This also can decrease the network bandwidth burden, which in turn to achieve smooth video monitoring in low bandwidth situations. Furthermore, sub-stream may not transmit real time video, but transmit key frames and sub-frames to deliver video. The majority video surveillance products can automatically choose appropriate sub-stream resolution to match your smartphone's display resolution. Sub-stream: offering low/standard definition video primarily for lower bandwidth situations, the sub-stream resolution are QCIF, CIF, 2CIF, DCIF, 4CIF (D1). Additionally, main-stream delivers real-time (30fps or even high frame rate 60fps) HD video stream, this can ensure local recording footage offers detailed information without missing anything important. Main-stream: stream resolution is higher than sub-stream, for local video streaming, output high definition video to display on the local monitor, also record HD video on your local network network video recorder (NVR). Dual-stream technology enabled video surveillance products deliver high definition video for local video storage, meanwhile overcomes 3G/ADSL network bandwidth limitation to deliver smooth low/standard definition video. This technology also called Dual-stream technology, it adopts one channel main-stream to deliver high definition video for local HD video recording/storage, such as 5 megapixel, 3 megapixel, 2 megapixel (1080p), 1.3 megapixel (720p), meanwhile one channel sub-stream to deliver low or standard definition video over Internet for remotely surveillance (e.g. Now it is widely used in DVR, NVR, IP camera across different manufacturers. This technology has been used in Hikvision DVR to offer smooth video streaming for remote monitoring. Main-stream and sub-stream concept was first developed by Hikvision.
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