Hi, in fact there is 3 version of real producer (who use the rv9 codec) - producer preview ( free but a bit old) - producer helix basic (free) - producer helix pro (need pay) the preview version was made before the helix version. the helix version have the official real gui (preview version have no gui) , but the command line tools are buggy ( helix CLI crash often on the winXP os) the preview version is stable. and the realmedia editor bundle with the preview version have a missing file (in fact it the atrc audio codec .dll file who was outdated, and u have an error : unsupported codec, -21XXX910). to solve all these problems, u can if u want try my light version (1.6Mo) : it's the preview command line + helix pro codec + rmeditor fixed. and of course u can try my gui (actually version 1.1 but the v11.2 will be out in few days with the support of subtitles and 2 audio streams). Bye.