Cannot Change Opencv Webcam Setting

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I have encountered a problem that when I use opencv API, I cannot change the width and height of

Webcam output:

    cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH, );

    cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT, );

But after seaching the internet, I have found the key point:

The webcam on linux usually uses the V4L api, and I have not install the library for V4L.

When OpenCV is built, it does not includes the V4L API interface.

So, that's the solution:

1.install V4L dev library on ubuntu: libv4l-dev

2. enter opencv sourcecode dir, and reinstall it:

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local  -D WITH_IPP=OFF ..

make

sudo make install

After using cmake, I can see the output for V4L:

--   Video I/O:

--     DC1394 .x:                  NO

--     DC1394 .x:                  NO

--     FFMPEG:                      YES

--       codec:                     YES (ver 53.35.)

--       format:                    YES (ver 53.21.)

--       util:                      YES (ver 51.22.)

--       swscale:                   YES (ver 2.1.)

--       gentoo-style:              YES

--     GStreamer:                   NO

--     OpenNI:                      NO

--     OpenNI PrimeSensor Modules:  NO

--     OpenNI2:                     NO

--     PvAPI:                       NO

--     GigEVisionSDK:               NO

--     UniCap:                      NO

--     UniCap ucil:                 NO

--     V4L/V4L2:                    Using libv4l (ver 0.8.)

--     XIMEA:                       NO

--     Xine:                        NO

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