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To set up the tampering detection, do the following:

  1. If a camera supports multistreamingmulti-streaming, select the stream for which detection is needed (1). Selecting a low-quality video stream allows reducing the load on the Server.
  2. Select one or more analyzes to be applied to the video image (2).
  3. Set the frame rate value for the detection tool to process (3). This value should be in the range [0.016, 100].

  4. The default setting for all analyzes is Decode only key frames (4). In this case, the only key frames are processed every 500 milliseconds or less oftendecoded. To disable the decoding of key frames, select No in the appropriate corresponding field.

    This setting applies to all codecs. If a codec has keyframes and p-frames, the keyframe is decoded no more often than every 500 miliseconds. For the MJPEG codec, each frame is considered to be I-frame.
    Note
    titleImportant
    Attention!

    This feature reduces the Server load but, as can be expected, negatively impacts the quality of detection.

    This setting should be activated on "blind" Servers (Servers that do not display video) on which it is necessary to perform detection.

    For the MJPEG codec, each frame is considered a key frame.


    Note
    titleImportantAttention!

    Period and Decode key frames parameters are correlated.

    If no local Clients are connected to a Server, the following rules are set for remote Clients:

    • If the interval between consecutive I-frames exceeds the value specified in the Period field, the detection tool will process I-frames.
    • If the I-frame frequency is lower than the value specified in the Period field, the detection tool will use the set value.

    If at least one local Client connects to the Server, the detection tool is forced to use the set value. After the local Client disconnects, the indicated rules become valid again.


  5. Select a processing resource for decoding video streams (5). When you select a GPU, a stand-alone graphics card takes priority (when decoding with Nvidia NVIDIA NVDEC chips). If there's no appropriate GPU, the decoding will use the Intel Quick Sync Video technology. Otherwise, CPU resources will be used for decoding.

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