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46 en | Encoder Settings Camera Browser Interface
AM18-Q0611 | v5.50 | 2012.03 Software manual Bosch Security Systems
9.1.8 Expert 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.