H.265 is different from H.264

H.265 is different from H.264, the same quality volume is only half, the bandwidth occupies half, the quality of the picture quality is more delicate, etc. The advantage is introduced: First, compression ratio: H.265 compression ratio is higher, half traffic Compared to H.264, the maximum advantage of H.265 is to have higher compression ratios. This can be seen from the H.265 name, H.265, HEVC (High Efficiency Video Coding, High Efficiency Video Coding), the most important use is to further reduce the flow required to reduce the storage and The cost of transmission. Taking H.265 in 27 proposals as an example, H.265 requires 1080P movies compressed by H.264 in the premise of maintaining the same PSNR in the best coding template (PROFILE) % Or so the amount of data, and can be further improved to 50% in the image quality. Therefore, in order to achieve this goal, H.265 is more advanced, more flexible encoding units than H.264. In the past, H.264 will be configured in 16 x 16 pixels (or 16 x 8, 8 x 8, 8 x 4, 4 x 4, etc.), cutting the screen into several large sectors, and these giants The block is the minimum element when encoding. H.265 is determined by manual setting of the cutting screen from the user, transferring to the encoder, allowing the encoder to cut the screen into several encoding as a size of 16x 16, 32 x 32, 64 x 64. Tree unit, generally, the larger the block size, the better the compression efficiency. It is through a series of optimizations, the H.265 video encoding compression technology allows the same picture and mass of the movie file capacity to reduce half, and the time-consuming time can be reduced by half, provides limited network bandwidth A more perfect video compression solution. H.265 comparison with H.264 Second, lower transmission code rate Under the same image quality, the amount of data is only 1/16 of MPEG2, 1/6, H.264 of MPEG4, 1/2 of MPEG4. Third, the picture quality contrast: H.265 is more delicate skin more than H.264 Maybe you will think that since H.265 has a high compression ratio, the picture quality must have lost. For this problem, everyone is relieved. In H.264 and other coding techniques, the data between each giant area is completely independent, no dependence, which is easily influenced by the distortion generated during the encoding process, and noise is generated in the boundary area of ​​the giant block, resulting in all giants. When the block is combined into a complete picture, the image cannot fully merge. The H.265 leads to a deblocking filter function. Deblocking Filter detects data from the giant block, re-establishing data dependencies between giant blocks, and minimizes the edge area to improve the overall image quality.

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