PiXORD PD637, User Manual

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PD637 User’s Manual
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required recording storage estimation, VBR is by way of compensation that adjustable bit rate fits the actual image
activity.
Image Format -
H.264 and MJPEG are available for image format
selection. The term, “image format”, is referring to compression /
encoding technique. The selection of image format decides the performance of bandwidth and storage requirement.
In the request of same video quality, H.264 contributes to less bandwidth and storage requirement, which is more
efficient than MJPEG.
GOP -
In H.264 video coding, GOP (group of pictures) describes how the different types of frames are arranged. The frame
types implemented here are I -frame (full image information) and P -frame (motion-compensated difference
information). This setting configures the GOP length which is the number of frames before next I-frame appears.
Having more I-frames usually increases the stream size, and therefore more bandwidth and storage are required.
Frame Rates -
The Frame Rates defines the number of frames that will be displayed per second. The frame rate setting can affect
the target bit rate (bandwidth requirement) and storage requirement.
Note:
While multiple streaming is possible, each stream has its limitation and dependency to other stream.