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Simple Python Motion Jpeg (mjpeg server) from webcam. Using: OpenCV,BaseHTTPServer
#!/usr/bin/python
'''
Author: Igor Maculan - n3wtron@gmail.com
A Simple mjpg stream http server
'''
import cv2
import Image
import threading
from BaseHTTPServer import BaseHTTPRequestHandler,HTTPServer
from SocketServer import ThreadingMixIn
import StringIO
import time
capture=None
class CamHandler(BaseHTTPRequestHandler):
def do_GET(self):
if self.path.endswith('.mjpg'):
self.send_response(200)
self.send_header('Content-type','multipart/x-mixed-replace; boundary=--jpgboundary')
self.end_headers()
while True:
try:
rc,img = capture.read()
if not rc:
continue
imgRGB=cv2.cvtColor(img,cv2.COLOR_BGR2RGB)
jpg = Image.fromarray(imgRGB)
tmpFile = StringIO.StringIO()
jpg.save(tmpFile,'JPEG')
self.wfile.write("--jpgboundary")
self.send_header('Content-type','image/jpeg')
self.send_header('Content-length',str(tmpFile.len))
self.end_headers()
jpg.save(self.wfile,'JPEG')
time.sleep(0.05)
except KeyboardInterrupt:
break
return
if self.path.endswith('.html'):
self.send_response(200)
self.send_header('Content-type','text/html')
self.end_headers()
self.wfile.write('<html><head></head><body>')
self.wfile.write('<img src="http://127.0.0.1:8080/cam.mjpg"/>')
self.wfile.write('</body></html>')
return
class ThreadedHTTPServer(ThreadingMixIn, HTTPServer):
"""Handle requests in a separate thread."""
def main():
global capture
capture = cv2.VideoCapture(0)
capture.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH, 320);
capture.set(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT, 240);
capture.set(cv2.cv.CV_CAP_PROP_SATURATION,0.2);
global img
try:
server = ThreadedHTTPServer(('localhost', 8080), CamHandler)
print "server started"
server.serve_forever()
except KeyboardInterrupt:
capture.release()
server.socket.close()
if __name__ == '__main__':
main()

wpoet commented Jan 9, 2016

Igor, this is a terrific example! Wonderful work!!!!

When I run it on my Ubuntu 15.10 system, it works, but initially I get this error message:
server started

127.0.0.1 - - [09/Jan/2016 16:54:47] "GET /cam.mjpg HTTP/1.1" 200 -

Exception happened during processing of request from ('127.0.0.1', 42188)
Traceback (most recent call last):
File "/usr/lib/python2.7/SocketServer.py", line 295, in _handle_request_noblock
self.process_request(request, client_address)
File "/usr/lib/python2.7/SocketServer.py", line 321, in process_request
self.finish_request(request, client_address)
File "/usr/lib/python2.7/SocketServer.py", line 334, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "/usr/lib/python2.7/SocketServer.py", line 657, in init
self.finish()
File "/usr/lib/python2.7/SocketServer.py", line 716, in finish
self.wfile.close()
File "/usr/lib/python2.7/socket.py", line 283, in close
self.flush()
File "/usr/lib/python2.7/socket.py", line 307, in flush
self._sock.sendall(view[write_offset:write_offset+buffer_size])
error: [Errno 32] Broken pipe

The program still serves the mjpeg stream, but this message comes on every re/connect. Do you have an idea why this happens?

br Wolfgang

Great work, Igor!

Wolfgang, the program uses pipes (http://www.python-course.eu/pipes.php) to communicate the output to the server. When you disconnect from the port, it breaks the existing pipe, and when you reconnect, it breaks the previous pipe and starts a new one.

If you were running the script locally and the opencv output was displayed in a window, you could use the 'Keyboard Interrupt' to break the loop without any errors. That doesn't work in the browser because you've already used a pipe to get there.

tl;dr : that error is nothing to worry about, you'll pretty much see it every time you disconnect or reconnect.

Nice man!! exactly I was looking for on web. Saved my time 👍 )
I am doing this for rtsp stream.
And this way RTSP gets embedded in a web page.
Thanks

hi,

when connecting a flash mjepg netstream reader I got
192.168.178.54 - - [16/Feb/2016 22:19:44] "GET /cam.mjpg HTTP/1.1" 200 -
and the cam stops working. where my fault?

Owner

n3wtron commented Feb 23, 2016

Hi bluelemonade,
I've made the program for my raspberry robot, I've never used it with a "flash mjpeg netstream reader" ( not even know what is it a flash mjpeg reader).
Is it work in a browser?
If in a browser works, you could check the network traffic (i.e. with wireshark) to check the difference between a browser and "flash mjpeg reader"

Hello Igor, I have adapted your code for a project of mine. Thanks for sharing this!

