1 Foreword Video Monitoring Products After the simulation era, the digital era, the development of the Internet, has now gradually entered the HD era. HD video and traditional standard definition video have a qualitative leap in video quality. For many factors such as chip coding capacity, network bandwidth, and storage technology, HD video has not been widely used, but with the rapid development of video coding, IC design, broadband network, and mass storage and other technologies, HD video applications The main obstacles have been cleared. The H.264 / AVC video coding criteria can greatly reduce the network bandwidth and storage capacity requirements of HD video transmission, and become a inevitable choice for HD video encoding. Currently, HD video surveillance has been concerned and apps more and more industries. The universal characteristics of these industry users are a video image that requires higher definition. Shanghai Fuyi Microelectronics Co., Ltd. launched the FH8735 H.264 encoded expertise integrated circuit and the corresponding solution in September 2008. It has a single-chip 1-way 1080p @ 30fps or two-way 720p @ 30fps's HD video real-time coding capability, is the most competitive high-performance video coding chip on the market, which can greatly meet the development needs of HD video. FH8735 chip has launched a series of HD video product solutions based on FH8735 chips, such as HD network camera solutions, HD network video server solutions, and PCI HD video compression cards. After more than a year of market inspection, FH8735 has been widely used in video security monitoring, video conferencing, distance education, telemedicine, high-definition screen recording, and personal consumer electronics. 2 FH8735 HD Coding Chip Introduction FH8735 is a high-performance audio and video encoding chip, supporting H.264 Main Profile and Baseline Profile video coding standards, can be implemented and controlled to high-definition signals of all the way 1080i, 2 720p. While encoding video data, the related multi-channel audio data is also encoded, and the audio and video synchronization is completed, and the ES / PES / PS / TS and other format compression code streams are output. Each internal function module of FH8735 is shown in Figure 1. The main technical features of FH8735 are as follows: 1) Super coding performance FH8735 H.264 encoding is completed by pure hardware, high coding capabilities, high coding quality, and low power consumption. FH8735 supports maximum video input of the maximum resolution 2048x1024, supports 1 road 1920x1080 @ 30fps or 2-way 1280x720 (1280x720 @ 60fps) real-time encoding. The contrast results of typical video coding indicate that the FH8735 is close to JM12.0 video coding quality at the same rate. 2) The rich peripheral interface FH8735 supports a variety of HD video input modes, high-definition video data format and synchronous mode can be configured, can receive digital video from CMOS / CCD module, video decoder, etc. Support ITU-R BT.709 / SMPTE 274M (24bit 4: 4: 4 YCBCR, 16bit 4: 2: 2 YCBCR, RGB 24 (8: 8: 8)); support SMPTE296M-2001 (24bit 4: 4: 4 YCBCR, 16bit 4: 2: 2 YCBCR, RGB 24 (8: 8: 8)) Support 8bit 4: 2: 2 ycbcr; support within synchronous and external synchronization; additional, FH8735 also has SPI / PCI / SD / UART / I2S / GPIO / I2C / Mac and other peripheral interfaces. 3) Patent Code Rate Control Technology FH8735 provides four yaw 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, 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. 4) Flexible Function Settings In addition to high performance video coding capabilities, FH8735 provides a rich video pre-processing and flexible video encoding options. The encoder's search range, Intra prediction type, GOP length, reference frame number, coding rate and code rate control method, encoding profile and level, etc., which can be flexible as needed, so that the decoding of different decoding capabilities can be guaranteed. A seamless docking. 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. For example, when encoding a 720p video, just configure a set of DDRs to reduce the system BOM cost. 5) Optimized Design Ultra-low Delay Real-Time Coding Technology In HD video systems, the system delay is also an important consideration point. FH8735 reduces internal delays in the entire video encoding by supporting flexible image fragmentation coding. If a high-definition video encoded 720P format, the time per frame data input system buffer is about 16.7 ms. The time from the first valid row data from the image begins the input system buffer start timing to the encoder output the entire frame compression code stream can be controlled within 20 ms. This ultra-low-delay real-time coding technology can greatly reduce the end-to-end delay of the entire system, thereby improving and improving user subjective experience. 2 Multi-channel HD video codes based on FH8735 to meet the pre-evaluation and development needs of FH8735 in high-definition encoding applications, FREFREFF provides a multi-channel high-definition video encoding card reference design based on FH8735. This HD encoding card supports HD video input and PCI host interfaces for DVI / HDMI and YPBPR interfaces, which can be collected, encoded, encoded, and sent to the host through the PCI interface. This reference design supports Windows XP and Linux, Flexible Providing the corresponding drivers and evaluation software, and can modify the firmware according to user specific applications. The system diagram of the multi-channel HD video encoding card is as follows: 3 Conclusion FH8735 has a single-chip 1 road 1920x1080 @ 30fps HD video real-time coding capability, is the most competitive new generation of high-performance video coding chips on the market. The high performance and ease of use of FH8735 provide new options and spaces for HD or multi-channel video compression applications, which can significantly improve customer product performance and reduce development time. , Reading the full text, the technology area
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