As the name suggests, you can use AVIToolbox to perform various operations on your video files: split a big file into multiple smaller ones, extract or add audio streams, capture still images & more.

Here are the features that stand out:

• Very easy to use and has a simple interface (anyone can use this program successfully)
• Extract a fragment of the video and save it as a separate file
• Save the soundtrack of the movie file as a MP3 file
• Capture still images from the video stream automatically
• Support for multiple languages
• The free version has a nag screen urging you to purchase the full version
• Burn or rip DVDs (if ConvertXToDVD or CopyTo are installed)

Give AviToolbox a try if you want to split movie files, extract the music from the videos, capture pictures or convert DVDs into a file format you can save on your HDD.