SHD4 H264 low-latency decoding and playback board

• COFDM无线接收视频流输入，H.264解码，HDMI、OF、USB/Ethernet同时输出视频流
• Low-latency H.264 audio and video decoding HD playback board，Maximum support for 1080P@60 real-time decoding
• Ethernet输入视频流，H.264解码HDMI与AV输出
• 可存储接收到的视频流，录制文件带时间信息(具备RTC功能)
• 小尺寸80.4 * 50.8 mm，方便用户集成

Function description：

• SHD4板实现H.264视频解压缩播放功能，Maximum support for 1080P@60fps decoding and playback，Backwards compatible with various other resolutions、Frame rate decoding and playback。SHD4解码板配合 H264编码板(For example SUE1)Used with COFDM transmitting and receiving modules to achieve low-latency high-definition digital wireless image transmission function，When actually testing 720P@60, the video delay can reach about 60ms.，1080Video delay can be about 130ms at P@60。The delay refers to the delay from the HDMI video input of the transmitter to the HDMI video output of the receiver.，Does not include the delay of the transmitter front-end camera(We actually measured the delay of a certain brand of SLR camera to be around 70ms.、The delay of a well-known brand action camera is about 130ms)；
• Support AES decryption function(Encryption matching with transmitter，可通过配参面板设置password)；
• Audio and video output interface：
  • HDMI-A type port audio and video output(HDMI out)
  • AV音视频输出(6PIN端口)
  • USB Host接口输出到手机或平板
  • 以太网口输出
• USB Host接口：
  • External U disk/mobile hard disk storage
  • Stream video to mobile phone/tablet，Simultaneously realize HDMI video display and mobile phone video display
• Parameter configuration serial port(Config UART)：Can be connected to PC or parameter control panel for parameter configuration，It can also be connected to other host computers for parameter configuration.(For example, drone remote control)。Config UART为TTL 3.3v电平；
• Transparent data transmission serial port(Data UART)，TTL 3.3V电平；
• TF card interface(For software upgrade and maintenance、视频存储等)；
• DR2C dual-antenna COFDM receiving module docking interface；
• Keys+LEDs：可引出为电源指示灯、RF signal receiving indicator light、Recording indicator light、OSD开/关按键、Record开/关按键；
• Ethernet以太网口：视频输入或输出接口；
• Power in接口：支持9~30V的电源输入；
• 尺寸80.4 x 50.8 mm(Excluding the dimensions of interface components and connectors protruding from the edge of the board)。

SHD4解码板应用：

1)SHD4板装配DR2C双天线COFDM接收解调模块，形成完整的COFDM接收解码功能。：

2)SHD4板的Config UART接口可外接串口控制面板，Set operating parameters，Such as working frequency band、Configurable convolutional coding ratio、接收密码、系统时间等的设置。下图是串口控制面板SconA通过4PIN连接线连接到SHD4板示意图，由SHD4板对其供电。

3)SHD4解码板也可通过网口输入H.264视频流进行解码播放输出，软件可根据用户需要烧写相应版本固件。

4)SHD4板可通过网口将DR2C接收到的COFDM无线视频流传输到PC或者NVR设备，decode and play。
5)SHD4板可通过Data UART接口接收OSD叠加数据(满足“OSD叠加协议”)，并将接收到的OSD叠加数据以文字方式叠加显示到视频画面上。