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From the beginning of dial-up internet to digital routing, the content of the internet has evolved from text and images to include video. Network video is increasingly occupying a major position in the new media era. The internet is changing people's behavior habits, but high-definition real-time image data carries huge amounts of data, and transmission problems are constantly being exposed.
In order to transmit high data volume videos under limited bandwidth, audio and video application systems use video encoding and decoding to compress and encode the images, thereby greatly reducing the data volume before transmitting through the network. Currently, these encoding devices mainly use the H264 encoder technology. For many years, H 264 streaming encoder has done a good job in video coding, compression, and transcoding, and has been widely used for over ten years. However, H.264 also has certain limitations. For example, due to the great increase in image resolution, the information represented by a single macroblock is greatly reduced, and the similarity of low-frequency coefficients after the 4*4 or 8*8 macroblocks used by H.264 are transformed into integers is greatly increased, resulting in a lot of redundancy, which significantly reduces the compression efficiency of H.264 for high-definition video. Presently, 720P and 1080P high-definition images have become the mainstream of audio and video application systems. In the future, image resolution will reach 4K (4096*2160) and 8K (8192*4320), and H.264 will be unable to meet the demand for high-definition video image transmission.
The emergence of the new-generation video coding technology, the H.265/HEVC high-efficiency video coding technology, provides a means to solve this problem. H.265/HEVC retains some more mature technologies of the existing mainstream video coding standards H.264 and inherits its existing advantages. At the same time, advanced coding technologies such as coding segmentation and prediction coding based on quad-tree structures are adopted. The video compression efficiency will be increased by about half compared with H.264, making it easy to transmit 1080P images under low bandwidth while also supporting the transmission of 4K and 8K high-definition images.
Industry vendors have launched research and application of products based on H.265/HEVC encoding, and some manufacturers have already achieved large-scale application of H.265/HEVC hdmi video encoder, launching H.265/HEVC high-definition encoders that support various video formats such as HDSDI, DVI, and HDMI. At the same image quality, the data volume of the encoder model is only 1/16 of MPEG2, 1/6 of MPEG4, and 1/2 of H.264. It can also achieve stable transmission in an unstable network environment with up to 25% packet loss rate. As users demand for high-definition and ultra-high-definition video, the application of H265 encoders will be widely used.
