[Ogg][] is an open source multimedia container format ([why open source formats are a *Good Idea*][open]). [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/