gistfile1.txt

import subprocess
import numpy



x=subprocess.Popen(["ffmpeg","-re","-f","rawvideo","-s","250x250","-pix_fmt","rgb24","-i","-",
                    "-vcodec", "libx264",
                    "-acodec", "aac", "-b:a", "192k",
                    "-f", "flv",
                    "rtmp://live-push.bilivideo.com/live-bvc/?streamname=************"],stdin=subprocess.PIPE,stderr=subprocess.PIPE)

data=numpy.ndarray([250,250,3],"u1")
data[:][:]=[255,0,0]
data[100:150,0:200]=[0,56,0]
while 1:
    x.stdin.write(data)