@salimelo said:

hi Fred, thx, that was the solution. Found out that Isadora couldn't exceed 18 + something Frames. Syphon did the job both with 25 and 30 fps in outstanding Quality, I feel super grateful. I rendered the Audiofile and glued them together in Studio one 4. Only flaw is some heavy compression of studio one, which results in worse visual quality again, but at least smaller (about 1/4) video, and still useable. Thanks a lot :)