A specialized encoding tool. This legacy version was primarily aimed at fixing stability issues when uploading large files to video sharing sites and improved general transcoding reliability.
The specific versions you've listed were major updates released by Apple in March 2013: Audio Perception A specialized encoding tool
: Primarily addressed stability and performance issues, specifically resolving a bug where third-party effects would sometimes generate "green frames" during rendering. Compressor 4.0.7 : Removed the 1GB file size limit for direct uploads to A specialized encoding tool
The release of Final Cut Pro X 10.0.8 Motion 5.0.7 Compressor 4.0.6 A specialized encoding tool