Media Transmission

Definition

The device works with cameras to detect the network bandwidth. Based on this information, the cameras dynamically adjust the bit rate to ensure smooth video.

Customer Benefits

When the network bandwidth is unstable, this feature balances the bandwidth pressure and video effect to meet the core requirements of users.

Application Scenario

If a user has high requirements on video smoothness but the network bandwidth is unstable, cameras automatically degrade the image quality to ensure smooth video playing.

Requirements

Application Limitations

• This feature is supported only when cameras are connected to the device but not in scenarios where cameras are directly connected to the client.

Context

With the adaptive bandwidth function enabled, the camera will use an appropriate bit rate that best suits the current network conditions to transfer video images. This approach ensures the image quality.

This function is valid only when the following conditions are met:

• The stream type is primary stream.
• The encoding protocol is set to H.264 or H.265.
• The bit rate type is set to Constant bit rate.
• The variable bit rate is disabled.

Scenario Description

Procedure

1. Enable the adaptive bandwidth function on the camera.
   1. Log in to the camera web system as the admin user. ( Logging in to the Camera Web System)
   2. Choose Settings > Network > Intelligent Acceleration > Adaptive Bandwidth.
   3. Enable adaptive bandwidth, as shown in Figure 4-69.
      Figure 4-69 Enabling adaptive bandwidth
      

2. Set adaptive bandwidth parameters on the HWT-IVS1800 side.
   1. Log in to the LDU as the admin user. ( Logging In to the LDU)
   2. Right-click on the desktop and choose Camera Management > Video > Video Encoding.
   3. Select the camera to be configured.
   4. Set Bit Rate Type to Variable bit rate and click Save, as shown in Figure 4-70.
      Figure 4-70 Setting the bit rate type to constant bit rate
      
   5. Click Apply to other to apply the current settings to other cameras in batches.
      Table 4-60 describes the parameters.

      Table 4-60 Parameter description

      Parameter	Description
      Stream Type	Main Stream: primary stream Sub Stream 1: secondary stream 1 Click Main Stream.
      Encoding Protocol	H264 H265 MJPEG
      Constant bit rate	Constant bit rate indicates that the rate at which a codec's output data should be consumed is stable. If the bit rate is incorrectly configured for images with fast encoding and compression speed but great dynamic changes, the images will be unclear.
      Variable bit rate	The bit rate varies depending on the image complexity to ensure that large dynamic images are clear. However, the compression speed is low. The bit rate is low if the image is simple or static.

Verification Scenario

• Verify that a camera is in a good network environment.

  Click on the Live tab page and view the current video bit rate. The bit rate is high.

• Verify that a camera is in an abnormal network environment (the network speed decreases).

  Click on the Live tab page and view the current video bit rate. The bit rate is low.

Definition

FEC-enabled media transmission is supported, ensuring that the video is played smoothly even with up to 5% packet loss. The forward error correction (FEC) parameters are configurable.

Customer Benefits

When packet loss occurs on the network, this feature balances the bandwidth pressure and video effect to meet the core requirements of users.

Application Scenario

If a user has high requirements on video smoothness but packet loss occurs on the network, cameras automatically degrade the image quality to ensure smooth video playing.

Requirements

Application Limitations

• FEC and media security cannot be enabled at the same time.
• This feature is supported only when cameras are connected to the HWT-IVS1800 but not in scenarios where cameras are directly connected to the client.
• This feature takes effect only when UDP is used for transmission.

Scenario Description

Procedure

1. Log in to the LDU as the admin user. ( Logging In to the LDU)
2. Click in the upper left corner to access the main menu.
3. Choose Camera Management.
4. Select a specified camera and click next to the camera.
5. Set FEC parameters, as shown in Figure 4-71.
   Figure 4-71 Setting FEC parameters
   

   Table 4-62 describes the parameters.

   Table 4-62 Parameter description

   Parameter	Setting
   Reliable Transmission	Select FEC.
   Packet Loss Concealment	Select a packet loss concealment rate based on the site requirements. The value ranges from 1% to 5%. In this example, the value is 5%.