Perian is a free, open source QuickTime component that adds native support for many popular video formats. It has been upd
New Features: * Major performance improvements * TrueAudio, MP1, and DTS audio support * Slice-based multithreaded decoding for MPEG-1/2/H.264 * Apple H.264 now handles AVCHD/interlaced video * Compatibility fixes for QuickTime 7.4 and Leopard * Objective-C GC compatibility * Fixed a crash in Toast * Better subtitle rendering * Subtitles play during MKV loading * Snow support * Miscellaneous bug fixes