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H.264 Network Video Streaming Server
NVS-25
I
B
B
P
B B
P
The GOP structure is often referred by the GOP size, which is defined as a distance
between
two
full
images.
For
example,
in
a
sequence
with
pattern
IBBPBBPBBPBBIBBPB..., the GOP size is equal to 12 (length between two I frames).
The NVS-25 offers the user three types of GOP structure: IBBP, IPPP and IBP. Note:
Since B-frame is predicted based on I and P frames, a GOP cannot end with a B-frame
because if B-frame is used as a reference for making further prediction, a growing
propagation error will result.
GOP pattern with longer GOP length encodes video very efficiently. Shorter GOP
lengths usually work better with video that has quick movements, but they do not
compress the data rate as much. On the NVS-25, there are 57 GOP sizes available for
the user, ranging from 6 to 62.
25
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