How to pass video stream from one python to another?

In my previous post, we found a way to pass an image file from one python to another: pass video data from one python script to another

I am now trying to pass a video (successive images):

write.py

import sys
import numpy as np
import cv2
from PIL import Image
import io
import time

while True:
    img = cv2.imread('cat.jpg')
    bimg = cv2.imencode('.jpg',img)[1]
    sys.stdout.buffer.write(bimg)
    sys.stdout.flush()
    time.sleep(1)

read.py:

import sys
from PIL import Image
import io
import cv2
import numpy as np
from io import BytesIO
    
while True:
    data = sys.stdin.buffer.read()
    img_np = cv2.imdecode(np.frombuffer(BytesIO(data).read(), np.uint8), cv2.IMREAD_UNCHANGED)
    cv2.imshow('image', img_np)
    cv2.waitKey(0)

If I output the write.py data to terminal, it prints. If I manually hand data to read.py that gets read. But put them together (python3 write.py | python3 read.py) and it just hangs. write.py just writes once, and read.py never seems to get it.

My guess is that the read code is waiting for the write code to "end" before it wraps up the data package and calls it an image. Though if that were the case, I would think it that doing a flush would fix it.

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