thanks for your answer, but I tried with Constant bitrate (CQ) and it was the same issue. In fact, I did my trials with small chapter , about a couple of minutes, and went to the end of the process , ie burning a disc I just obtained dark screen with good audio. If I choose "don't delete files" and edit AVI file, i get an audio file I can encode with TMPG, It just don't know the Avs script file. I think I can execute programs one by one , but DVD2SVCD is made to avoid it ! after checking I find that I 've got two folders system in windows directory : system and system32. My Win is ME version, if i put the avisynth.dll file in the system32 (as i'm supposed to) DVD2SVCD fail with error : don t find avisynth.dll in Windows\system, so I remove it from system32 to system.