In recent times, video has become one of the common ways people consume content online. However, high-resolution videos like HD and 4K require a lot of storage space and internet bandwidth. Although this is a challenge, HEVC addresses it by compressing video files while maintaining good visual quality. Considering this, the article below is a complete guide on High Efficiency Video Coding and everything you need to know.
What is HEVC?
HEVC (High Efficiency Video Coding), also called H.265, is a modern method for reducing video file size and is valuable for HD, 4K, and even 8K video streaming. This way, high-quality videos use less space or data over the internet and yet deliver clear footage. Moreover, it can maintain the same picture quality as the older H.264/AVC standard, but with 25-60% less data.
Simply put, HEVC is a technology that compresses video files, making them smaller and faster to send over the internet. Thus, many online video platforms and devices use this video codec to deliver high-quality video without constant buffering. Still, many older devices might not fully support it, but the majority of hardware and software add built-in HEVC decoding.
How Does HEVC Work?
To fully understand its technical efficiency, you need to look at how HEVC video compresses and organizes video data. So, draw your attention to the following section and understand how this codec manages to compress video:
1. HEVC Compresses Video
It compresses video data to reduce file size while preserving nearly the same visual quality. As a newer codec (video compression standard), HEVC is designed to be more efficient than older standards such as H.264. Additionally, the main motive is to reduce the amount of data required, so videos stream faster.
2. Looking Inside Each Frame (Intraframe)
One way the HEVC codec works is by compressing each frame (each picture in the video) independently. It analyzes the color and details in a single frame and removes subtle changes that the human eye cannot notice. Hence, this in-frame compression makes each frame lighter in size while still delivering clear playback.
3. Reusing Parts Between Frames (Interframe)
Another way is to compare one frame with the frames before and after it. If large parts of the picture stay the same, like the background, HEVC reuses that data instead of sending it again. Thus, only the parts that move, such as a person’s hands, need new data, which saves a lot of bits.
4. Splitting The Picture into Small Blocks
The HEVC video format divides each frame into many small blocks and analyzes each block separately. For each block, HEVC determines whether it is mostly still or moving and selects the most appropriate compression method. Moreover, this block-based approach makes HEVC flexible and enables it to compress complex scenes more effectively.
5. Balancing Quality and File Size
The HEVC format always tries to balance video quality and how small the file is. If you set a stronger compression level, the file becomes smaller, but you may see more artifacts, like blurring. However, if you choose lighter compression, the video looks better but uses more storage and internet data. Correct settings, like bitrate, resolution, and frame rate, allow streaming platforms to strike the right balance for their needs.
6. Result: Smaller Files and Less Bandwidth
Considering the above techniques, HEVC can deliver similar or better quality than H.264, using much less data. This means a 4K video encoded with HEVC can be streamed smoothly, where an older codec might buffer. Additionally, it lets companies store many more hours of video on the same amount of disk space, which saves cost.
Key Features of HEVC
The innovations in this encoding standard make it possible to deliver sharper videos and better streaming in a smaller size. With such basics in mind, let’s review key features of the technology that make it the preferred choice among all:
- Higher Compression Efficiency: As discussed, HEVC can make video files much smaller than older codecs like H.264 while keeping similar visual quality. For example, a video that needed a certain bitrate with H.264 may need around half that bitrate with the compression method.
- Support for HD, 4K, and 8K: This video format is made to handle modern high-resolution video, including full HD and even 8K. Moreover, it manages a large number of details more efficiently, so high-resolution streams look sharp without extremely high bitrates.
- Flexible Block Structure: HEVC breaks each frame into small blocks and can adjust block size based on the footage’s complexity. Therefore, this flexible block structure enables HEVC to compress both simple and complex scenes effectively.
- Better Motion Handling: It includes advanced tools to track and predict motion between the frames. Furthermore, it can accurately track how objects move, which lets it reuse data from previous frames and send changes only.
- Improved Image Quality at Low Bitrates: Just because HEVC codecs are more efficient, they can keep videos looking cleaner and less blocky at low bitrates. It’s helpful when streaming over slow or unstable internet connections, where the bandwidth is limited.
- Bandwidth and Storage Savings: While reducing the amount of data needed for each video, this codec helps save bandwidth for streaming services and viewers. Additionally, it lowers storage costs for creators and platforms that host many hours of video.
Advantages and Disadvantages of HEVC
Although the HEVC video format offers impressive benefits, it also comes with certain limitations that every user should consider. Simply, read the listed advantages and disadvantages of HEVC to see where it excels and where it faces challenges:
Advantages of HEVC
- HEVC works well on slow or unstable internet connections because smaller files need less bandwidth.
- It helps mobile users by reducing data usage and still giving a clear video.
- Platforms and companies can store more content without needing huge amounts of disk space.
- HEVC supports modern features like HDR and richer color spaces, so videos look more vibrant.
- This video format delivers better compression, displaying better quality with up to half the file size.
Disadvantages of HEVC
- This format is complex, so it requires more processing power to encode and, sometimes, to playback.
- Not all devices, software, and web browsers fully support HEVC; thus, users face playback problems.
- It requires commercial licensing; companies must pay usage fees, which increases the cost of service.
- HEVC encoding (compressing) usually takes longer than older codecs, slowing the overall workflow for many.
- Some browsers and platforms have limited support for HEVC live streaming, making it harder to use in many livestreaming situations.
