Add Ogg post.

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+[Ogg][] is an open source multimedia container format (see
+[here][open] for why open source formats are a *Good Idea*).
+[Ogg/Vorbis][vorbis] is popular for encoding audio, and
+[Ogg/Theora/Vorbis][theora] is popular for encoding video.
+
+You can easily record desktop tutorials encoded in Ogg/Theora/Vorbis
+using [recordMyDesktop][] (see my [[screen recording]] post for
+details).  However, sometimes your recording ends up with a bit of
+cruft at the ends that you want to crop out.  Enter [oggz][], a simple
+tool for minor Ogg stream editing.
+
+For example, you can quickly extract the first 657 seconds of a video with
+
+    $ oggz chop -e 657 -o output.ogv input.ogv
+
+You can then add comments using [vorbiscomment][] from the
+[vorbis-tools][] package.
+
+    $ vorbiscomment -a input.ogv -t "ARTIST=Some Guy" -t "TITLE=A Title"
+
+[Ogg]: http://xiph.org/ogg/
+[open]: http://xiph.org/about/
+[vorbis]: http://www.vorbis.com/
+[theora]: http://www.theora.org/faq/#13
+[recordMyDesktop]: http://recordmydesktop.sourceforge.net/
+[oggz]: http://xiph.org/oggz/
+[vorbiscomment]: http://wiki.xiph.org/VorbisComment
+[vorbis-tools]: http://www.xiph.org/downloads/