I noticed you did not include a license with this, and I want to be respectful of your ownership of this code. Am I free to use my modified version of this gist in my project under any license?

Thanks!

hello ...people...I used this code ...it works for me ...like it doesn't give any error...but I cannot see the web cam stream in browser for some reason ??.....help is much appreciated.

Thanks

Owner

n3wtron commented Mar 21, 2016

Hi @njlochner you are free to use it and modify it (GPLv3 License) when I've shared this code I forgot to add the licence, I'm sorry.
@tuf11244, if you post your code somewhere I can help you better.

Hi @njlochner you are free to use it and modify it (GPLv3 License) when I've shared this code I forgot to add the licence, I'm sorry.
@tuf11244, if you post your code somewhere I can help you better.

Thanks!

Hi
It works fine, but I can't open the stream from multiple browsers.

@Asymptote, in order to do this you need to adapt this into a threaded HTTP server. I have done so in my code. See the accepted answer from this thread: http://stackoverflow.com/questions/14088294/multithreaded-web-server-in-python

Owner

n3wtron commented May 11, 2016

@Asymptote thanks to @njlochner I've adjust it for multi thread.

Benoit-Besnier commented May 19, 2016 edited

Hi !

I wanted to see what we can do with this. It seems to work fine, because i don't get any error and the infinite loop is running, but when i want to access at "localhost:8080" with my browser, i receive an error : "Message corrupt". Any idea about it ?

For those who get the error "Cannot import Image", you should replace
import Image
by
import PIL as pillow
from PIL import Image

Anyway, thank you for sharing this =)

Kiolali commented Jun 8, 2016

Hey!
When i try to access "http://127.0.0.1:8080/cam.mjpg" with my browser I get the following exception:

Exception happened during processing of request from ('127.0.0.1', 50752) Traceback (most recent call last): File "C:\Python27\lib\SocketServer.py", line 599, in process_request_thread self.finish_request(request, client_address) File "C:\Python27\lib\SocketServer.py", line 334, in finish_request self.RequestHandlerClass(request, client_address, self) File "C:\Python27\lib\SocketServer.py", line 655, in __init__ self.handle() File "C:\Python27\lib\BaseHTTPServer.py", line 340, in handle self.handle_one_request() File "C:\Python27\lib\BaseHTTPServer.py", line 328, in handle_one_request method() File "C:\coding\mpeg streamer example\simple_mjpeg_streamer_http_server.py", line 31, in do_GET jpg.save(tmpFile,'JPEG') File "C:\Python27\lib\site-packages\PIL\Image.py", line 1439, in save save_handler(self, fp, filename) File "C:\Python27\lib\site-packages\PIL\JpegImagePlugin.py", line 471, in _save ImageFile._save(im, fp, [("jpeg", (0,0)+im.size, 0, rawmode)]) File "C:\Python27\lib\site-packages\PIL\ImageFile.py", line 480, in _save for e, b, o, a in tile: ValueError: Not a valid number of quantization tables. Should be between 1 and 4.

The problem seems to be this line:
jpg.save(tmpFile,'JPEG')

Any idea?

Best,
Hanna

Kiolali commented Jun 8, 2016

i fixed the error above by uninstalling pil and pillow (seem to cause conflicts if both are installed). Then I reinstalled only pillow.

Now I get a popup window "python.exe has stopped working.." when accessing the mjpg via browser

caused by this line:
jpg.save(self.wfile,'JPEG')

Any ideas?

Best, Hanna

Vinggui commented Aug 19, 2016 edited

Nice, worked like a charm.... Thank you!
The only trouble I had was related to python OpenCV, which I needed to install, beside the OpenCV library, the python-opencv (sudo apt-get install python-opencv)
But working great now...

plumgeek commented Sep 6, 2016

Hello Igor, this looks very promising . I have a couple questions maybe someone could help with. Please forgive me I'm a bit of a noob at this.

I'm presently using SimpleCV, which includes an mjpeg streaming server that seems to work in a similar way to this code, however with that server I often have to re-load the page a few times to get the image feed to appear, and sometimes it disappears after it's been streaming for a while. I thought maybe it would be more reliable if I were to somehow get the stream to write to a location and then use Apache to actually serve it up. There is a post here about streaming OpenCV images via Apache. I discovered your code above when starting to work through that tutorial.

I don't understand how to write the code to get the components to talk to eachother. Would you mind giving a bit more detail and example of how to actually use the above code? I assume I would kick it off in a terminal and let it run, at which time I could access the stream via a browser, but I'm not sure how to actually save images from OpenCV/SimpleCV to the server.

