on the web, oggz tool has chop support, so extracting part of video is
very easy and possible.
+When re-encoding video materials following command line gives more-or-less
+resonable video size while inserting keyframes for nice seek:
+
+ ffmpeg2theora -p padma --keyint 1 source_video.flv
+
VIDEO EDITING
which triggers switch to slide 42.
+In presentations which are created using Takahashi method (lot of slides with
+transitions which follow speaker) you might use just add subtitle to mark
+transition to next slide.
+
HTML5 WEB INTERFACE