[ Huaqiang Security Network News ] Video capture card is a widely used hardware product in multimedia soft products. For its video compression method, it is divided into soft compression and hard compression. According to my experience, these two methods have their own characteristics. Let's talk about the situation of the video surveillance industry. 
First, software compression <br> Software compression video capture card is a pure acquisition card, uncompressed image data directly into the system memory, and then through the software for image compression.
On the hardware platform, the early large-volume use of BT848, BT878 chip, the image quality is relatively general, and now with SAA7130, SAA7134 and other chips, the image quality has improved. There are also some high-definition capture cards in other related industries, and the chips used are different.
Since the uncompressed image data is to be compressed into the system memory and sent to the graphics card memory for monitoring, the soft compression card has a higher bandwidth requirement on the system bus. In early products, monitoring and compression were not independent of each other, and current products do not know whether to solve this problem completely.
Since the soft compression card is compressed by the main CPU, the system capacity is limited. At present, the real-time processing of the large number of paths cannot be achieved, and the P42G generally cannot process 16 channels of data in parallel.
On the other hand, the soft compression card is relatively simple, the hardware compatibility is good, the flexibility of the software is relatively large, and the price is very cheap.
In the video surveillance industry, soft compression cards were used in early digital products. Later, due to the higher performance of hardware compression cards, they were gradually reduced in China. In the past one or two years, due to the rapid increase in computer performance, soft compression cards seem to have a new vitality.
Second, hardware compression <br> Hardware compression card is to increase the parallel video compression capability by adding a dedicated compression chip (ASIC solution) or DSP to the acquisition card. The earliest large-scale application to the monitoring industry in China is the MPEG-I card using Taiwan's Winbond 9901 chip. However, this solution has many problems in terms of stability and compression performance, and has now been eliminated.
Later, Philips' TM13xx chip occupied a major market share. At present, the first few major board companies in China rely on this hardware platform. Since 2004, TI's DM64 solution has also been squeezed in, competing with Philips' TM15xx solution. These two programs have their own advantages, DM64 processing ability is stronger, and Philips is experienced, after all, in terms of image quality is slightly better.
Compared to software compression cards, the concurrent real-time performance of hardware compression cards can be done very high, and there is a lot of room for intelligent processing. However, due to the more complicated hardware, the compatibility of the hardware compression card is less, and the price is more expensive.
At present, hardware compression cards have become a low-tech product in China, but market factors and corporate strength have played a more important role. Industry bosses have begun to abandon middlemen and developers directly to customers, while smaller manufacturers still promote products through agents and developers for strength reasons.
There is a very interesting phenomenon, that is, the hard compression card that is dominant in China is not too hot in foreign countries. Many foreign products are still using JPEG non-real-time soft compression products, and the main points of concern may be different.
On the hardware platform, the early large-volume use of BT848, BT878 chip, the image quality is relatively general, and now with SAA7130, SAA7134 and other chips, the image quality has improved. There are also some high-definition capture cards in other related industries, and the chips used are different.
Since the uncompressed image data is to be compressed into the system memory and sent to the graphics card memory for monitoring, the soft compression card has a higher bandwidth requirement on the system bus. In early products, monitoring and compression were not independent of each other, and current products do not know whether to solve this problem completely.
Since the soft compression card is compressed by the main CPU, the system capacity is limited. At present, the real-time processing of the large number of paths cannot be achieved, and the P42G generally cannot process 16 channels of data in parallel.
On the other hand, the soft compression card is relatively simple, the hardware compatibility is good, the flexibility of the software is relatively large, and the price is very cheap.
In the video surveillance industry, soft compression cards were used in early digital products. Later, due to the higher performance of hardware compression cards, they were gradually reduced in China. In the past one or two years, due to the rapid increase in computer performance, soft compression cards seem to have a new vitality.
Second, hardware compression <br> Hardware compression card is to increase the parallel video compression capability by adding a dedicated compression chip (ASIC solution) or DSP to the acquisition card. The earliest large-scale application to the monitoring industry in China is the MPEG-I card using Taiwan's Winbond 9901 chip. However, this solution has many problems in terms of stability and compression performance, and has now been eliminated.
Later, Philips' TM13xx chip occupied a major market share. At present, the first few major board companies in China rely on this hardware platform. Since 2004, TI's DM64 solution has also been squeezed in, competing with Philips' TM15xx solution. These two programs have their own advantages, DM64 processing ability is stronger, and Philips is experienced, after all, in terms of image quality is slightly better.
Compared to software compression cards, the concurrent real-time performance of hardware compression cards can be done very high, and there is a lot of room for intelligent processing. However, due to the more complicated hardware, the compatibility of the hardware compression card is less, and the price is more expensive.
At present, hardware compression cards have become a low-tech product in China, but market factors and corporate strength have played a more important role. Industry bosses have begun to abandon middlemen and developers directly to customers, while smaller manufacturers still promote products through agents and developers for strength reasons.
There is a very interesting phenomenon, that is, the hard compression card that is dominant in China is not too hot in foreign countries. Many foreign products are still using JPEG non-real-time soft compression products, and the main points of concern may be different.
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