And a followup, is there a reason you're not just using Apache? I'm sure there was a good reason, it just seems it's already installed with most Linux distros so I'm not sure why one would write another server.

Thanks so much!

Owner

n3wtron commented Sep 7, 2016

Hi @plumgeek,
I've written this code for my raspberryPi robot (performance and lightweight).
Using apache it would be foolish.
If you want to save every frame with my script you have to extract the infinite loop at line 21 and save the frames into a folder instead of using tmpFile = StringIO.StringIO()

I hope that I have been useful to you

I have the same issue that @Kiolali

Owner

n3wtron commented Nov 9, 2016

Hi @andresR8,
I'm sorry, but I don't have any Windows to try, the only thing that I can say is try to check windows firewall on python.exe, maybe (really maybe) the problem is access to the network port.
I'm saying that by the description of wfile : "Contains the output stream for writing a response back to the client. Proper adherence to the HTTP protocol must be used when writing to this stream."

I am having issue when multiple clients connect to the server. When first client connects, streaming works perfectly. As soon as I second client connects, get following dump many times and server crashes:

[mpjpeg @ 0x560aa30ffae0] Expected boundary '--' not found, instead found a line of 127 bytes
[mpjpeg @ 0x560aa30ffae0] Expected boundary '--' not found, instead found a line of 8 bytes
[mpjpeg @ 0x560aa30ffae0] Expected boundary '--' not found, instead found a line of 98 bytes
[mpjpeg @ 0x560aa30ffae0] Expected boundary '--' not found, instead found a line of 127 bytes
[mpjpeg @ 0x560aa30ffae0] Expected boundary '--' not found, instead found a line of 127 bytes
[mpjpeg @ 0x560aa30ffae0] Expected boundary '--' not found, instead found a line of 12 bytes
[mpjpeg @ 0x560aa30ffae0] Expected boundary '--' not found, instead found a line of 50 bytes
[mpjpeg @ 0x560aa30ffae0] Expected boundary '--' not found, instead found a line of 3 bytes
[mpjpeg @ 0x560aa30ffae0] Expected boundary '--' not found, instead found a line of 41 bytes
[mpjpeg @ 0x560aa30ffae0] Expected boundary '--' not found, instead found a line of 32 bytes
[mjpeg @ 0x560aa30faae0] error count: 64
[mjpeg @ 0x560aa30faae0] error y=19 x=8
[mjpeg @ 0x560aa30faae0] overread 8
[mjpeg @ 0x560aa30faae0] No JPEG data found in image

Any idea how to fix multi client access issue?

Thanks

pauls06 commented Dec 30, 2016

I had the same issue as @Kiolali and @andresR8.

Replacing the problem line
jpg.save(self.wfile,'JPEG')
with
self.wfile.write( tmpFile.getvalue() )
avoids the problem.

Kiolali commented Jan 6, 2017

I have the same issue as @wpoet ("broken pipe")
Any ideas how to solve it?

accessing the mjpeg stream via browser works - but if I use a test client like "insomnia" (GET url_mjpeg_stream) I don't get any response..

Thank you for the code. I got an output "server started" . Is it considered successful ?
Because I was expecting to stream it in opencv just like how I used to stream the webcam directly into my pc.

awood85 commented Feb 13, 2017

Hi, thanks very much for this code, exactly what I was after.

I had it working locally on the rpi but couldn't access it from either my phone or PC when trying to access it across the network. The Python output didn't show the 200 response message.

I adjusted lines 44 and 60 to point to the local IP of the rpi (which I've got acting as an access point if that makes any difference) and could get the 200 response while trying to access from both phone and PC although I never saw any output. This also stopped me viewing the stream locally from the pi. Reverted back and still no images locally or over the network.

I'll delete the code and start again and see if that fixes it but any ideas in the mean time why it might not be working. Ultimately I want to view the processed output after some openCV manipulation on my phone with the rpi being headless.

Thanks

Adam

amvlr commented Mar 9, 2017

Traceback (most recent call last):
File "/home/pi/simple_mjpeg_streamer_http_server", line 6, in
import cv2
ImportError: No module named 'cv2'

Please help me out!

RichLewis007 commented Mar 16, 2017 edited

I got it working on macOS by doing the following:
note: it's written for Python 2.

  • install OpenCV 3.x for python
  • install pillow for Python2:
    pip2 install pillow
  • removed the unneeded lines that are causing errors:
	capture.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH, 320); 
	capture.set(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT, 240);
	capture.set(cv2.cv.CV_CAP_PROP_SATURATION,0.2);
  • run it:
    python2 motion-jpeg-server.py

  • see it:
    in browser, go to:
    http://127.0.0.1:8080/cam.mjpg
    to see video.

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