The audio and video compression card is an important product of digital video surveillance, mainly with a soft compressed card and a hard compression card. Soft compression card, since the PCI bus data throughput is too large, and mainly H.264 image compression processing is mainly made by the CPU, it results in poor stability. The main programs of the hard compression card have DSP and ASIC programs, the technical difficulty of the DSP program, high development threshold; early ASIC chip does not meet the special needs of the monitoring market, such as dynamic detection, timestamp, screen occlusion, dynamic adjustment The frame rate, etc., so that the early ASIC protocols react flat in compressed card products.
With the specifications of video surveillance products, the ASIC program has gradually revealed the advantages in cost and stability, and the rich microelectronics complies with the trend of security markets, and the FH8735 chip is launched in time to the audio and video compression card market. FH8735 supports the real-time encoding of the two 720p30 HD or 8-way D1 or 16 channels, which greatly improves the integration of the compression card, reducing costs, and further reducing the threshold for the development of the hard pressure card.
FH8735 H.264 Compressed Chip Introduction
FH8735 is a high-performance H.264 compressed chip that supports H.264 Main Profile and Baseline Profile video compression formats, you can perform real-time compression coding and multi-channel audio encoding of eight-way standards or 2720p HDs. While encoding, complete the audio and video synchronization, output ES / PES / PS / TS.
In addition to high-performance video coding capabilities, FH8735 provides a wealth of video pretreatment features such as DE-Interlace, DE-Noise, OSD superposition, scaling, and mobile detection, etc.
The video input interface of the FH8735 can receive 8 standard BT.656 at the same time. You can also configure the video input interface as a 2 high-definition video input interface as needed. FH8735 can receive digital video from the CMOS / CCD module, video decoder, LVDS receiver, and HDMI receiver. In addition, the FH8735 can directly receive the enhanced 656 video of the TW2815 / TW2816 output.
FH8735 can receive eight stereo audio input at the same time. It can also be configured as a 16-channel audio input according to the application needs.
To configure external video and audio receiving chips, FH8735 provides two fully independent standard I2C interfaces to deal with conflicts of external devices I2C address possible.
The typical application of FH8735 includes a video conferencing system, security monitoring, and the like require high resolution or multi-channel video encoding.
The system block diagram of FH8735 is shown below:
Compared with other similar types of chips, the main technical advantages of FH8735 are as follows:
1) Super compression coding performance
The H.264 encoding of FH8735 is completed by pure hardware, with high coding capabilities, high coding quality, low power consumption. FH8735 supports dual streams, coding capacity can support 8D1 + 8CIF real-time encoding:
200fps d1 + 200 fpscif @PAL
240FPS D1 + 240FPSCIF @ntsc
By the contrast result of the typical video encoding, the FH8735 approaches the video coding quality of JM11.0 at the same rate of code.
2) Video processing functions for video surveillance
In order to meet the special functional requirements of digital video surveillance, FH8735 provides flexible video coding options and dedicated digital video processing. The coding parameters such as resolution, code stream, frame structure can be modified while encoding. The keyframe output can be forced during the compression process, change the frame rate, quantization coefficient, resolution, code stream, and frame structure without stopping, start compression coding. In addition, the FH8735 supports the input video to perform a variety of image processing functions such as the input video, the image screen, the reduction of image screen, and movement detection, and also supports the abnormal raw video signal for the host. Some intelligent analysis and processing such as license plate identification, face recognition, etc.
There are two sets of independent DDR controllers inside the FH8735, which can be connected to the external DDR SDRAM. Configure a group or two sets of external DDR SDRAM depending on the actual system's demand for encoder performance.
3) Patent Code Rate Control Technology
FH8735 provides four code rate control strategies: fixed quantization coefficient (QP: Quantisation parameter), constant bit rate (CBR: constant bit rat), VBR: Variable Bit Rate, Peaceful Bit Rate (Abr: Average Bit Rate). Each algorithm has been carefully optimized, can adapt to the video scene to perform pre-detection and judgment, so that while ensuring the subjective quality of the video, the code rate and stability of the encoder output will ensure the efficiency and stability of network transmission. In particular, the ABR algorithm has obtained a national patent certification due to its innovation and practicality of its algorithm.
FH8735-based audio and video compression card scheme
In order to speed up the customer's pre-assessment and development needs, Fu Hao provides the FH8735-based 8-way D1, 16-channel CIF all-time and 16-way D1 non-real-time audio and video compression card reference design.
The compressed card supports up to 16 audio and 16-channel video input, which can complete the acquisition of audio and video, H.264 encoding, and send it to the host through the PCI interface.
System schematic of system based on FH8735 audio and video compression card reference design is as follows:
Figure 1: System schematic of audio and video compression card.
FH8735 audio and video compression card real objects are shown below:
Figure 3: FH8735 audio and video compression card.
Flexible, referring to the reference design, including FH8735, FRMWARE, supports Windows XP / WIN 7 and Linux drivers, Windows / Linux SDK, and demo, and can modify the firmware based on user specific applications.
Windows / Linux SDK implements the front video input type configuration of FH8735, encoding parameter setting, OSD text superposition, OSD graphics superimposed, mobile detection, area shielding, and preview YUV data.
Compared to mainstream DSP programs and ASIC schemes, the main features and advantages of the program are as follows:
1) cost-effective
FH8735 single-chip can complete 8 roads D1, 16 channels of CIF all-on-a-time and 16-way D1 non-real-time boards, compared to other DSP and ASIC programs, with significant cost performance advantages.
2) Solution development cycle
The software and hardware design of the program is simple, software is completely completed by hardware, and has stable drive and SDK, and customers complete customized applications based on drivers and SDK. Therefore, it is possible to shorten the development cycle and quickly push into the market.
Summary
FH8735 has a single-chip 8-channel full D1 H.264 real-time coding capability, and provides video processing functions for video surveillance, which can significantly improve customer product performance, and reduce development time, and is currently the most competitive new generation of the market. High cost performance audio hard compression board program. The FH8735 H.264 compression board program will further spread and expand the hard compression card market. Technology area
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