Test whether setting book type of DVD+R[W] discs to DVD-ROM makes them
compatible with drives that otherwise don't like them.

Integrate the remaining session videos when they are available.

Improve audio quality
- Filter out constant background noise from some of the talks.
- Compress audio volume?

Recheck video cutting.

Change title font to match Debconf logo better?  (It uses ITC Officina
sans and serif fonts, which are non-free.)
