I am trying to pipe output from **FFmpeg** in **Python**. I am reading images from a video grabber card and I am successful in reading this to an output file from the command line using dshow. I am trying to grab the images from the card to my OpenCv code to be able to further play with the data. Unfortunately, when I pipe out the images, I just get a display of the video as shown in the link: 

> 
> link: s000.tinyupload.com/?file\_id=15940665795196022618. 
> 
> 
> 

The code I used is as shown below:

```
import cv2
import subprocess as sp
import numpy
import sys
import os
old_stdout=sys.stdout
log_file=open("message.log","w")
sys.stdout=log_file

FFMPEG_BIN = "C:/ffmpeg/bin/ffmpeg.exe"
command = [ FFMPEG_BIN, '-y',
            '-f', 'dshow', '-rtbufsize', '100M',
            '-i', 'video=Datapath VisionAV Video 01' ,
             '-video_size', '640x480',
              '-pix_fmt', 'bgr24', '-r','25',  
          '-f', 'image2pipe', '-' ]    
pipe = sp.Popen(command, stdout = sp.PIPE, bufsize=10**8)

while True:
    # Capture frame-by-frame
    raw_image = pipe.stdout.read(640*480*3)
      # transform the byte read into a numpy array
    image =  numpy.frombuffer(raw_image, dtype='uint8')
    print(image)
    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()
sys.stdout=old_stdout
log_file.close()
cv2.destroyAllWindows()

```

Please do provide me some pointers to fix this issue. Help is greatly appreciated.