At present, many cameras use H.265 coding standards, and the H.264 encoded camera gradually decreases, why will H.265 will pop? What is the difference between H.264 and H.265?
First, what is H.265
H.265 is a new video coding standard established after ITU-TVCEG followed by ITU-TVCEG. The H.265 standard surrounds the existing video coding standard H.264, reserves the original technologies, and improves some related technologies. New technology uses advanced technology to improve the relationship between code stream, coding quality, delay and algorithm complexity, reaching optimization settings. Specific research contents include: increasing compression efficiency, improving robustness and error recovery capabilities, reducing real-time delays, reducing channel acquisition time and random access delay, reducing complexity, etc. Since the algorithm optimization, the H265 can be achieved at a speed of less than 1 Mbps, and H265 can realize the transfer of 720P (resolution 1280 * 720) to transmit 720P (resolution 1280 * 720) to transmit the 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. This also means that our smartphones, tablets and other mobile devices will be able to play directly online 1080P full HD 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.
Second, what is H.264
H.264, is also the tenth part of the MPEG-4, which is proposed by the ITU-T video coding expert group (VCEG) and ISO / IEC Dynamic Image Expert Group (MPEG) jointly composed of JVT, JointVideo Team) Highly compressed digital video codec standard. This standard is generally referred to as H.264 / AVC (or AVC / H.264 or H.264 / MPEG-4AVC or MPEG-4 / H.264 AVC) to express its two developers.
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. For example, if the size of the original file is 88GB, it is 3.5GB after compressing the MPEG-2 compression standard, and the compression ratio is 25: 1, and the compression ratio is compressed by the compression standard to 879MB, from 88GB to 879MB, The compression ratio of H.264 is an amazing 102: 1. Low bitrate plays an important role in the high compression ratio of H.264, compared to compression technologies such as MPEG-2 and MPEG-4ASP, the H.264 compression technology will greatly save users' download time and data. Traffic charges. It is particularly worth mentioning that H.264 also has a high quality image while having a high compression ratio, as in this way, after the H.264 compressed video data, less bandwidth required in the network transmission process, It is also more economical.
Third, H.265 is different from H.264
Before discussing H.265, we may wish to first understand H.264. H.264 is also known as MPEG-4AVC (AdvanceDvideo Coding, Advanced Video Coding) is a video compression standard, and is also a recorded, compressed and release format for high-precision video. H.264 is famous for its codec standard for a Blu-ray disc, and all Blu-ray players must be able to decode H.264. More importantly, because Apple has finally abandoned Adobe's VP6 encoding, I chose H.264. This standard also walked thousands of households with billions of iPad and iPhone, became the current video coding field. Absolute overlord accounts for more than 80% of the share. H.264 is also widely used in network streaming media data, various high-definition television broadcasts, and satellite TV broadcasts. H.264 has some new features compared to previous coding standards, such as motion compensation, change block size motion compensation, intra predictive coding, etc., H.264 is more than other coding standards by using these new features. High video quality and lower code rates have been widely approved by people.
The H.265 / HEVC encoding architecture is similar to the architecture of H.264 / AVC, which mainly comprises: intra prediction, inter-intermediction, transform, quantization, Go to block filters, entropy codes and other modules. However, in the HEVC coding architecture, the whole is divided into three basic units, namely: Coding Unit, Cu, predictor (PU), and Transform Unit, TUs, respectively.
4, how to calculate the video storage under the technology of H.264 and H.265
1, H.264 technical hard disk capacity calculation
Speaking of calculation, what do we have to calculate? In addition to the number of cameras, there is an important value: code rate! Under normal circumstances, the size of the stream is, the greater, such as We often use the 130W camera, the code stream is 2MB / s, which is 2048kbps. Then I know the code stream, time, channel number, we can directly set the formula.
The formula is as follows: Code rate × 3600 × 24 ÷ 8 ÷ 1024 ÷ 1024 = 1d (one day)
Codeflow table
It should be measured for the code stream, so our capacity should also be converted in seconds, 3600, is 1 hour, 24 is 24 hours a day, 8, is byte, 1024 should be the code stream is The MB is unit, so that the conversion G is to be divided by 1024, replace it to T, then 1024. Fruit is 1 day. Party A needs how long it is stored, and then it is OK by the number of days.
The above is the calculation method of H.264, then let's take a look at the application of H.265 technology.
Second, H.256 technology hard disk storage calculation
Example:
H.264 technology, 4 300W storage probably: 60g * 4 * 30 = 7.2T
H.265 technology, 4 300W storage is probably: 30g * 4 * 30 = 3.6T,
This is still stored, let's take a look at the bandwidth. In the past, H.264 is required to watch the HD screen of 1 130W pixels remotely, it takes 6m uplink bandwidth, while H.265, 4M network can see a 300W HD picture. 2 200W screens.
Therefore, the cost of reduction is not just a hard disk storage, of course, there is a switch.
b, how to support H.265?
Is it that I use the old camera to receive a video recorder of H.265, can you store it? No, for the webcam and recorder, both parties support H.265 technology.
If there is one support, the other party does not support it? Rest assured, the same as other technical equipment, compatible, that is, other functions are normal in addition to storage reduction.
How to calculate C, H.265 Storage?
Ordinary camera is about 21g a day, is it directly divided by 2? actually not. A more concise method is coming!
200w≈20g
300W ≈30g
400W ≈40g, read full text
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