I have a usb camera '/dev/videoX' and I've implemented decoding process. 
Supported camera framerates are 15 and 30.
However, I need to reduce its framerate in order to stream video data 
(RTP/RTSP) from multiple usb cameras (I have 4 cameras) using H.264 codec and 
keep quality as good as possible.
Also it is essential to be in real-time (small delays). I've been searching on 
how to reduce the framerate of the output stream, for example to 5 fps.
And I know that in order to reduce the framerate in CLI (ffmpeg)  '-r' flag is 
used.

And my question is how '-r' functionality is implemented?
Is it filter (AVFilter) or some kind of algorithm?

Thanks.

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