reading video from named pipe, h264

asked 2016-02-03 03:58:57 -0500

Rycco gravatar image

updated 2016-02-03 08:59:33 -0500

I am getting raw video from netcat and passing it to the pipe

nc -l -p 5777 -v > fifo

then i am trying to read the pipe and display the result in the python script

import cv2
import sys

video_capture = cv2.VideoCapture(r'fifo')
video_capture.set(cv2.CAP_PROP_FRAME_WIDTH, 640);
video_capture.set(cv2.CAP_PROP_FRAME_HEIGHT, 480);

while True:
    # Capture frame-by-frame
    ret, frame = video_capture.read()
    if ret == False:
        pass

    cv2.imshow('Video', frame)

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

# When everything is done, release the capture
video_capture.release()
cv2.destroyAllWindows()

However I just end up with an error

[mp3 @ 0x18b2940] Header missing this error is produced by the command video_capture = cv2.VideoCapture(r'fifo')

When I redirect the output of netcat on PC to a file and then reads it in python the video works, however it is speed up by 10 times approximately.

How can I process a h264 video from a named pipe ? The VideoCapture doesnt seem to work well, as I can not open it.

EDIT: What am I trying to achieve is displayed on following video as method 3 : https://www.youtube.com/watch?v=sYGdg...

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Comments

I'm also interested in the answer to this. It seems like VideoCapture is designed either to accept video from a camera that it knows how to interface with or a file, but not from individually supplied raw buffers of data.

briantopping gravatar imagebriantopping ( 2016-06-20 22:25:04 -0500 )edit

I have same issue. Any ideas, how to solve it?

nejtr0n gravatar imagenejtr0n ( 2017-01-14 11:52:53 -0500 )edit