I’m sure you’ve heard of h. 265 and h. 264, and you’ve seen the technical terms.4K video encoding in the format h. 265 will be supported on all TVS, and h. 265 will be supported on video monitoring system.But in the case of unused, it’s hard to really know the difference, and today we’re going to take a moment to understand the difference.
H.264 is the compression video coding standard proposed by video coding expert group.
H.264 standards include: access unit segmentation, additional enhancement information, basic image coding, redundant image coding, real-time decoding refresh, imaginary reference decoding, and imaginary code flow scheduler.
Technical terms can be a mouthful, right?In fact, we do not need to understand the specific video coding process and compression format standards.Just know that h.264 is the next generation digital video compression format after MPEG4.
H.265 standard is based on H.264 improve some techniques, can play the same quality video with half the bandwidth. It’s clear that computers, phones, tablets, TVS, including our monitoring industry, can all save more bandwidth and capacity with the same video quality when h. 265 is used.
With the improvement of network technology and the processing capacity of camera chip, the security monitoring hd video 720P, 1080P has gradually become popular. 4K hd video is beginning to appear in the monitoring area, but we cannot meet the requirements based on the previous mpeg-2, mpeg-4, h. 264/AVC. Thus h. 265 came into being, and the compression efficiency was doubled.
The other day I was talking to a friend who works on a surveillance project, about the h. 265 HDD video recorder now in use, same number of days that video storage requirements, you can save half of the capacity. For example, I used to use 8T hard disk, but now I can use 4T hard disk. I joke that I installed 8T hard disk at the beginning, and I can even take one back, and I can guarantee the same storage days.
Let’s take a look at the difference between video storage in h. 264 and h. 265. For example, we usually use 200W webcams, and the bitstream is 4MB/S, which is 4096kbps. Knowing the bitstream, time and channel number, we can directly calculate the capacity of one day.
Formula ：1DAY=Code stream×3600×24÷8÷1024÷1024
Note: because the code stream unit is seconds, so we want to convert hours into 3600 seconds to calculate, 24 hours a day, 8 is the byte, we formula to ÷8 here, is to calculate to MB, ÷1024, convert to G, ÷1024, convert to T.The storage capacity for a day is calculated, and the number of days the customer needs to keep it is multiplied by the number of days.
Comparison table of bitrate between h. 265 and h. 264 at various resolutions
So h. 265 storage is the compression of the code stream, the calculation of the storage space on the basis of h. 264 divided by 2, is the capacity of a day, should be 40%-60%, estimated by 2 no problem.200W pixel per day 20G;300W pixel a day 30G;400W per pixel, 40G per day.
How does the device that supports h. 265 work? Is the storage space halved by connecting the previous webcams directly to the h. 265 video recorder? It says no.The camera and NVR must support h. 265 technology at the same time. You can see whether h. 265 is supported in the device parameter description.If the camera and NVR are supported by one party, but not the other party, then it is compatible with the downward direction like other devices, which means normal use. All other functions can be realized, except the storage can’t be halved.