lumberjack is a Python script for making EPUB3 media overlays allows you to step through an input file (either the XHTML files contained within an EPUB file, or a single source TEI XML file) while playing the corresponding audio transcript, in order to synchronise the two. lumbjerjack produces as output an Audacity-format label file (extension '.txt'), which it can then transformed into the appropriate SMIL files for inclusion in an EPUB 3 book, or a TEI XML element for re-insertion into the source file.

See docs/lumberjack.html for much more documentation (generated by Pycco from comments in the source file).