main.py

import cv2
import subprocess as sp

rtsp_server = 'rtsp://65.2.75.34:8554/mystream'

cap = cv2.VideoCapture(0)
sizeStr = str(int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))) + 'x' + str(int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)))
fps = int(cap.get(cv2.CAP_PROP_FPS))

command = ['ffmpeg',
           '-re',
           '-s', sizeStr,
           '-r', str(fps),  # rtsp fps (from input server)
           '-i', '-',

           '-pix_fmt', 'yuv420p',
           '-r', '30',  # output fps
           '-g', '50',
           '-c:v', 'libx264',
           '-b:v', '2M',
           '-bufsize', '64M',
           '-maxrate', "4M",
           '-preset', 'veryfast',
           '-rtsp_transport', 'tcp',
           '-segment_times', '5',
           '-f', 'rtsp',
           rtsp_server]

process = sp.Popen(command, stdin=sp.PIPE)

while (cap.isOpened()):
	ret, frame = cap.read()
	ret2, frame2 = cv2.imencode('.png', frame)
	process.stdin.write(frame2.tobytes())