When I make videos, I almost always use Ogg to encode the audio. Storing the audio in Ogg saves space on my machine without sacrificing quality. However, I invariably need to loop, concatenate, or change the audio in some way, which can be difficult. For many of these tasks I turn to the OGMtools suite to make the process easier.
The OGMtools suite contains several utilities to manage Ogg Media Stream (OGM) files. The tools were designed to be used along with video ripping software to encode DVD movies, but they can be used for much more.