Getting Rid of DTS/AC3 Audio using ffmpeg on Linux to Play MKV Files on iOS or Android

I encountered the problem on iPhone that MKV video files with AC3 are played with no sound. The OPlayer reports to me that “According to DTS patent, DTS is forbidden to play , None of the media player on iPhone/iPad can play DTS”. However, the video file can be played in MPlayer on Linux just […]

Profiling Vim to Find Out Which Plugin Makes Vim Slow

Vim is pretty fast and powerful. However, the core of Vim is (yet) single-threaded (some discussions and tries on porting Vim to be multi-threading, but not yet there). This means some functions that are slow will block Vim there and you have to wait for it. While Vim is fast, some plugins are not. When […]

Blocking JavaScripts from a Site in Chrome in 2 Easy Steps

You may be aware of the GitHub’s largest DDoS attack in history on Mar. 27, 2015 (some context, technical details, and discussions): We've been under continuous DDoS attack for 24+ hours. The attack is evolving, and we're all hands on deck mitigating. — GitHub Status (@githubstatus) March 27, 2015 One important technique when facing this […]

How to Print PowerPoint Poster by HP Designjet 500 Plotter

First time getting my hand on a plotter (HP Designjet 500) directly to print a poster, I found it was an interesting experience. But configuring the printer settings was not that straightforward compared to using normal office A4 printers. I took photos of how it was configured for reference of my own and also those […]

Free VPNs for iPhone Users: OpenVPN + Ovpn Spider

VPNs are useful for testing viewing webpages from a remote location or visiting blocked websites. In this post, I will introduce a method for finding and using free VPNs on iPhone. Note that the VPNs are free and the providers are not identified. Hence, only use this method for visiting public webpages or keeping visiting […]

iPhone Connecting to Internet Using Windows PC’s Network through USB Cable

Note that this was only tested on certain combinations like this (Windows 7 with iOS 8), this (Windows 7 with iOS 7), this and this (Windows 7 with iOS 9.3.2 (iphone 6s)). Windows 7 seems a possible Windows OS that can work. Recently, I tested it on Windows 8 and iOS 9. Unfortunately, it did […]

Making Chrome Accept Self-Signed Certificates on Linux

If your website uses a self-signed certificates, Chrome will show a warning every time and you need clicks to continue. In this post, I will introduce how to make Chrome accept self-signed certificates for sites on Linux. This post is made short on purpose and you need to search the Web and learn if you […]

MPlayer over SSH to Play Movie from Remote Host

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 be convenient. In this post, […]

Keyboard Key Mapping for Emacs: Evil Mode and Rearranging Alt, Ctrl and Win Keys

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 on the Lisp Machine keyboards […]

How to Make Thunderbird Not Wrap Long Lines Automatically

Thunderbird automatically wraps lines by 72 characters by default. But wrapping in 72 characters may not look well on all clients. Some may want Thunderbird not to wrap lines and leave the receiver’s email client to choose the length to wrap lines. This post introduces how to make thunderbird not wrap lines automatically. First, open […]

Improving ssh/scp Performance by Choosing Suitable Ciphers

Update on Oct. 9, 2014: You should be aware of the possible security problems of blowfish and it is suggested not to be used. Instead, you may consider ChaCha20 as suggested by Tony Arcieri. To use this with OpenSSH, you need to specify the Ciphers in your *.ssh/config* files as chacha20-poly1305@openssh.com possibly with another default […]

How to Set Up A Gitolite Git Server – A Ten-Minute Tutorial

I ever introduced seting up git server using SSH or gitosis. However, gitolite is the way to go for managing git servers if you want an lightweight authentication layer. gitolite provides many very usefull features which can control each user’s right on each branch. I set up one gitolite git server and am very happy […]

Auto Indenting for OCaml Code in Vim with ocp-indent

The built-in indenting in Vim for OCaml seems not very good. How to set up auto indenting for OCaml code in Vim? ocp-indent works very well for me. This posts introduces how to configure Vim to use ocp-indent to automatically indent/format OCaml code. First, install ocp-indent after installing opam: $ opam install ocp-indent Second, configure […]

How to Configure Outlook-style Email Reply Header in Thunderbird

Thunderbird’s email reply header is short and not like the ones in Outlook and other email lients. Thunderbird provides several integrated reply headers”. However, the Outlook-style reply header with sender, receiver, date, and other information are clear and useful (e.g. my boss cc’ed an email to me to let me handle a request and I […]