QuickTime 7.6 Released

Get ready QuickTime junkies — Apple is taking care of you. If you check Software Update, you’ll notice a new flavor of QuickTime is available today.
From Apple’s support document, here is what we can expect 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 [...]

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[Source: TheAppleBlog]