Stream video from raspberry pi to PC without latency (<150ms)

readme.md

To run this correctly

1. Run the readFifo.sh file on client and ls the same directory to see if a pipe is made
2. Run the showVid.py on the client (same directory) and see if your readFifo.sh gives output
3. Run the ncStream.sh script on your raspberry pi, your client will pop out a video stream!!!

ncStream.sh

#!/bin/bash

raspivid -vf -n -w 640 -h 480 -o - -t 0 -b 2000000 | nc <your-pc's-ip> 5777

# This is the code to be run on the raspberry-pi
# Your pc's IP is the client IP which you can get by ifcongif
# Make sure both of these devices are on the same network ex. Home Wifi
# 5777 is the port

readFifo.sh

#!/bin/bash

if [ -p fifo264 ]
then
	echo "Starting stream on fifo264"
	rm fifo264
fi
mkfifo fifo264
nc -l -v  -p 5777 > fifo264

# this script is run on the client side
# this makes a named pipe fifio264 which listens to the stream from port 5777

showVid.py

# this is another script which you need to run on the client side 
# Make sure you have open-cv installed 
import cv2
import subprocess as sp
import numpy

FFMPEG_BIN = "ffmpeg"
command = [FFMPEG_BIN, '-i', 'fifo264', '-pix_fmt', 'bgr24',
           '-vcodec', 'rawvideo', '-an', '-sn', '-f', 'image2pipe', '-']

# fifo264 is the pipe name

pipe = sp.Popen(command, stdout=sp.PIPE, bufsize=10**8)

while True:
    raw_image = pipe.stdout.read(640*480*3)
    image = numpy.fromstring(raw_image, dtype='uint8')
    image = image.reshape((480, 640, 3))
    if image is not None:
        cv2.imshow('Video', image)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
    pipe.stdout.flush()

cv2.destroyAllWindows()