I have been using Handbrake for quite sometime now but have recently increased my usage due to my acquisition of an Apple TV. The Apple TV is only capable of playing video files that are supported by iTunes. These supported video formats do not include AVI (well not without a Jailbreak and aTV Flash, but I will save that for another time) which is the current format of majority of my movies and TV shows. Due to this flaw in the Apple system I have been forced to convert all my unsupported videos to a format supported by iTunes. Enter Handbrake!

Handbrake is an open source video transcoder available for Windows, Mac and Linux and comes equipped with various conversion setting presets. Handbrake can convert a single video file, a queue of video files or a DVD video in a few simple steps:

1. Select the source video file or DVD title/folder
   
2. Select a destination for the converted file
   
3. Select a conversion preset or configure the specific audio/video settings
   
4. For a single file conversion click the Start button or click Add to Queue if you wish to convert multiple files. Click Start once you have added all videos to the queue
   
5. The conversion process will start and notify you once all videos in the queue are complete

Note: For greater compatibility with iTunes, enable the ‘Use iPod/iTunes friendly (.m4v) file extension for MP4′ setting

Handbrake is by far the best free MP4 video transcoder that I have come across. Let me know your opinions or alternatives that you may use in the comments.