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So, I realized there was some problem with ffmpeg. and I rebuilt and installed ffmpeg and then changed flags for cmake to make opencv.

For ffmpeg,

 ./configure --enable-gpl
 --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab 
make 
sudo make install

For OpenCV,

cmake -D CMAKE_BUILD_TYPE=RELEASE ..
make
sudo make install

Here's the complete script to install OpenCV 2.4.2 https://github.com/jayrambhia/Install-OpenCV/blob/master/Ubuntu/2.4/opencv2_4_2.sh

and here's my blogpost about OpenCV 2.4.2 installation in detail http://jayrambhia.wordpress.com/2012/06/20/install-opencv-2-4-in-ubuntu-12-04-precise-pangolin/

So, I realized there was some problem with ffmpeg. and I rebuilt and installed ffmpeg and then changed flags for cmake to make opencv.

For ffmpeg,

 ./configure --enable-gpl
 --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab 
make 
sudo make install

For OpenCV,

cmake -D CMAKE_BUILD_TYPE=RELEASE ..
make
sudo make install

Here's the complete script to install OpenCV 2.4.2 https://github.com/jayrambhia/Install-OpenCV/blob/master/Ubuntu/2.4/opencv2_4_2.sh

and here's my blogpost about OpenCV 2.4.2 installation in detail http://jayrambhia.wordpress.com/2012/06/20/install-opencv-2-4-in-ubuntu-12-04-precise-pangolin/