QuickTime hits 7.6 and includes various patches and tweaks to the H.264 encoding, AAC encoding, and compatibility with iChat and Photobooth.  The relase can be found below:

Summary

  • QuickTime 7.6 includes changes that increase reliability, improve compatibility and enhance security. This release is recommended for all QuickTime 7 users.

What’s in this update?

Video:

  • Improves single-pass H.264 encoding quality
  • Increases the playback reliability of Motion JPEG media

Audio:

  • Improves AAC encoding fidelity
  • Audio tracks from MPEG video files now export consistently
  • Application Support:
  • Improves compatibility with iChat and Photo Booth

 

Security:

  • For information on the security content of this update, please visit this website:

http://support.apple.com/kb/HT1222