No output video means I cannot see my modified preview before processing.
This is in Divx 6.9.2 Codec (2 logical CPUs) compression mode with mp3 128kbit/s 44,100hz under audio full processing mode compression.
I supposed this is a bug.
Solution: click on the output play button first (no video showing, but audio works). Then go to options and check output video and input video as well (or F10 and F9).