With the development of network camera technology and the popularity of broadband technology in recent years, network video servers have gradually become the mainstream product of current video surveillance equipment. More and more users are choosing network video servers as an important tool in security work. On the other hand, with the wide "landing" of multinational corporations, online videoconferencing is also faced with unprecedented opportunities for historical development. Therefore, online video servers are also being put on the surveillance of security video in the "enlarged environment". focus.
Network video server features
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 type 5 network cable is required. If there is a WIFI module inside the video server and the wireless LAN is adopted, then there are five types of network cables. Network cables are saved.
Small model
Generally, it is usually 1-4 channels of analog video input. It will not move more than ten channels of video input like 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. Save a lot of space.
Easy to upgrade and fully scalable
More cameras can be easily added, and the central server can easily be upgraded to faster processors, larger disk drives, and greater bandwidth in the future.
Powerful central control
An industrial standard server and a set of control management application software can run the entire security monitoring system. Users only need to open a client program on a computer connected to the Internet, and enter the IP address of the corresponding video server inside. Remote monitoring. Any authorized client can directly access any camera or access the monitored image through the central server.
Network video server FAQ summary
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.
Possible causes: Unknown 2, PTZ or dome camera cannot control?
Possible causes: PTZ protocol, baud rate, address, and the PTZ protocol of the PTZ or dome camera used.
Baud rate, address inconsistent? (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.
Network video server settings and playback 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.
Network video server features
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 type 5 network cable is required. If there is a WIFI module inside the video server and the wireless LAN is adopted, then there are five types of network cables. Network cables are saved.
Small model
Generally, it is usually 1-4 channels of analog video input. It will not move more than ten channels of video input like 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. Save a lot of space.
Easy to upgrade and fully scalable
More cameras can be easily added, and the central server can easily be upgraded to faster processors, larger disk drives, and greater bandwidth in the future.
Powerful central control
An industrial standard server and a set of control management application software can run the entire security monitoring system. Users only need to open a client program on a computer connected to the Internet, and enter the IP address of the corresponding video server inside. Remote monitoring. Any authorized client can directly access any camera or access the monitored image through the central server.
Network video server FAQ summary
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.
Possible causes: Unknown 2, PTZ or dome camera cannot control?
Possible causes: PTZ protocol, baud rate, address, and the PTZ protocol of the PTZ or dome camera used.
Baud rate, address inconsistent? (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.
Network video server settings and playback 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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