John McIntosh is giving a talk on GStreamer - he's been building support for it into Squeak lately. It's a pretty large open source library that supports various media formats, so it's a useful thing to have.

Sounds like he's added it in using primitives, and is thus far 32 bit only. Interesting problem in terms of supporting it from Smalltalk - GStreamer has its own garbage collection framework. That means you don't want to try to have its objects managed from the Smalltalk side, of course.