The current Android box is propagating or supporting H.265. Once H.264 made 1080p storm swept the world, but it was no longer able to lead the 4K trend. With the rapid development of digital video application industry chain, the trend of video application development in the following directions becomes more and more obvious: 1. Higher Definition: The application format of digital video is fully upgraded from 720 P to 1080 P. There are even 4K x 2K and 8K x 4K digital video formats in video applications. 2. High frame rate: The digital video frame rate is upgraded from 30 fps to 60 fps, 120 fps, or even 240 fps. 3. High compression Higher Compression rate: Transmission bandwidth and storage space have always been the most critical resources in video applications. Therefore, obtaining the best video experience in a limited space and pipeline has always been the user's unremitting pursuit. In these respects, H.264 has its enormous limitations. Its high compression rate is so insignificant in the huge size of 4K. It can only look at the sky at a 45-degree angle to prevent tears from falling. . The burden of pulling 4K and even 8K video falls on H.265, the successor to H.264. So what exactly is H.265?
H.265 is a new video coding standard developed by ITU-T VCEG following H.264. The H.265 standard revolves around the existing video coding standard H.264, retaining some of the original technologies and at the same time improving some related technologies. The new technology uses advanced techniques to improve the relationship between codestream, encoding quality, latency, and algorithm complexity to achieve optimal settings. The specific research contents include: improving compression efficiency, improving robustness and error recovery capability, reducing real-time delay, reducing channel acquisition time and random access delay, and reducing complexity. Due to the algorithm optimization, H264 can implement standard definition digital image transmission at a speed of less than 1 Mbps. The H265 can realize transmission of 720P (resolution 1280720) ordinary high-definition audio and video transmission at a transmission rate of 1 to 2 Mbps.
H.265 highlights its technical advantages
1. Larger macro blocks and transform blocks. Compared to the H.264 4x4, 8x8, and 16x16 macroblock types, H.265 introduces macroblocks of 32x32, 64x64, or even 128x128 in order to reduce macros for high-definition digital video. The number of blocks reduces the parameter information used to describe the contents of the macroblocks. At the same time, the size of the transform block is also correspondingly enlarged to reduce the similarity coefficient of transforming neighboring blocks in H.264.
2. Use the new MV (motion vector) prediction method. Different from H.264 motion vector prediction based on space domain, H.265 expands more directions for intra prediction, and expands the set of prediction blocks from the original spatial domain to the time domain and space-time hybrid domain. After the distortion criterion is calculated, the best prediction block is selected. Using this method, in the basic mode test, with the same quality as H.264, an average compression gain of 6.1% is obtained, and the compression gain of a complex image can even be increased to 20%.
3, more consideration of parallel design. The current chip architecture has gradually evolved from single-core performance to multi-core parallelism. H.265 introduces parallel computing ideas such as Entropyslice and WPP, and uses a more parallel coding algorithm, which is more conducive to H.265 in GPU/DSP/FPGA/ ASICs and other highly parallelized CPUs achieve rapid and efficient industrialization.
4. Multi-core processors are gradually replacing traditional single-processors to become mainstream in the market due to their high performance and low power consumption. With the expansion of application requirements and technological progress, multi-core will show its more powerful performance advantages. H.265 video coding technology takes parallel implementation into account when designing. The newly added Tile partitioning mechanism makes the previous coarse-grained data parallelism unit of slices, frames, or GOPs more suitable for parallel implementation on homogeneous multi-core processors. The Dependentslice and WPP mechanisms solve the problem that the entropy coding links in H.264 and other coding technologies cannot be implemented in parallel, making the division of task modules such as DCT, motion estimation, motion compensation, and entropy coding more uniform and significantly improved in the entire coding and decoding process. Parallel speedup.
To us:
In the same picture quality, the H.265 standard saves half the bandwidth of the H.264 standard. In the case of low bandwidth, H.265 can also allow you to get the fine picture quality, rich image details, smooth natural playback. The obvious advantage of "halving the bandwidth and doubling the resolution" for video sites is undoubtedly "dry rain." At present, many video sites already provide the H.265 video standard. We can not only transmit and watch high-definition video on the broadband in the home, but also enjoy these services on devices such as mobile phones and tablet computers!
