22 Jul
2014

My ffmpeg Cookbook

I have been doing more screencasting lately, so I thought I’d share some recipes here, for my own future use and in case anyone else wants to use them. I capture my videos using Kazam on Ubuntu, usually by resizing my second monitor to 800×600 and then capturing that. Kinda eye-bleeding to record but looks good in playback and also works well either in tiny web view or on a big screen. I also screencapture my android device and for that I use Screen Recorder.

Edit: I mostly used OBS for video from around 2019.

Continue reading →

17 Jul
2014

Using Phing with Travis CI

We’ve started using Travis CI on one of my projects to run some build processes to check that everything looks good before we merge/deploy code. One thing I ran into quite quickly was that I wanted to install phing in order to use the build scripts we already have and use elsewhere, but that it isn’t provided by default by Travis CI.
15 Jul
2014

Quickly add Amazon Cloudfront as a CDN

Right now I’m working on an application which is experiencing lots of interest – and therefore lots of load! We needed to look at ways of trying to bring down the pressure on the servers, and decided to use a CDN (Content Delivery Network) for our image files. It was surprisingly painless to implement once I got into it so here it is in case it’s helpful. Continue reading →
08 Jul
2014

View Only Headers with Curl

When working with curl, it can give lots of excellent and detailed information, but sometimes it is too much! Today I’m fiddling with the caching headers on a client’s application, so I’m only interested in seeing the headers and not the body of the response. Making a HEAD request changes the output I get, so I really do want to GET and then only see the headers.

Handily, when you use the -v verbose flag with curl, it sends the output to stdout as usual, but the extra information including the headers goes to stderr. This means that I can therefore view the headers only throwing away stdout completely:

curl -v -s http://awesome-site.com 1> /dev/null

(you need the -s to stop curl from “helpfully” printing progress bars as well)

03 Jul
2014

Video: Git Remotes and Tracking Branches

Here’s a little demo video that I put together to explain pushing/pulling with multiple remotes and how tracking branches make this easier. It’s one of the chapters from my “Git Adventures” talk, but it didn’t make it in to the talk in Amsterdam last week since we chose a different adventure that time – sharing it here in case it’s helpful to anyone else, and so I can find it later!

I also blogged about the tracking branches in a bit more detail if you’re interested.

03 Jul
2014

Understanding Tracking Branches in Git

Here’s a topic that took me a while to understand in git, and now (I think!) I do, I thought I’d write it all down while I can remember!

Some branches in git (such as your origin/master branch) will usually track the remote branch that they are related to. But what if you want to create a relationship between local and remote branches? Or stop them from tracking? Here’s some pointers Continue reading →

01 Jul
2014

Running Pull Request Builds with Jenkins

The joind.in projects are set up so that the build process runs on pull requests when they are opened, which is great! It means that contributors don’t have to wait for one of the maintainers to look at it, only to reject the contribution on something that could be picked up automatically. I’ve had a few questions about the setup so I thought I’d share how it works. Continue reading →
12 Jun
2014

What Got You Involved in Open Source?

I did a very unscientific twtpoll recently regarding what brought each of us into open source. Plenty of people took the time to vote or retweet, so I thought I’d loop back around and let you know how it looked overall when the poll closed. Continue reading →
06 Jun
2014

Logging to Stdout with Monolog

My worker scripts have really basic logging (as in, they echo when something happens, and I can see those in the supervisord logs). Which is kind of okay, but I wanted to at least add timestamps in to them, and maybe send emails when something REALLY bad happened.

I’m a huge fan of Monolog so I grabbed that, but it wasn’t immediately obvious which of the many and varied options I would need for this fairly simple addition. It turns out that the right thing to use is the ErrorLogHandler, so now my code looks like this:

<?php

require "vendor/autoload.php";

$logger = new \Monolog\Logger("log");
$logger->pushHandler(new \Monolog\Handler\ErrorLogHandler());

$logger->addInfo("Something happened");

And the output is neatly in lines like this:

[2014-06-05 17:00:47] log.INFO: Something happened [] []

You can do a lot of different things with Monolog, but since I had to look up this simplest of all options, I thought I’d share.

02 Jun
2014

Colourless Git Output

I teach git and often have issues with bad projectors where you can’t see the colours. Recently I had a setup where even white on black was more or less invisible, but using black text on a white background worked okay. There’s lots of documentation on how to turn on colours in git but not so much about how to turn them off.

Try putting the following into .git/config:

[color]
    branch = false
    diff = false
    interactive = false
    status = false

I had expected to be able to set color.ui to false but that didn’t seem to make much difference, so I now use the settings above. I thought I’d drop it here in case anyone else is looking for the same thing.