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 designed to play high quality video for streaming streaming media. It can utilize a very narrow band, to reconstruct the technology, compress and transmit data through frame reconstruction, to obtain the best image quality using the least amount of 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 established by 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, the low rate technology of H.264 has played a crucial role.
While users get high-quality smooth images, it is great to save download time and data traffic, which 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.
H.264 characteristic advantage
1, low code stream: compared to compression techniques such as MPEG2 and MPEG4 ASP, the amount of data compressed by H.264 is only 1/8 of MPEG2 1/8 and MPEG4 1/3 of MPEG2.
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.).
H.265 encoding technology
The H.265 technology is the new video coding standard established after ITU-T VCEG followed by 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.
What is H.265 better than H.264?
1. Have better compression: HEVC provides significant improvements in compression compared to the H.264 codec. In fact, the efficiency of the HEVC compressed video is twice as high as H.264. With HEVC, the same visual quality video only takes half of the space. Alternatively, video with the same file size and bit rate can present better quality.
2. Improve compression efficiency: H264 is optimized by algorithm, and can achieve a standard-cleaned digital image transfer at a speed of 1 Mbps; H265 can realize the transmission of 720P (resolution 1280 * 720) to transmit 720P (resolution 1280 * 720). 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.
3, Ultra HD Image Quality: H.265 can transmit higher quality network videos under limited bandwidth, which means that only half bandwidth coded by H.264 can transmit the same quality video. At present, the user-care 4k, H.265 supports Super HD video of 4K (4096x2160) and 8K (8192x4320) pixels. Since the amount of data in 4K video is 4 to 8 times the high definition, a higher efficiency compression coding algorithm is required, and the encoding efficiency of H.265 is twice the H.264 according to the public data.
4, image transfer: H264 Due to the algorithm optimization, the standard clearance can be realized at a speed of less than 1 Mbps; H265 can achieve 720P (resolution 1280 * 720) normal HD video transmission using a transmission speed of 1 to 2 mbps. 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.
5. Transmission Broadband: H.265 can transmit higher quality network videos under limited bandwidth, which means that only half bandwidth coded by H.264 can transmit the same quality video. At present, the user-care 4k, H.265 supports Super HD video of 4K (4096x2160) and 8K (8192x4320) pixels. Since the amount of data in 4K video is 4 to 8 times the high definition, a higher efficiency compression coding algorithm is required, and the encoding efficiency of H.265 is twice the H.264 according to the public data.
H.265 encoder advantage
Thousands of Kiloview latest H.265 standards basic inherited H.264 framework, H264 is only lower than 1Mbps transmission due to algorithm optimization; H265 can be transmitted 720P by transmitting transmission speed using 1 ~ 2Mbps (resolution Rate 1280 * 720) Ordinary HD video transmission. This means that the limited bandwidth H.265 is capable of transmitting higher quality network videos, while only the original half band width can play the same quality video.
In addition, all series HD encoders support dual stream output, the primary code rate supports video coding of up to 1080p60 Hz, sub-code stream supports video encoding of 720p60Hz, but also highlights to 16 live platforms at the same time;
Extended reading:
H.266 encoding technology
With the growth of global Internet video demand, MPEG is pushing 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. Read more
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