Four Characteristics of Video Server and Discussion of Common Problems

Network video server (DVS, digital video server), also known as digital video encoder, is a professional network transmission device for compressing and processing audio and video data. It consists of audio and video compression codec chip, input and output channels, network interface, and audio and video interface. , RS485 serial interface control, protocol interface control, system software management and other components, mainly to provide video compression or decompression functions, complete the collection or recovery of image data, the more popular image based on MPEG-4 or H.264 Data compression transfers data and audio data processing over the Internet.

Four characteristics of network video server

The network video server (the definition of the network video server) mainly includes three modules: image acquisition, image compression, and network transmission. The image acquisition module realizes the A/D conversion of the video signal; the image compression module realizes the compression coding of the digital signal by a certain compression coding standard; the network transmission module realizes the functions such as the transmission of the compressed data and the setting of the system function.

Simplicity Through the rapid development of a cost-effective computer communication network to transmit video data to the monitoring center, only a low-cost Category 5 network cable is required. If the video server has a WIFI module inside it and uses a wireless LAN, then Five types of network cables are all saved.

The small model is usually 1-4 channels of analog video input. It will not have more than ten channels of video input as hard disk recorders, and it will not randomly carry hard disks. Placing storage devices at the monitoring center is more conducive to the storage and protection of image data. This saves a lot of space.

Easy to upgrade and fully scalable It is easy to add more cameras, and the central server can easily be upgraded to faster processors, larger disk drives, and greater bandwidth in the future.

The powerful center controls an industrial standard server and a set of control management application software to run the entire security monitoring system. The user only needs to open a client program on a computer connected to the Internet and enter the corresponding IP address of the video server. It can perform full remote monitoring. Any authorized client can directly access any camera or access the monitored image through the central server.

Network Video Server Frequently Asked Questions

1. Can't access video server through browser?

Possible reasons: The network does not communicate?

Solution: Use a PC to access the network and test whether the network access can work normally. First remove the cable fault and the network failure caused by the PC virus until it can be pinged with the PC.

Possible reason: IP address is occupied by other devices?

Solution: Disconnect the video server from the network, connect the video server and the PC separately, and reconfigure the IP address according to the appropriate recommended operation.

Possible reasons: IP addresses are in different subnets?

Solution: Check the server's IP address, subnet mask address, and gateway settings.

Possible reason: Port is modified?

Workaround: Restore the factory default status by using the reset button on the back of the server.

2, PTZ or dome camera can not control?

Possible Causes: The PTZ protocol, baud rate, and address are different from those of the PTZ camera or dome camera used, baud rate, and address. (The old device baud rate setting method is different, the default PTZ address is 16 bits, if you need to change the protocol)

Solution: Enter the setup page and change the PTZ protocol, baud rate, and address to the used PTZ.

Possible causes: The signal cable is not connected or connected incorrectly?

Solution: Reconnect the control cable that connects the PTZ or dome camera to the server.

3. After the program is upgraded, the video cannot be browsed normally?

Solution: Close all browsing pages, find webrec in C:\Program Files\ and delete this folder.

4, the image is very card, pause, not smooth.

If you want to make the screen smoother, reduce the resolution and set the frame rate to 25 frames.

If the fixed stream is set, set the stream higher, or set it to a variable stream. Select the stream in the network transmission QOS in the network settings to give priority to the stream.

Network Reason: First ping the network camera to see if it is lost. If the packet is lost, check whether the network cable and network device are normal. Insufficient network bandwidth or congestion can also cause picture pauses.

5, the image has a mosaic, color blocks.

If you set the resolution and frame rate too high, set the allowable code stream is too low, or the network bandwidth is insufficient, will result in images have a mosaic phenomenon, if you want the picture to be smooth but allows the picture quality is lower, you can lower the resolution, Increase the frame rate and increase the bit rate. If the picture is clear, allow smoothness, increase the resolution, and reduce the frame rate.

6. When the image is previewed on the IE browser, the image color is wrong or white, and the black and white contrast is very different.

Reset the brightness, contrast, saturation, chroma, etc. of the image in the image settings options.

7. The sd card on the network video server has no video data or only previous data.

Check whether the SD card is readable and writable. Please dial the SD code to the writeable state. After receiving the network service server, whether the SD card has been recognized by the hard disk information set in the system is cleared in the disk management. The data is formatted, and finally selected to set the reading and writing, indicating that the SD card can be read and written. When the hard disk is full, the previous video data is deleted to store the new data. If you choose to stop, the hard disk will stop when it is full, and it is not recommended to stop. Set the system time of the network video server. The recording schedule is to determine whether to record the video. Set the recording time and video type in the video setting. , And select the local storage in the storage settings, indicating that the video data is stored on the SD card.

8, playback video data without sound.

Make sure the playback device on the computer side is normal. Check whether the audio settings in the system settings are checked. If yes, try voice intercom. If there is no voice, check whether the microphone of the network video server is normal.

9, an external alarm input, and allows the alarm output, but there has been an alarm output even if the front end did not trigger the alarm.

Select the appropriate alarm type in the alarm type of alarm setting. Select Normally open if the front alarm device is normally open.

10, there is no video data on the FTP server.

First, determine the server IP, user name, password, and port of the NAS settings set by the network video server network are correct, the FTP server service is running normally, the firewall does not prohibit ports 21 and 23, and video recording time is set in the video recording settings of the network video server. The storage setting type must also be selected to the network storage, and set a time in the NAS setting time period information to indicate what type of video data is allowed to upload during this time period.

11, audio effects are not good.

If it is a LINE input, adjust the input level so that it does not match the input level of the network video server and causes saturation distortion.

If it is a MIC input, check if the microphone is good and the shielding is good.

12. After the upgrade, accessing the webcam through the browser has an error.

Delete the browser's cache, open the internet option, click delete files in the internet temporary file, tick the option to delete all offline content, confirm and log in again.

13, can be registered in IE, click on the open camera after the preview interface no image appears, a black screen, but there is data transmission.

Find this folder on the C drive and delete this folder C:\Program Files\webrec\

Re-install the controls. If not, lower the resolution of the network video server.

14, no image after power, status indicator red.

If the device starts abnormally, press the RESET button for 10 seconds and restart it.

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