Popwire today announced the release of Compression Master 3.1, a free upgrade to its Mac OS X encoder. Version 3.1 offers enhanced features, extended format support as well as Tiger and QuickTime 7 compatibility. Among the highlights are H.264 (AVC) video, Windows Media MBR, High Definition (HD) support, Flash video and full QuickTime video integration. The software sells for US$395.00.