By PURPLELEC | 06 June 2024 | 0 Comments
The difference between hard compression card and soft compression card in video capture card
The difference between the hard compression card and the soft compression card of the DVR is that the hard compression card of the DVR compresses the video signal collected by the acquisition chip through the DSP (data signal processing chip, equivalent to a CPU) compression chip, while the soft compression card only has an acquisition chip and no DSP. It compresses the collected video signal on the computer's CPU through software.
In popular terms, the difference is nothing more than whether the CPU is on the card or on the board. At first, there was a soft compression card, but because the CPU speed could not keep up, a DSP was added to the card separately, and then the hard compression card of the DVR was produced. Now, because the CPU speed has developed very quickly, it can fully meet the stable operation of the soft compression card, and the CPU price is also very low, so a large number of soft compression cards have emerged.
However, it cannot be simply assumed that the hard compression card of the DVR is better or the soft compression card is better. Different companies use different solutions, workmanship, and software. There are good and poor hard compression of DVRs; there are good and poor soft compression, and the main effort is in the software. Soft compression cards can now implement H.264 compression algorithm just like hard compression of DVRs. If done well, the performance is not worse than that of hard compression of DVRs, or even better than that of hard compression of DVRs. Domestic customers prefer hard compression of DVRs, while foreign customers prefer soft compression.
The current technology often moves faster than the market. I personally prefer soft compression cards, because the DSP of hard compression of DVRs is more expensive and has higher costs. From the perspective of the cost of technical implementation, soft compression is definitely lower than that of hard compression of DVRs. Moreover, we have gone from MPEG 1 to the current H.264. Every time the technology is upgraded, customers who use hard compression cards of DVRs need to make repeated investments to complete the technology upgrade, while soft compression can be upgraded from MPEG 4 to H.264 through software upgrades; many people always like the lower system resource utilization rate than hard compression of DVRs, but they don’t know that the extra system resources are wasted, and the DSP bought with more money is used to do the calculation work. Just like when people bought computer sound cards, they all liked to use independent sound cards or hard sound cards with integrated sound effect chips at the beginning, but now most people buy computers with soft sound cards.
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