HD DVR Uniview XVR301-04G3

1 HDD 4-Ch 1U digital video recorder

• Supports H.265/H.264 video formats

• Supports audio via coaxial cable (only for TVI cameras)

• Control dual light of UNV analog cameras under TVI

• Supports TVI, AHD, CVI, CVBS, IP cameras with adaptive access

• 4/8/16-channel BNC input

• Supports 1-channel HDMI output, 1-channel VGA output up to 1920*1080

• HDMI and VGA simultaneous output

• Long transmission distance via coaxial cable

• Supports ONVIF and RTSP protocol main cameras

From ADSL to 4G, from resistive touchscreens to OLED, electronic products are demanding higher and higher definition. Starting from D1 resolution, video surveillance products have now reached 4K, which is 25 times higher. However, the pace of development has been slowed by the increasing demand for storage space and bandwidth that higher resolution video brings.

Take a 4K camera as an example, the common industry standard bitrate is 8Mbps for H.264. Therefore, 591GB of storage space is required for 24 hours of video surveillance over 7 days. It is much larger than the storage space of a personal computer hard drive. Meanwhile, the camera needs no less than 20Mbps of bandwidth to support both live view stream and stream storage. It is much higher than the global average wire speed and only slightly lower than South Korea, which has the highest wire speed in the world.

In order to balance the need for HD surveillance and the corresponding storage and bandwidth costs, and to keep up with the development from H.264 to H.265, Uniview has been making great efforts to exploit the HEVC coding standard and has invented the patented U-Code coding technique. The combination of U-Code and H.265 is a unique technology - Ultra 265. Ultra 265 is an end-to-end solution that can save up to 95% of storage space and 75% of storage costs, bringing great convenience to users. What should be concerned about is that U-Code has recently been updated to U-Code 2.0, which is more powerful and intelligent than before.

Ultra 265 – More than just deep compression technology

Unlike conventional video compression technologies that attempt to reduce storage costs by sacrificing resolution and frame rate, U-Code 2.0 chooses to use "IRP" (Intelligent Region Perception) to detect motion in each frame. Therefore, scenes containing interesting information could be preserved, while other relatively static areas such as lawns, white walls could be compressed to save storage space.

In order to reduce bandwidth, U-Code 2.0 applies dynamic GOP (Group Of Pictures) technique, which suggests that the time interval between critical I frames of GOP can be dynamically adjusted by analyzing the trend of picture diversity. In other words, as the surveillance image tends to be static, the GOP becomes longer, while it tends to move, the GOP becomes shorter. Meanwhile, it uses a VI (virtual I frame) to ensure that the media has a key frame that contains critical information so that the NVR can initiate Frame Accurate Search and Quick Playback.

Furthermore, U-Code 2.0 also supports frame rate control for different video content, we call it dynamic frame rate. It is used to automatically maintain high frame rate tracking for many moving objects, but reduces the number of frames for a few cases of moving objects. No more details will be missed for complex surveillance images, and no more storage space will be wasted for simple monitoring situations.

Additionally, U-code 2.0 can be applied to all streams, which means it can reduce bandwidth for multiple uses. By combining U-Code2.0 and H.265, Ultra 265 can compress up to 95% of bandwidth and storage space.