Aside from the 2012 GStreamer Conference
, another mini-summit that happened the week of LinuxCon San Diego in late August was the Linux Security Summit. While there aren't videos, slides from this security summit are now available.
For those interested in Linux security, slides of all the talks have been posted to their Wiki schedule page
There's coverage on UEFI Secure Boot, DNSSEC, sandboxing Linux server applications, the Linux kernel Integrity Subsystem, In-Kernel Access Control, finding kernel vulnerabilities with Coccinelle, cryptography, AppArmor, SELinux, TOMOYO, and much more.