46 en Encoder Settings | Camera Browser Interface |
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9.1.8Expert Settings
if necessary, use the expert settings to adapt the I-frame quality and the P-frame quality to specific requirements. The setting is based on the H.264 quantization parameter (QP).
GOP structure
Select the structure you require for the Group of Pictures (GOP). Depending on whether you place greater priority on having the lowest possible delay (IP frames only) or using as little bandwidth possible, you choose IP, IBP or IBBP.
Averaging period
Select the appropriate averaging period as a means of stabilizing the long term bit rate.
I-frame distance
Use the slider to set the distance between I-frames to Auto or to between 3 and 60. An entry of 3 means that every third image is an I-frame.The lower the number, the more I-frames are generated.
Min. P-frame QP
In the H.264-protocol, the Quantization Parameter (QP) specifies the degree of compression and thus the image quality for every frame. The lower the QP value, the higher the encoding quality. A higher quality produces a higher data load. Typical QP values are between 18 and 30. Define the lower limit for the quantization of the P-frames here, and thus the maximum achievable quality of the P-frames.
I/P-frame delta QP
This parameter sets the ratio of the I-frame QP to the P-frame QP. For example, you can set a lower value for I-frames by moving the slide control to a negative value. Thus, the quality of the I-frames relative to the P-frames is improved. The total data load will increase, but only by the portion of I-frames.
AM18-Q0611 v5.50 2012.03 | Software manual | Bosch Security Systems |