Opening IP camera with openbr

[Eric Offermann]

I am trying to view an ip camera with openbr, as an example to see if I can get the stream to open, I am using a public duke ip camera.  Here is my command:

br -gui -algorithm PerFrameDetection -enroll http://plazacam.studentaffairs.duke.edu/mjpg/video.mjpg

I am going to start stepping through the code now, but I was not sure if there was some trick to IP streams.

This is the output I get:

Set algorithm to PerFrameDetection

Enrolling http://plazacam.studentaffairs.duke.edu/mjpg/video.mjpg

stream failed to open http://plazacam.studentaffairs.duke.edu/mjpg/video.mjpg

100.00%  ELAPSED=00:00:00  REMAINING=00:00:00  COUNT=1

I did see this in the code:

openbr/plugins/stream.cpp

...

// We can open either files (well actually this includes addresses of ip cameras

// through ffmpeg), or webcams. Webcam VideoCaptures are created through a separate

// overload of open that takes an integer, not a string.

// So, does this look like an integer?

Opencv seems to be installed correctly with FFMPEG and I have opened the webcam in VLC successfully on that machine.

[Charles Otto]

It should work if you edit this line:

https://github.com/biometrics/openbr/blob/master/openbr/plugins/stream.cpp#L252

and replace:

            video.open(getAbsolutePath(input.file.name));

with:

            video.open(input.file.name.toStdStr());

You may also have to put the camera address in a .txt file (i.e. as the only line in a .txt file, and enroll that), although I was able to stream the camera after just making the above source code change.

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[Eric Offermann]

That did the trick, thanks!  It is toStdString() for those who also have this issue.

[David Yu]

On Thu, Nov 20, 2014 at 2:16 AM, Eric Offermann <ejo...@gmail.com> wrote:

That did the trick, thanks!  It is toStdString() for those who also have this issue.

Did the same but got the same error still.

I installed opencv (2.4.10 though) from http://openbiometrics.org/doxygen/latest/linux_gcc.html

I followed those instructions (except for the opencv version) and I'm not sure if I still need to install something?

I'm on Ubuntu 13.04 x64 

--

When the cat is away, the mouse is alone.
- David Yu

[Charles Otto]

I would try following this note from the build instructions, and see if that resolves the issue:

https://github.com/biometrics/openbr/wiki/Build-OpenCV-with-Video-Support-on-Ubuntu

[David Yu]

On Thu, Nov 27, 2014 at 12:54 AM, Charles Otto <otto...@gmail.com> wrote:

I would try following this note from the build instructions, and see if that resolves the issue:

https://github.com/biometrics/openbr/wiki/Build-OpenCV-with-Video-Support-on-Ubuntu

Thanks.  That works!