How to change framerate in REALTIME when video is PLAYING?

[Tom]

Hi,

I use
gst-launch filesrc "location=video/1.MPG" ! decodebin ! videorate !
video/x-raw-yuv, width=640,height=480,framerate=25/1 ! ffmpegcolorspace !
jpegenc ! multipartmux ! tcpserversink host=192.168.2.1 port=$portNumber
to stream a video and can change the video frame rate in this way.
But in this way the frame rate is fixed (i.e., framerate=25/1 here).

I want to change the framerate in REALTIME when video is PLAYING  ---
during the streaming of this video, I can change the framerate anytime I
want.

Someone has replied that I can use Python to get dynamically changing.
 But I am a new user of Gstreamer and my project is due next week :(
I searched those python examples but did not get information that I can use
for my problem :(

Anyone can give me a simple example of this kind of Python script?
Thanks you in advance!

Tom
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