Music 2 and MPEG-1 Layer 3 audio (MP3). QuickTime 4 was the first version to support streaming. It was accompanied by the release of the free QuickTime Streaming Server version 1.0. QuickTime 4 Player introduced brushed metal to the Macintosh user interface. On December 17, 1999, Apple provided QuickTime 4.1, this version's first major update. Two minor versions (4.1.1 and 4.1.2) followed. The most notable improvements in the 4.1.x family were: Support for files larger than 2.0 GB in Mac OS 9. (This is a consequence of Mac OS 9 requiring the HFS Plus filesystem.) Variable bit rate (VBR) support for MPEG-1 Layer 3 (MP3) audio. Support for Synchronized Multimedia Integration Language (SMIL). Introduction of AppleScript support in Mac OS. The requirement of a PowerPC processor for Mac OS systems. QuickTime 4.1 dropped support for Motorola 68k Macintosh systems. QuickTime 5.x QuickTime 5 was one of the shortest-lived versions of QuickTime, released in April 2001 and superseded by QuickTime 6 a little over a year later. This version was the last to have greater capabilities under Mac OS 9 than under Mac OS X, and the last version of QuickTime to support Mac OS versions 7.5.5 through 8.5.1 on a PowerPC Mac and Windows 95. Version 5.0 was initially only released for Mac OS and Mac OS X on April 14, 2001, and version 5.0.1 followed shortly thereafter on April 23, 2001, supporting the classic Mac OS, Mac OS X, and Windows. Three more updates to QuickTime 5 (versions 5.0.2, 5.0.4, and 5.0.5) were released over its short lifespan. QuickTime 5 delivered the following enhancements: MPEG-1 playback for Windows, and updated MPEG-1 Layer 3 audio support for all systems. Sorenson Video 3 playback and export (added with the 5.0.2 update). Realtime rendering of effects & transitions in DV files, including enhancements to DV rendering, multiprocessor support, and Altivec enhancements for PowerPC G4 systems. Flash 4 playback and export. A new QuickTime VR engine, adding support for cubic VR panoramas. QuickTime 6.x On July 15, 2002, Apple released QuickTime 6.0, providing the following features: MPEG-4 playback, import, and export, including MPEG-4 Part 2 video and AAC Audio. Support for Flash 5, JPEG 2000, and improved Exif handling. Instant-on streaming playback. MPEG-2 playback (via the purchase of Apple's MPEG-2 Playback Component). Scriptable ActiveX control. QuickTime 6 was initially available for Mac OS 8.6 – 9.x, Mac OS X (10.1.5 minimum), and Windows