Symptom

Possible Cause

• The IVS platform does not receive media streams sent by the camera.
• The size of RTP packets sent by the camera exceeds the size of the buffer where the IVS platform receives RTP packets.
• The IP address or port number of media streams sent by the camera to the IVS platform is different from that specified during signaling interaction.

 NOTE:

The size of the buffer where the IVS platform receives RTP packets is 1500 bytes. If the size of RTP packets sent to the IVS platform exceeds 1500 bytes, the RTP packets will be truncated, which results in data loss.

• If the lost data is media key frames, a blank screen occurs on the live video images.
• If the lost data is non-media key frames, artifacts occur on the live video images.

Solution

1. Check whether the IVS platform receives media streams sent by the camera.
   1. Log in to the OMU portal of the server and enable the debug log function for the DCG.
   2. Use Wireshark to capture communication packets between the server and the camera whose IP address is the value of deviceIP are captured.
   3. Log in to the IVS C/S client, enable live video from the camera. About 2 minutes later, stop capturing packets.
   4. Use Wireshark to open the packet file and check whether the RTP packet exists in the captured packets.
       NOTE:

      The packet with the field Inter leaved channel is the RTP packet, as shown in Figure 1.
      Figure 1 RTP packet sent by the camera to the IVS platform 
      
      • If no, contact Huawei technical support engineers.
      • If yes, go to the next step.

2. Check whether the captured RTP packet exceeds 1500bytes.
    NOTE:

   RTSP Interleaved Frame, Channel:0x00, 8000 bytes in Figure 1 indicates that the size of the RTP packet is 8000 bytes.
   • If yes, contact the device vendor to change the RTP packet size and check whether the fault is rectified.

     If the fault is rectified, no further action is required. If the fault persists, go to 3.

   • If no, go to the next step.

3. Check whether the IP address or port number of media streams sent by the camera to the IVS platform is the same as that specified during signaling interaction.
   1. Go the directory where DCG logs are stored, /home/ivs_dcg/log/debug.
   2. Use the SFTP tool to download all debug logs generated during packet capturing to the local computer.
   3. Check whether Video business not same exists in the logs.
       NOTE:

      If Video business not same exists in the logs, the IP address or port number of media streams sent by the camera to the IVS platform is different from that specified during signaling interaction. Then, the IVS platform discards the media streams, which results in a blank screen.
      • If no, contact Huawei technical support engineers.
      • If yes, go to the next step.

   4. Check whether the Network Address Translation (NAT) function is enabled when the camera and switch are connected to the network.
      • If no, contact Huawei technical support engineers.
      • If yes, disable the NAT function and go to the next step.

4. Check whether the fault is rectified.

   If the fault is rectified, no further action is required. If the fault persists, contact Huawei technical support engineers.