1 Introduction
With the standardization of video surveillance products, ASIC solutions have gradually shown advantages in terms of cost and stability, and the FH8735 chip was launched in time for the audio and video compression card market. FH8735 can support two 720P30 HD or 8 D1 or 16 CIF real-time encoding, which greatly improves the integration of compression cards, reduces costs, and further reduces the development threshold of hard pressure cards.
2 Introduction to FH8735 H.264 compression chip
FH8735 is a high-performance H.264 compression chip, supports H.264 Main PROFILE and Baseline PROFILE video compression formats, can perform eight-channel standard definition or two-channel 720p HD real-time compression encoding and multi-channel audio encoding. While encoding, complete audio and video synchronization, output ES / PES / PS / TS.
In addition to high-performance video encoding capabilities, FH8735 provides a wealth of video pre-processing functions, such as de-interlace, de-noise, OSD overlay, zoom, motion detection, etc.
The video input interface of FH8735 can receive 8 standard BT.656 at the same time. You can also configure the video input interface as a 2-channel high-definition video input interface as needed. FH8735 can receive digital video output from CMOS / CCD module, video decoder, LVDS receiver and HDMI receiver. In addition, FH8735 can directly receive the enhanced 656 video output from TW2815 / TW2816.
FH8735 can simultaneously receive eight stereo audio inputs. It can also be configured as 16 mono audio inputs according to the needs of the application.
In order to configure external video and audio receiving chips, FH8735 provides two completely independent standard I2C interfaces to cope with possible conflicts of I2C addresses of external devices.
Typical applications of FH8735 include video conferencing systems, security monitoring and other fields that require high resolution or multi-channel video encoding.
The system block diagram of FH8735 is shown in the figure below:
Figure 1 FH8735 system block diagram
Compared with other chips of the same type, 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, which has the characteristics of high encoding ability, high encoding quality and low power consumption. FH8735 supports dual stream, the encoding ability can support 8D1 + 8CIF real-time encoding:
200fps D1 + 200fpsCIF @PAL
240fps D1 + 240fpsCIF @NTSC
The comparison results of typical video encoding show that under the same bit rate, FH8735 is close to the video encoding quality of JM11.0.
2) Video processing function for video surveillance
In order to meet the special functional requirements of digital video surveillance, FH8735 provides flexible video encoding options and specialized digital video processing functions. You can modify encoding parameters such as resolution, code stream, and frame structure while encoding. During the compression process, you can force the output of key frames, change the frame rate, quantization coefficients, resolution, code stream, and frame structure without stopping and starting compression encoding. In addition, FH8735 supports various image processing functions such as de-interlacing, de-noising, multiple text and graphics OSD superimposition, image screen reduction, motion detection, and other input processing of the input video. It also supports capturing the original video signal without loss for the host to perform Some intelligent analysis and processing such as license plate recognition, face recognition, etc.
There are two sets of independent DDR controllers inside FH8735, which can be connected to two sets of external DDR SDRAM. Configure one or two sets of external DDR SDRAM according to the actual system requirements for encoder performance.
3) Patented code rate control technology
FH8735 provides four kinds of code rate control strategies: fixed quantization coefficient (QP: quanTIsaTIon parameter), constant bit rate (CBR: Constant Bit Rate), variable bit rate (VBR: Variable Bit Rate) and average bit rate (ABR: Average Bit Rate). Each algorithm has been carefully optimized to adaptively detect and judge the video scene in advance, so as to ensure the subjective quality of the video, and at the same time make the encoder output rate smooth and stable, to ensure the efficiency and stability of network transmission. Especially the ABR algorithm, because of its innovativeness and practicality, has obtained a national patent certification.
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