Version History of QuickTime Player 4.12
- 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.