Common Use Cases of HEVC
The following use cases highlight how the technology is being used to deliver high-quality video across different platforms:
1. Livestreaming (Sports, Events, Social)
The HEVC video codec is widely used for live streams such as sports, gaming, and social media events. Its compression lets platforms send high-quality video with fewer glitches and lower latency, even in low-bandwidth situations. Moreover, it helps streamers deliver clearer, smoother live videos without needing a very high upload speed.
2. 4K And Ultra‑HD Streaming
Among all, HEVC is a top choice for 4K and even 8K video because it can handle very detailed images. Real-World tests from major streamers report that for HD and 4K, the video codec often saves about 24-40% bandwidth. Additionally, Data Intelo research notes that HEVC is closely linked to UHD/4K growth, with leading platforms relying on it.
3. Mobile Streaming on Phones and Tablets
This format is popular for mobile streaming because it reduces data usage and storage needs. Also, smaller file sizes mean videos load faster and use less mobile data, which is valuable with limited data plans. According to Scientia Mobile research, HEVC decode is now available on over 95% of smartphones shipped today.
4. Video Calling and Online Meetings
It’s widely used in video calling and conferencing tools to keep video calls clear when the internet quality is poor. Moreover, HEVC maintains video quality at low bitrates, which is convenient for users joining mobile networks. Subsequently, it supports high-definition calls in the office for professional meetings, making them very sharp.
5. High‑Resolution Content Libraries (VOD Platforms)
Streaming services and video platforms use HEVC to store large libraries of HD and 4K content. As the video codec can cut file sizes by about half compared to AVC, platforms can host more movies on the same storage. Thus, Verified Market Report states that the global HEVC market is expected to grow strongly through the 2020s.
HEVC vs AVC: Is HEVC better than H.264(AVC)?
Remember, knowing what HEVC is helps highlight why it was developed and how it improves older video compression methods, H.264 (AVC). Still, a brief comparison of HEVC vs H.264 is provided, which clarifies their differences, strengths, and performance:
| Key Considerations | HEVC (H.265) | AVC (H.264) |
|---|---|---|
| Compression | About 30–50% smaller files at similar quality. | Requires a higher bitrate for similar quality. |
| Required Bandwidth | Uses less bandwidth, suitable for high-resolution streaming. | Needs more bandwidth for the same quality. |
| Video Quality | Better quality at the same bitrate, especially for 4K. | Good quality, but less efficient than HEVC. |
| Device Support | Supported on most modern devices, but not everywhere. | Very widely supported across devices and platforms. |
| Processing Power | More complex, it requires a stronger CPU/GPU. | Easier to process on older devices. |
| Encoding Speed | Slower encoding due to advanced compression. | Faster encoding in most cases. |
| Licensing and Cost | Simpler licensing is often cheaper. | Simpler licensing, often cheaper. |
| Best Use Case | 4K/8K streaming and bandwidth-limited networks. | General streaming and standard HD delivery. |
Note: Indeed, HEVC is generally better than H.264 (AVC) for compression efficiency, often saving 20-50% bitrate for similar visual quality. Even the Verified Market Report shows that the HEVC global market is projected to reach 25.6 billion USD by 2033. This clearly demonstrates that, beyond HEVC’s efficiency, its use will continue to increase in the coming years.
You may also like: H264 vs H265: Which is Better?
How ZEGOCLOUD Supports Efficient Video Streaming
While HEVC significantly improves video compression efficiency, delivering high-quality video streaming also requires a reliable real-time communication infrastructure. This is where platforms like ZEGOCLOUD play an important role.
ZEGOCLOUD provides real-time audio and video SDKs that help developers build interactive applications such as live streaming platforms, video conferencing systems, social apps, and online classrooms. These solutions are designed to maintain smooth video delivery even in unstable network environments.
With global infrastructure and advanced media processing technologies, ZEGOCLOUD enables developers to:
- Deliver stable real-time video streaming experiences
- Optimize bandwidth usage for HD and 4K video delivery
- Support large-scale interactive streaming scenarios
- Build low-latency communication features for apps and platforms
By combining efficient codecs such as HEVC with real-time communication platforms like ZEGOCLOUD, developers can deliver high-quality video experiences while maintaining low latency and efficient bandwidth usage.
Conclusion
In summary, the HEVC codec has significantly improved modern video streaming by enabling high-quality playback with reduced bandwidth usage. Although it may require more advanced devices for smooth decoding, its benefits still outweigh the drawbacks. Therefore, it remains a practical choice for delivering premium-quality visuals across platforms, and solutions like ZEGOCLOUD also leverage efficient video technologies to support reliable streaming experiences.
FAQ
Q1: What is High Efficiency Video Coding (HEVC)?
High Efficiency Video Coding (HEVC), also known as H.265, is a modern video compression standard designed to reduce video file sizes while maintaining high visual quality. It allows HD, 4K, and even 8K videos to be streamed or stored using significantly less bandwidth and storage compared to older codecs like H.264.
Q2: Is HEVC better than H.264 (AVC)?
Yes, HEVC generally provides better compression efficiency than H.264. In many cases, it can reduce the required bitrate by about 30–50% while delivering similar or even better video quality. This makes HEVC especially useful for high-resolution streaming such as 4K and 8K video.
Q3: Does HEVC support 4K and 8K video?
Yes. One of the main reasons HEVC was developed is to support high-resolution formats like 4K and 8K. Its improved compression efficiency allows platforms to deliver ultra-high-definition content without requiring extremely high bandwidth.
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