What is H.265 HEVC (High-Efficiency Video Coding)?

What is H.265 HEVC (High-Efficiency Video Coding)?

ITU-T and ISO/IEC jointly developed video compression standard H.265 referred to as HEVC (High-Efficiency Video Coding). HEVC is designed to replace its predecessor H.264/MPEG-4 referred to as AVC (Advanced Video Coding), in almost all applications with specific focus on encoding of UHD video. HEVC supports state-of-the-art and next-generation of display technologies offering higher resolutions, frame rates, and improved picture quality in terms of noise level, color gamut, and dynamic range.

Also for resolution beyond HDTV, HEVC achieves substantially better performance in comparison to AVC and it allows reducing bit-rate by up to 65% while maintaining the same perceived quality. Although many vendors are participating in the standardization process for the H.265 codec, it is expected to take several years after ratification for wide-scale product support.

H.265 has better compression performance and lower bandwidth utilization ratio. Compared with H. 264, the greatest strength of H. 265 is that it has a higher compression ratio, which can be discerned from its name. HEVC was designed to substantially improve coding efficiency compared to H.264/MPEG-4 AVC HP, i.e. to reduce bitrate requirements by half with comparable image quality, at the expense of increased computational complexity.

HEVC was designed with the goal of allowing video content to have a data compression ratio of up to 1000:1.Depending on the application requirements, HEVC encoders can trade off computational complexity, compression rate, robustness to errors, and encoding delay time. Two of the key features, where HEVC was improved compared to H.264/MPEG-4 AVC, were support for higher resolution video and improved parallel processing methods.

 Average bit rate reduction by H.265 in comparison to H.264 (AVC)


H.265 HEVC Advantages

  • 265 can save around 50% of the bit rate, and coding efficiency can be doubled than H. 264
  • 265 has better compression performance and lower bandwidth utilization ratio. 
  • Offers the potential for a next-generational leap in high-definition video by providing support for ultrahigh-definition video