HTTP Read
The HTTP Read module allows you to process images from remote site across the internet
instead of from your connected webcam. This module can also be used to access internet
enabled webcams that may be connected on your local network.
Interface
Instructions
1. Camera Type - select which type of camera you wish to connect to.
2. Url - Enter the web URL in the provided box. The url should be a
HTTP Push server or to a single web image that when reloaded
would provide a different image. Any url provided via the Camera Type dropdown will need to be
configured for your domain. If your camera type does not appear in the Camera Type list you will
need to find the appropriate url to use that when access will deliver a MJPEG image over a http
protocol.
3. Enter the HTTP Method in the dropdown
4. Username/Password - Enter any Basic HTTP authentication in the username and password text boxes.
5. Headers - Enter any additional HTTP headers needed
6. Refresh Frequency - Select how frequently the image should be reloaded. In the case of HTTP Push the image
will always be updated as quickly as the remote server provides the image.
7. Erase on Error - if the remote camera fails to send images (during a network/power/etc failure) clear
the image to black to indicate an error.
8. Timeout - the number of milliseconds to wait for a remote image. When this fails the
image will be cleared based on the above "Erase on Error" and a system variable SYSTEM_ERROR will
be set to indicate this timeout failure. Note that the rest of the pipeline DOES execute even
after this error.
Example
1. Insert the HTTP_READ module (located under the Loading/Saving level) into the RoboRealm
processing pipeline.
2. Enter the url specific to your camera. For the Axis 206 you would enter in your url
looking something like
http://camera.ip.address/mjpg/video.mjpg
but note that your IP number will most likely be different. If you do not know the url
of your camera image you may need to look under the hood of a HTML page that shows the
streaming image. You most likely have that page installed with the software that comes
with the camera. Using your browser select 'view source' and look for the url.
3. Press the "start" button and if you don't get any errors then you should then see
the image start streaming.
The HTTP_READ module does NOT read HTML pages. You need to provide it with the specific url
that will return a jpeg image. If will understand both moving jpeg images (mjpg) OR still
jpeg images that refresh each time they are reloaded.
Note that DLink, TRENDnet
and Linksys cameras have their own modules specific to those cameras
to allow for more of the camera features to be accessed in RoboRealm.
If you want to stream from a VLC server, you need to start the capture using VLC and then select
the Stream option under the Media menu. You will need to Add Http as a Destination, edit a profile
to select MJPEG encapsulation and M-JPEG as the Video codec in order for VLC to stream using MJPEG.
Once you press the Steam button at the end of the Wizard, you can now use this module with
http://localhost:8080/ as the URL assuming you didn't change the defaults. This should then start
showing the image within the main RoboRealm window.
Your final streaming output string should be something like
:sout=#transcode{vcodec=MJPG,vb=800,scale=Auto,width=320,
height=240,acodec=none}:http{mux=mpjpeg,dst=:8080/} :sout-keep
Note that while streaming VLC may not show the image being streamed.
See Also
RTSP Player
VLC Player
HTTP Text Module
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