The A/V outputs allow live video, recorded A/V or JPEG snapshots to be displayed on an external monitor. Date and time are maintained by a real-time clock with battery backup.
The board encodes standard NTSC/PAL composite video using efficient H.264 compression. Audio from the onboard microphone is digitized and compressed using AAC encoding. The compressed A/V streams are multiplexed and recorded as MP4 files, with file names automatically generated by the real-time clock. Bit rates and image resolution, frame rate and GOP size can be tailored to match application requirements and storage capacity.
Three independent overlay generators can position up to 160 text characters anywhere in the video frame. A unique text string can be defined for each overlay, which automatically updates every frame. Supported variables include time, date, and frame count. The DVR interface supports a user-supplied keypad working in conjunction with the board's flexible on-screen menu system. Each keypad connector pin can be routed directly to a keypad switch and configured to match the control scheme of a custom keypad.
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