The Sorenson codec is a digital video codec devised by the company Sorenson Media and used by Apple's QuickTime and the newest version of Macromedia Flash, a special version called Sorenson Spark.
For a long time the specifications of the codec were not public, and the only way to play back Sorenson video was to use Apple's QuickTime, or the MPlayer for Unix/Linux, which in turn piggy-backed Microsoft Windows DLL-files. Analysis and reimplementation by an FFmpeg developer revealed that the Sorenson codec was a tweaked variant of the H.264 standard. This codec is now supported in FFmpeg.
