MPEG1 Video Decoder in JavaScript
With still no common video format for HTML5 in sight, I decided to implement an MPEG1 decoder in JavaScript. I know there's already an h264 decoder for JavaScript around, but it's huge, compiled with emscripten and quite complicated.
An MPEG1 decoder sounded like a relatively simple and fun weekend project. While the real world use cases for this are of course a bit limited, I still learned a whole lot about video codecs in the process. The size of the source is just around 15kb gzipped and the performance is quite okay-ish - a 320x240 video easily plays with 30fps on the iPhone5.