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iPhone is nice to take videos. However, one headache is the video may be rotated by 90 degree if you play it with non-Apple software such as MPlayer on Linux or Windows. This tutorial will introduce how to rotate the video taken from iPhone or other sources on Linux by [...]
Sat, Sep 27, 2014, Continue reading at the source
MPlayer is a great movie player. SSH is a great tool to connect and transfer data over the network securely. Combining these 2 great tools together will be greater. You may already has a small server storing some movies or videos or music and playing them on your laptop will [...]
Thu, Sep 25, 2014, Continue reading at the source
The Linux kernel has a generic driver for a graphic framebuffer named vesafb on intel boxes. It provides a nice large console for most of modern displays. Setting VESA modes for Linux kernel with 32-bit and 16-bit boot protocol are different. We introduce both methods here. Linux kernel with 32-bit [...]
Thu, Sep 25, 2014, Continue reading at the source
The posix_spawn() and posix_spawnp() functions create a new child process from the specified process image constructed from a regular executable file. It can be used to replace the relative complex “fork-exec-wait” methods with fork() and exec(). However, compared to fork() and exec(), posix_spawn() is less introduced if you search on [...]
Tue, Sep 23, 2014, Continue reading at the source
LVM is a great tool to manage hard disks on Linux—you can abstract the hard drives away and manage logical volumes from volume groups, you can dynamically add or remove hard drives while the file systems on the logical volumes need not to backed up and recovered, and you may [...]
Fri, Aug 15, 2014, Continue reading at the source
Ctrl keys are important and possibly most frequently used in Emacs. However, it is painful on today's common PC keyboards since Ctrl keys are usually in the corner of the keyboard main area. Why the key mappings in Emacs are designed like this? After it was designed, Emacs was commonly [...]
Wed, Jul 30, 2014, Continue reading at the source
git merge is frequently used during development of projects managed by git. There are many common questions about git merge and I find most are solved and discussed on StackOverflow. Here, I summarize useful ones so that others who want to learn git merge need to do the search again. [...]
Mon, Jul 28, 2014, Continue reading at the source
In this post, creating a file-backed virtual block device (VBD) and installing Fedora 20 in the Xen DomU via internet will be introduced. This domain is created on a Fedora 20 Dom0 as introduced in Installing Xen on Fedora 20 as Domain-0. For better performance, you may consider using LVM [...]
Mon, Jul 28, 2014, Continue reading at the source
I ever introduced Installing Xen on Fedora 17 as Domain-0 as the first try to use the xen package delivered from Fedora and get away from manually compiling Xen and patching the kernel. In this post, I introduce installing Xen Dom0 on Fedora 20. Installing Xen First, install the xen [...]
Fri, Jul 25, 2014, Continue reading at the source
It is common to set up git servers to host git repositories. Branching is lightweight in git and a very friendly mechanism to manage code. Here, I summarize a cheatsheet of common git branching commands for working on repositories from a git server. This post assumes that you have basic [...]
Thu, Jul 24, 2014, Continue reading at the source


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