Bosch MIC IP fusion 9000i Operation Manual page 26

26 en | Camera MIC IP fusion 9000i
Averaging period
Select the appropriate averaging period as a means of stabilizing the long term bit rate.
Target bit rate
To optimize use of the bandwidth in the network, limit the data rate for the device. The target
data rate should be set according to the desired picture quality for typical scenes with no
excessive motion.
For complex images or frequent changes of image content due to frequent movements, this
limit can temporarily be exceeded up to the value entered in the Maximum bit rate field.
Note: You can change the value in this field only if you select a duration in the field Averaging
period. If you do not select an Averaging period, then the field Target bit rate is greyed out.
Encoding interval
The Encoding interval slider determines the interval at which images are encoded and
transmitted. This can be particularly advantageous with low bandwidths. The image rate is
displayed next to the slider.
Video resolution
Select the desired resolution for the video image.
Note: The value in this field adjusts the resolution for SD streams only.
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).
I-frame distance
Use the slider to set the distance between I-frame to Auto or to between 3 and 255. An entry
of 3 means that every third image is an I-frame. The lower the number, the more I-frames are
generated.
Note that the values supported depend on the GOP structure setting. For example, only even
values are supported with IBP; if you have selected IBBP, only 3 or multiples of 3 are
supported.
Allow enhanced prediction
This function allows for multiple references in H.264 and H.265 streams, which can reduce
bitrate. Some decoders do not support this feature and therefore can be disabled.
Min. P-frame QP
This parameter allows you to adjust the image quality of the P-frame and to define the lower
limit for the quantization of the P-frames, and thus the maximum achievable quality of the P-
frames. 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 quantization of the P-
frame (QP value), the higher the encoding quality (and thus the best image quality) and the
lower the frame refresh rate depending on the settings for the maximum data rate under
network settings. A higher quantization value results in low image quality and lower network
load. Typical QP values are between 18 and 30.
The basic setting Auto automatically adjusts the quality to the settings for the P-frame video
quality.
I/P-frame delta QP
This parameter sets the ratio of the I-frame quantization (QP) to the P-frame quantization
(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. The basic setting Auto
automatically adjusts to the optimum combination of movement and image definition (focus).
2019-11 | 1.2 | Operation Manual Bosch Security Systems