I've joined two XviD files, extracted the AC3 audio stream, encoded with TMPGEnc and used IFOEdit to author the DVD. After approx 50% I get the following error message: Internal Error: additional Data required but no free space in input buffer! I've done everything by the book (the guide) but I always get the same error message. If I press OK the result is a perfectly good first half of the DVD but the second half has no audio! Does anyone have an idea how to rersolve the problem??