Disabling mailto links in Firefox

Set network.protocol-handler.external.mailto to false in about:config to disable mailto links. Works in Firefox 2 and 3.

Tearing while playing video with mplayer on Ubuntu

I had a slight tearing problem while playing video with mplayer on my Ubuntu 8.10 machine. My machine has a Intel i945 graphics card with the i915 driver. This is how I solved it.

In my case the problem was that mplayer used wrong xvideo adaptor.

$ mplayer -v file.avi
...
using Xvideo port 97 for hw scaling

So it's using port 97.

Running xvinfo displays information about the xv xorg extension. Two adaptors in my case; one bad and one good. Mplayer is unfortunately using the bad one because it always picking number #0.

Relevant parts from xvinfo:

Adaptor #0: "Intel(R) Textured Video"
port base: 97
Adaptor #1: "Intel(R) Video Overlay"
port base: 113

Port 97 is Textured Video and port 113 is Video Overlay. The -vo parameter can be used to tell mplayer which adaptor to use.

mplayer -vo xv:port=113 file.avi

And bam! That's it.

Parse HTML using CSS selectors

lxml is a nice library for parsing XML and HTML with python. It can use CSS selectors to find nodes.

Here's an example that shows how smooth it is to use.

>>> from lxml.html import parse
>>> google = file("google_se.html") # saved google result page for "example"
>>> root = parse(google).getroot()

This one fetches all the anchor texts (truncated to not break the page.)

>>> [link.text_content()[:20] for link in root.cssselect(".g h3.r a")]
['Image results for ex', 'Example (rapper) - W', 'Example - Wikipedia,', 'MySpace.com - EXAMPL', 'Dynamic Programming ', 'example - definition', 'example - Definition', "Example - I don't wa", 'XML by Example - Goo', 'Example', 'example']

This one fetches all the link destinations (also truncated.)

>>> [link.get("href")[:20] for link in root.cssselect(".g h3.r a")]
['http://images.google', 'http://en.wikipedia.', 'http://en.wikipedia.', 'http://www.myspace.c', 'http://www.avatar.se', 'http://www.thefreedi', 'http://www.merriam-w', 'http://www.youtube.c', 'http://books.google.', 'http://www.example.o', 'http://www.docbook.o']