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H.264 vs. H.265 — A technical comparison. When will H.265 dominate the market?

H.264 vs. H.265 — A technical comparison. When will H.265 dominate the market?

Do you remember those frustrating moments when you watched a video or a movie online and suddenly felt a loss of quality? Finally, it is now possible to stream high-quality videos in crowded network locations quickly and efficiently. Designed to increase video streaming, High-Efficiency Video Coding (HEVC), or H.265, is a video compression standard designed to improve code performance compared to its predecessor, Advanced Video Coding (AVC), or H.264. With the growing growth of Internet video streaming on popular websites such as Netflix and YouTube and 4K cameras gaining a new place in the market, more storage and bandwidth is needed. HEVC promises a 50% reduction in storage as its algorithm uses coding efficiency by encoding video at the lowest rate while maintaining a high-quality image level.

Like many of us, Stream4s believes that HEVC will change how video data is displayed, be it online, on television, and even in the monitoring industry. With this new format, image resolutions around 8192 × 4320 can communicate and stream. Demonstrating the incredible power of this codec, a humble video performance study was conducted between the two codecs to understand how limited this is. Studies have shown that small reductions are very similar to video image quality, where HEVC / H.265 produced a minor decrease of 52% in 480p and 64% in 4K UHD compared to H.264. Aside from this slight significant reduction, compared to H.264, HEVC / H.265 delivers the best viewing quality when compressed with file size or similar bitrate.

Powerful Stream: What did it cost?

Although HEVC is already completed, it is still unpopular. Apart from the fact that various groups patent the codec and are associated with a high license fee, HEVC / H.265 comes with a trade that requires approximately 10x more computer power. Therefore, this new technology was suspended until the hardware market adapted, as was the case with H.264, which was launched in 2003 but gained popularity a few years later. Software manufacturers are already developing their products to support this new format to meet the growing market demand. Although other softwares such as VideoLAN can determine such a codec, software configuration, although flexible, is not an option because hardware configuration is often faster and saves battery life significantly. However, the hardware still replaces significant disk space in the CPU or GPU.

HVAC vs. H.264 – technical comparison

Both codecs work by comparing different parts of the video frame to find the unwanted ones within the following structures. These areas are replaced by short details, which describe the actual pixels. The difference between HEVC / H.265 from H.264 is the ability to increase the size of these areas into larger or smaller blocks, called coding tree units (CTU) in HEVC / H.265. Pattern sizes can range from 4 × 4 to 64 × 64, while H.264 only allows a larger block size of 16 × 16 (CTU is a specific HEVC feature). The advanced separation of CTU and compensation for better mobility and location forecasting require the ability to process video compression signals but has minimal impact on the computational value necessary for mitigation. Motion-compensated for prediction, another significant improvement in HEVC / H.265, pixel indications elsewhere in the same frame (internal forecast) or in another framework (internal estimates).

As mentioned above, CTU is one of the HEVC coding tools. Apart from this, the codec relies on similar computer processing techniques to speed it up and support advanced extensions like AVX / AVX2 and FMA3 / FMA4. The single rectangular regions that separate the image are independent and enable the same processing. In addition, HEVC also has another feature that H.264 does not have: Wavefront Parallel Processing (WPP), a type of decision-making drug that provides productive and effective suppression.

Some of the coding tools used in H.264 continue in this new codec, although a few changes have never been seen before. Encryption for data loss, Context-adaptive binary arithmetic coding (CABAC), is stored in HEVC / H.265 but is slightly improved. Intra speculation is another disturbing feature regarding H.264. HEVC sets up 33 control modes while H.264 rated them eight and allows internal DC prediction and planar prediction. Further improvement is due to Adaptive Motion Vector Prediction, a new way of predicting the middle as it uses image information more shortly.

Due to the significant improvements that can be made to this new codec, Stream4s is confident that HEVC / H.265 will become the standard universal codec as soon as the hardware catches up.

HEVC / H.265 has better viewing quality at lower storage and bandwidth and has a clever encoding algorithm for encoding the movement vectors with greater accuracy and more minor remaining errors. In addition to the advanced method used to predict the middle, this new codec also features an advanced debug filter and a reduced sample used to minimize further technical issues.

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