MPEG-4 encoding technology MPEG-4: MPEG-4 is a solution suitable for low transmission rate applications, MPEG-4 is developed on the basis of MPEG-1, MPEG-2, is to play the high quality of streaming media Special design, it can be used to use a narrow band, compressed and transmitted data, compress and transmit data, to obtain the best image quality in the least data. The MPEG-4 standard is based on the encoding method of object and content, and the traditional image frame coding method is different. It only processes the difference between the image frame and the frame, discard the same image element, and thus greatly reduces the volume of the synthetic multimedia file. To obtain a high-definition reduction image in a smaller file volume. In other words, the same raw image, the MPEG-4 encoding standard has a higher compression ratio.
H.264 Encoding Technology H.264 is a video codec technology standard for ITU-T ITU and ISO International Standardization, H.264 is a high performance video codec technology. The maximum advantage of H.264 is to have a high data compression ratio. Under the conditions of the same image quality, the compression ratio of H.264 is 2 times the MPEG-2, which is 1.5 to 2 times the MPEG-4. An original file is a video of 102G size. After the H.264 encoding, it becomes 1 G, and the compression is more than 102: 1. Therefore, H.264's low yard ratio technology has played a vital role. While users get high-quality smooth images, it is greatly saved download time and data traffic, and greatly reduces image storage space. H.264 is established on the basis of MPEG-4 technology, its codec process mainly includes 5 parts: inter-frame and intra prediction, transform and reverse transformation, quantization, and Inverse quantization, loop filter, entropy coding.
After years of development, video surveillance technology has experienced from the original D1 standard, and advances to 4K HD and 8K super clear era. The improvement of front-end pixels gives a huge pressure to video transmission and backend recording stores. Under the same encoding compression ratio, users need to invest more equipment and funds, so the development of codec technology has been in recent years. Due to the high compression performance of H.264, the mainstream video on the market is basically H.264 standard. The feature advantage of H.264 1, low-code stream: compared with MPEG2 and MPEG4 ASP compression technology, the amount of data compressed by H.264 is only the amount of MPEG2 1/8, MPEG4 1 / 3. Obviously, the use of H.264 compression technology will greatly save users' download time and data traffic charges. 2, high quality image: H.264 provides continuous, smooth high quality image (DVD quality). 3, fault-tolection ability: H.264 provides the necessary tools that solve the wrong packets such as packets that are easy to occur in unstable network environments. 4, network adaptability: H.264 provides network adaptation layers, so that the File of H.264 can be easily transmitted on different networks (eg, Internet, CDMA, GPRS, WCDMA, CDMA2000, etc.). Extended reading: H.265 Encoding Technology H.265 Technology is the new video coding standard established after ITU-T VCEG following H.264. The H.265 standard revolves around the existing video coding standard H.264, reserves the original technologies, and improves some related technologies. New technology is used to improve the relationship between code stream, coding quality, delay and algorithm complexity, reach optimization settings. H.264 Due to the algorithm optimization, the standard clearance can be realized at a speed of 1 Mbps, and H.265 can implement 720P (resolution 1280 * 720) to implement 720P (resolution 1280 * 720). At present, H.265 has become a video mainstream decoding technology. The H.265 contrasts the traditional H.264, the code rate is reduced by 50%, and the compression ratio is high. The H.265 is intended to transmit higher quality network videos under limited bandwidth, and only the original half band width can play the same quality video. The H.265 standard also supports 4K (4096 × 2160) and 8K (8192 × 4320) ultra HD video. It can be said that the H.265 standard allows network video to keep up with "high resolution" footsteps. Thousands of view as audio and video IP transmission solution experts, H.265 or H.264 audio and video transmission solutions are available.
H.266 Coding Technology With the growth of global Internet video demand, MPEG is driving H.266 / VCC and other two standards. The first part of the MPEG-5 is also referred to as the basic video coding (EVC), and the second portion is also referred to as low complexity enhancement video coding (LCEVC). H.266 multi-function video coding codec standard, the new H.266 / VCC codec is greatly improved in the case where the sharpness is unchanged, and the data compression efficiency is greatly improved, and the amount of data is reduced by 50%. H.266 will decrease approximately 50% of data needs. Using the previous HEVC codec, transfer a 90-minute ultra HD (UHD) video requires approximately 10GB of data, while H.266 can do this only 5GB. H.266 is mainly used for 4K and 8K streaming media videos, which will allow users to store more HD videos and reduce the amount of data for mobile networks.
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