Adjust FPS and GOP parameters
Adjust FPS and GOP parameters

GOP indicates the interval frames of I-frames which have larger sizes
than P-frames have. And therefore the larger GOP setting comes with less
bandwidth overhead. For instance, GOP=60 and FPS=15 means every 4 seconds
comes with an I-frame which is better for pictures with less movements.

Signed-off-by: Leo Ma <a53a317c6ef26cd024d51182ec568f98d2cd3f6e@gmail.com>

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