[Python] Piping pi's opencv video to ffmpeg for Youtube streaming

This is a small python3 script reading off picam using OpenCV :

#picamStream.py

import sys, os
from picamera.array import PiRGBArray
from picamera import PiCamera
import time
import cv2

# initialize the camera and grab a reference to the raw camera capture
camera = PiCamera()
camera.resolution = (960, 540)
camera.framerate = 30
rawCapture = PiRGBArray(camera, size=(960, 540))

# allow the camera to warmup
time.sleep(0.1)

# capture frames from the camera
for frame in camera.capture_continuous(rawCapture, format="bgr", use_video_port=True):

image = frame.array

# ---------------------------------
# .
# Opencv image processing goes here
# .
# ---------------------------------

os.write(1, image.tostring())

# clear the stream in preparation for the next frame
rawCapture.truncate(0)

# end


And I am trying to pipe it to ffmpeg to Youtube stream

My understanding is that I need to reference below two commands to somehow come up with a new ffmpeg command.

Piping picam live video to ffmpeg for Youtube streaming.

raspivid -o - -t 0 -vf -hf -w 960 -h 540 -fps 25 -b 1000000 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv rtmp://a.rtmp.youtube.com/live2/[STREAMKEY]


Piping OPENCV raw video to ffmpeg for mp4 file.

python3 picamStream.py | ffmpeg -f rawvideo -pixel_format bgr24 -video_size 960x540 -framerate 30 -i - foo.mp4
​

So far I've had no luck. Can anyone help me with this?

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