Just a heads up. Apples latest Quicktime 7.4 update disables some ‘legacy’ codecs, specifically Sorenson and Sorenson 3. If you need to use these codecs, you must enable them within Quicktime Preferences, Advanced, Show Legacy Codecs. Cue “the more you know” music.

  • Very helpful. Was wondering why files I output now cause compato- problems with other users. Turns out AAC has been deemed "legacy" and the new version isn't the same. Thanks!