With the same picture quality, the video size encoded by H.265 will be reduced by about 39-44% compared to H.264. Due to the different methods of quality control measurement, this data will also have corresponding changes. The data obtained through subjective visual testing shows that the quality of H.265 encoded video can be similar to or even better than that of H.264 encoded video when the bit rate is reduced by 51-74%. H.265 will analyze whether there is a moving picture in each frame and then compress the unchanged part. The more static frames, the higher the compression rate. Since most of the video's 90% parts have not changed, this compression guarantees an increase in compression efficiency without degrading the picture quality.
The application of H.265 standard is the trend!
Due to the significant increase in compression ratio, H.265 also puts more stringent requirements on hardware. H.265 decoding has 1.7 to 2.0 times the theoretical amount of H.264 decoding. Previous dual-core A9+ single-core GPUs were able to play H.264 video smoothly, and H.265 video could only let you enjoy the slides. -- At least quad-core A9+ quad-core GPUs need to have enough computing horsepower to cope.
H.265 highlights its technical advantages
1. Larger macro blocks and transform blocks. Compared to the H.264 4x4, 8x8, and 16x16 macroblock types, H.265 introduces macroblocks of 32x32, 64x64, or even 128x128 in order to reduce macros for high-definition digital video. The number of blocks reduces the parameter information used to describe the contents of the macroblocks. At the same time, the size of the transform block is also correspondingly enlarged to reduce the similarity coefficient of transforming neighboring blocks in H.264.
2. Use the new MV (motion vector) prediction method. Different from H.264 motion vector prediction based on space domain, H.265 expands more directions for intra prediction, and expands the set of prediction blocks from the original spatial domain to the time domain and space-time hybrid domain. After the distortion criterion is calculated, the best prediction block is selected. Using this method, in the basic mode test, with the same quality as H.264, an average compression gain of 6.1% is obtained, and the compression gain of a complex image can even be increased to 20%.
3, more consideration of parallel design. The current chip architecture has gradually evolved from single-core performance to multi-core parallelism. H.265 introduces parallel computing ideas such as Entropyslice and WPP, and uses a more parallel coding algorithm, which is more conducive to H.265 in GPU/DSP/FPGA/ ASICs and other highly parallelized CPUs achieve rapid and efficient industrialization.
4. Multi-core processors are gradually replacing traditional single-processors to become mainstream in the market due to their high performance and low power consumption. With the expansion of application requirements and technological progress, multi-core will show its more powerful performance advantages. H.265 video coding technology takes parallel implementation into account when designing. The newly added Tile partitioning mechanism makes the previous coarse-grained data parallelism unit of slices, frames, or GOPs more suitable for parallel implementation on homogeneous multi-core processors. The Dependentslice and WPP mechanisms solve the problem that the entropy coding links in H.264 and other coding technologies cannot be implemented in parallel, making the division of task modules such as DCT, motion estimation, motion compensation, and entropy coding more uniform and significantly improved in the entire coding and decoding process. Parallel speedup.
To us:
In the same picture quality, the H.265 standard saves half the bandwidth of the H.264 standard. In the case of low bandwidth, H.265 can also allow you to get the fine picture quality, rich image details, smooth natural playback. The obvious advantage of "halving the bandwidth and doubling the resolution" for video sites is undoubtedly "dry rain." At present, many video sites already provide the H.265 video standard. We can not only transmit and watch high-definition video on the broadband in the home, but also enjoy these services on devices such as mobile phones and tablet computers!
With the same picture quality, the video size encoded by H.265 will be reduced by about 39-44% compared to H.264. Due to the different methods of quality control measurement, this data will also have corresponding changes. The data obtained through subjective visual testing shows that the quality of H.265 encoded video can be similar to or even better than that of H.264 encoded video when the bit rate is reduced by 51-74%. H.265 will analyze whether there is a moving picture in each frame and then compress the unchanged part. The more static frames, the higher the compression rate. Since most of the video's 90% parts have not changed, this compression guarantees an increase in compression efficiency without degrading the picture quality.
The application of H.265 standard is the trend!
Due to the significant increase in compression ratio, H.265 also puts more stringent requirements on hardware. H.265 decoding has 1.7 to 2.0 times the theoretical amount of H.264 decoding. Previous dual-core A9+ single-core GPUs were able to play H.264 video smoothly, and H.265 video could only let you enjoy the slides. -- At least quad-core A9+ quad-core GPUs need to have enough computing horsepower to cope.