H.264 / AVC is the latest standard for the advantages of the two major organizations, the advantages of H.263 + and MPEG4, and the most valuable part is undoubtedly a higher data compression ratio. Under the same image quality conditions, the data compression ratio of H.264 is 2 times higher than H.263, 1.5 times higher than MPEG-4.
The evolution of digital video codec technology
International standards are usually developed by the International Standardization Organization ISO on the basis of Technical Suggestions for Telecommunication Alliance ITU. The digital video codec standard has also experienced multiple changes, and the H264 standard has risen moving image compression technology to a higher stage, providing high quality image transfer on lower bandwidth is the high-quality application highlight of H.264. The promotion and application of H.264 is higher in the system of video terminals, gatekeepers, gateways, and MCUs, which will strongly promote the continuous improvement of video conferencing soft equipment in various aspects.
H.264 core competitiveness
The most valuable part of H.264 is undoubtedly a higher data compression ratio. The basic principle of compression technology is to filter non-important information in the video file to allow data to be transmitted in the network faster. Under the same image quality conditions, the data compression ratio of H.264 can be 2-3 times higher than the MPEG-2 high of the MPEG-2 high than the MPEG-4 high than the MPEG-4 high. Because of this, after H.264 compressed video data, less bandwidth required during network transmission, and more economical.
When the MPEG-4 requires a 6Mbps transmission rate match, H.264 only requires only 3 Mbps-4Mbps transmission rate. We use transportation to do more metaphors: also use a truck to transport a large box, if MPEG-4 can lose half of the box, then H.264 can lose the box to the original 1/4, When the weight of the truck is not changed, the H.264 is twice as the MPEG-2 is doubled.
H.264 Get superior performance is a substantial increase in computational complexity, such as hierarchical design, multi-frame participation, multi-mode motion estimation, improved intra prediction, etc., significantly increased prediction accuracy, thus obtaining more than other The standard is much more compressed.
Constantly improved hardware processing capabilities and continuous optimized software algorithms are the foundation of H.264. As early as ten years ago, the CPU for several tens of trillion reached top, and now the ordinary desktop, the clue of CPU has been up to several thousand megabytes. According to Moore's law, the capacity of the chip unit is doubled every 18 months, so the computational complexity of H.264 is slightly insignificant relative to performance improvement. What's more, new computing methods are endless, and the H.264's hunger demand for processing speeds is relatively alleviated.
Comparison of H.264 and MPEG-4
In the case of a very low rate (32-128 kbps), H.264 has a performance multiplication effect compared to MPEG-4, ie the H.26L media stream of the same yard ratio compared to the MPEG-4 media stream. 26L has a gain of approximately 3 pieces (the quality level is multiplied). 32kbps H.26L media stream, its hiker is similar to 128K MPEG-4 media flow. That is, in the same picture quality, the syrup rate of H.264 is only a quarter of MPEG-4. Technology area
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