[KBA-00546] Camera streams freeze or pixelate over a wireless or unreliable network in Omnicast™ - Omnicast™ 4.4 - 4.8

series
Omnicast™ 4.4 - 4.8
revised_modified
2012-07-10

[KBA-00546] Camera streams freeze or pixelate over a wireless or unreliable network in Omnicast™

This article explains why video streams might freeze or pixelate when viewed over a wireless or unreliable network in Omnicast™.

Summary

Cameras connected to an Archiver over a wireless or unreliable network do not display videos in great quality. When configured in Unicast UDP or Best Available, the video might be pixelated and the camera might go offline for a few minutes. When using Unicast TCP or RTSP stream over HTTP, the video stream might freeze for a few seconds when moving the PTZ.

More information

When streaming over a wireless or unreliable network, packets are not guaranteed to reach their destination. When using Unicast UDP or Best Available as a network connection type, there is no way of requesting these missing packets.

The best setup for this type of network is:
  • Use either Unicast TCP, RTSP stream over HTTP or RTSP stream over TCP (depending which is available), as these connection types force the retransmission of unreceived packets, effectively minimizing the video pixelation.
  • Adjust the video quality settings (video data format, bit rate, image quality factor) to optimize the bandwidth.

    In case the network is unreliable and many TCP retransmissions occur, the cameras will drop frames and the video will freeze. We strongly recommend that you reduce the key frame interval on the camera to 1 second or lower, which can minimize the freezing time. Depending on the camera model, you can specify the key frame interval in images instead of seconds. More key frames will require more bandwidth.

  • To minimize issues on a wireless network, users should limit the bitrate used on cameras.