What does h265 encoding mean? What is the difference between H265 encoding and H264 encoding?-EEWORLD

Collect

MPEG-4 Coding Technology

MPEG-4: MPEG-4 is a solution suitable for low transmission rate applications. MPEG-4 is developed based on MPEG-1 and MPEG-2. It is specially designed for playing high-quality video of streaming media. It can use very narrow bandwidth and frame reconstruction technology to compress and transmit data in order to obtain the best image quality using the least data.

The MPEG-4 standard is an object and content-based coding method. Unlike the traditional image frame coding method, it only processes the difference elements between image frames and discards the same image elements, thus greatly reducing the size of the synthesized multimedia file, so that a high-definition restored image can be obtained with a smaller file size. In other words, for the same original image, the MPEG-4 coding standard has a higher compression ratio.

H.264 Coding Technology

H.264 is a video coding and decoding technology standard jointly developed by ITU-T International Telecommunication Union and ISO International Organization for Standardization. H.264 is a high-performance video coding and decoding technology.

The biggest advantage of H.264 is its high data compression ratio. Under the condition of the same image quality, the compression ratio of H.264 is more than twice that of MPEG-2 and 1.5 to 2 times that of MPEG-4.

An original video file of 102G size becomes 1G after H.264 encoding, and the compression ratio reaches 102:1. Therefore, the low bit rate technology of H.264 plays a vital role.

While users obtain high-quality and smooth images, it greatly saves download time and data traffic, and also greatly reduces image storage space.

H.264 is built on the basis of MPEG-4 technology. Its encoding and decoding process mainly includes five parts: inter-frame and intra-frame prediction (Estimation), transformation (Transform) and inverse transformation, quantization (Quantization) and inverse quantization, loop filtering (Loop Filter), and entropy coding (Entropy Coding).

After years of development, video surveillance technology is experiencing a transition from the initial D1 standard definition image to the 4K high definition and 8K ultra-definition era. The improvement of front-end pixels has brought tremendous pressure to video transmission and back-end video storage. Under the same encoding compression ratio, users need to invest more equipment and funds. Therefore, the development of encoding and decoding technology has also made great progress in recent years. Due to the high compression performance of H.264, the mainstream videos on the market currently basically adopt the H.264 standard.

Features and Advantages of H.264

1. Low bit rate: Compared with compression technologies such as MPEG2 and MPEG4 ASP, under the same image quality, the amount of data compressed by H.264 technology is only 1/8 of MPEG2 and 1/3 of MPEG4.

Obviously, the adoption of H.264 compression technology will greatly save users' downloading time and data traffic charges.

2. High-quality images: H.264 can provide continuous, smooth, high-quality images (DVD quality).

3. Strong fault tolerance: H.264 provides the necessary tools to solve errors such as packet loss that are prone to occur in unstable network environments.

4. Strong network adaptability: H.264 provides a network adaptation layer, which allows H.264 files to be easily transmitted on different networks (such as the Internet, CDMA, GPRS, WCDMA, CDMA2000, etc.).

H.265 Coding Technology

H.265 technology is a new video coding standard developed by ITU-T VCEG after H.264. The H.265 standard revolves around the existing video coding standard H.264, retains some of the original technologies, and improves some related technologies. The new technology is used to improve the relationship between bit rate, encoding quality, delay and algorithm complexity to achieve the optimal setting. Due to algorithm optimization, H.264 can achieve standard definition digital image transmission at a speed lower than 1Mbps, while H.265 can achieve 720P (resolution 1280*720) ordinary high-definition audio and video transmission at a transmission speed of 1 to 2Mbps.

Currently, H.265 has become the mainstream video codec technology. Compared with traditional H.264, H.265 has a 50% lower bit rate and a higher compression ratio.

H.265 is designed to transmit higher-quality online videos under limited bandwidth, requiring only half the original bandwidth to play videos of the same quality. The H.265 standard also supports 4K (4096×2160) and 8K (8192×4320) ultra-high-definition videos. It can be said that the H.265 standard allows online videos to keep up with the "high-resolution" of display screens.

So why is H.265 better than H.264?

1. Better compression: HEVC offers significant improvements in compression compared to the H.264 codec. In fact, HEVC compresses video twice as efficiently as H.264. With HEVC, a video of the same visual quality takes up only half the space. Alternatively, a video with the same file size and bit rate can present better quality.

2. Improve compression efficiency: Due to algorithm optimization, H264 can achieve standard-definition digital image transmission at a speed lower than 1Mbps; H265 can achieve 720P (resolution 1280*720) ordinary high-definition audio and video transmission at a transmission speed of 1~2Mbps. The H.265 standard also supports 4K (4096×2160) and 8K (8192×4320) ultra-high-definition videos. It can be said that the H.265 standard allows network videos to keep up with the "high-resolution" of display screens.

3. Ultra-high-definition image quality: H.265 can transmit higher-quality network videos under limited bandwidth, which means that only half the bandwidth of the original H.264 encoding is needed to transmit videos of the same quality. In terms of 4K, which users are currently concerned about, H.265 supports ultra-high-definition videos of both 4K (4096x2160) and 8K (8192x4320) pixels. Since the data volume of 4K video is 4 to 8 times that of HD, a more efficient compression encoding algorithm is required. According to public information, the encoding efficiency of H.265 is twice that of H.264.

4. Image transmission: Due to algorithm optimization, H.264 can achieve standard-definition digital image transmission at a speed lower than 1Mbps; H.265 can achieve 720P (resolution 1280*720) ordinary high-definition audio and video transmission at a transmission speed of 1~2Mbps. H.265 is designed to transmit higher-quality network videos under limited bandwidth, and only half of the original bandwidth is needed to play videos of the same quality.

5. Transmission bandwidth: H.265 can transmit higher quality network videos under limited bandwidth, which means that only half the bandwidth of the original H.264 encoding is needed to transmit the same quality video. In terms of 4K, which users are currently concerned about, H.265 supports both 4K (4096x2160) and 8K (8192x4320) pixel ultra-high-definition videos. Since the data volume of 4K video is 4 to 8 times that of HD, a more efficient compression encoding algorithm is required. According to public information, the encoding efficiency of H.265 is twice that of H.264.

H.265 Encoder Advantages

KILOVIEW's latest H.265 standard basically inherits the framework of H.264. Due to algorithm optimization, H264 can only transmit standard-definition digital images at a speed lower than 1Mbps; H265 can transmit 720P (resolution 1280*720) ordinary high-definition audio and video at a transmission speed of 1~2Mbps. This means that H.265 can transmit higher-quality network videos under limited bandwidth, and at the same time, only half of the original bandwidth is needed to play videos of the same quality.

In addition, all series of HD encoders support dual-stream output, the main bit rate supports up to 1080p60Hz video encoding, and the sub-stream supports 720p60Hz video encoding, and can simultaneously push streams to up to 16 live broadcast platforms;