Video

H.265 is primarily a compression technology. It does not determine the sensor, lens or overall camera quality.

Ignoring Bitrate

Two H.265 cameras can produce very different results if they use different bitrates and image-processing settings.

Buying 4K Without Considering Storage

Higher resolution can provide more detail but also increases storage and processing requirements. Compression helps, but it does not eliminate the additional data generated by high-resolution video.

H.265 CCTV: Pros and Cons

Pros	Cons
Better compression efficiency than H.264 in many situations	Can require more processing resources
Can reduce storage requirements	Older equipment may not support it
Can reduce network bandwidth requirements	Compatibility must be checked
Useful for high-resolution cameras	Actual savings vary by scene and settings
Useful for long-term recording	Does not automatically improve camera image quality

H.265 vs H.264: Which Is Better for CCTV?

For a new CCTV system, H.265 is generally the more efficient choice when the camera, NVR and viewing equipment support it properly.

H.264 remains useful because of its widespread compatibility, particularly when working with older recorders or devices.

If you are building a modern high-resolution system, H.265 can provide an advantage in storage and bandwidth efficiency.

Final Verdict

H.265 is a modern CCTV video-compression standard that can reduce the amount of data required to store and transmit surveillance footage compared with H.264 under comparable conditions.

Its biggest advantages are storage and bandwidth efficiency, making it particularly useful for 4MP, 5MP and 8MP/4K cameras and systems that record continuously.

However, H.265 is only one part of CCTV system design. Before buying, check the camera’s resolution, sensor, lens, bitrate, frame rate, low-light performance and NVR compatibility.

If you are building a new IP CCTV system, H.265 support is generally worth having—but choose the camera and NVR as a complete system rather than choosing the codec alone.

Related Articles

• What CCTV Resolution Do I Need?
• How Much Storage Does CCTV Need?
• CCTV Storage Calculator Guide
• What Is ONVIF in CCTV?
• What Is PoE in CCTV?