Git migrate repository

git remote add new_repo_name new_repo_url

git push new_repo_name master

git remote rm origin

Git, create new repository from subfolder

git clone --no-hardlinks repo_original new_repo;
cd new_repo
git filter-branch --subdirectory-filter subdir/you/want
git remote rm origin
git update-ref -d refs/original/refs/heads/master
git reflog expire --expire=now --all
git repack -ad


Reboot Linux box after a kernel panic

To reboot 10 seconds after a kernel panic

vi /etc/sysctl.conf
kernel.panic = 10

or

echo 10 > /proc/sys/kernel/panic

Motorola Xoom Power / turn on problem

Press power button and Vol Up at same time to solve that. Make sure you have enough battery

Converting JVT NAL sequence, H.264 video

ffmpeg -vcodec h264 -i 20120502_184627_65535.mp4 -vcodec copy -acodec copy 20120502_184627_65535_.mp4

Cool AT coomands

/*Retrieve ICCID*/
AT+CRSM=176,12258,0,0,10
+CRSM: 144,0,”98555063930031910316″

In this case ICCID is
89550536390013193061

/*Retrieve IMEI*/

Ubuntu Waiting up to 60 seconds more for network …

Ubuntu loves to mess with standards.

This problem occurs when you (manually) add more interfaces in /etc/network/interfaces

To avoid the 60 sec delay I know 2 ways:

- Use network manager
or
- Edit /etc/init/failsafe.conf and comment the sleeps

Recording Desktop activity with ffmpeg

ffmpeg -f x11grab -s wxga -r 25 -i :0.0 -sameq out.mpg 2> /dev/null

Edit incorrect commit

git commit --amend

Changing old commits:

git rebase --interactive $HASH

Compile OpenCV

Install packages:

sudo apt-get install build-essential libgtk2.0-dev libjpeg62-dev libtiff4-dev libjasper-dev libopenexr-dev cmake python-dev python-numpy libtbb-dev libeigen2-dev yasm libfaac-dev libopencore-amrnb-dev libopencore-amrwb-dev libtheora-dev libvorbis-dev libxvidcore-dev

Download FFmpeg:

cd /usr/local/src

wget http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2
tar xvfj ffmpeg-snapshot.tar.bz2
cd ffmpeg
./configure --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libxvid --enable-x11grab --enable-swscale --enable-shared
make
make install
ldconfig

cd /usr/local/src

wget http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/2.3.1/OpenCV-2.3.1a.tar.bz2/
tar xvfj OpenCV-2.3.1a.tar.bz2
cd OpenCV-2.3.1
cmake -D WITH_TBB=ON -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=OFF -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON .
make
make install