Under VBR mode it is possible to adjust the GOP length - that is the
occurrence rate of I-frames. By default, there is one I-frame per second. For
example, in case of 30fps, there will be 1 I-frame and 29 P-frames every
second by default. When the GOP is changed to “1 I-frame per 5 seconds”,
then there will be one I-frame, followed by 149 P-frames. In case of the
static scenes, long GOP can further minimize the bandwidth and storage
consumption.
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