QTCoffee 1.2.5 is a set of command-line Mac OS X utilities for manipulating QuickTime movies and other QuickTime readable media (AVIs, MPEGs, as well as audio files such as MP3s and AACs). Features include:
Joining (concatenating) movies or audio files, so they play one after the other
Multiplexing of movies so they play at the same time. Useful for:
Putting together audio and video tracks from other utilities
Masking unwanted (noisy) parts of a video
Letterboxing content
Picture-in-picture effect
Watermarking video
Scaling movie tracks (for resizing video content)
Changing the playback rate of movies or audio
Extracting or removing tracks
Extracting or removing chapters
Splitting a movie into equal duration pieces or at specified times
Splitting a movie into individual chapters
Creating chapters or connecting chapter tracks and creating chapter files for AAC podcasts to be processed with Apple's ChapterTool