First I would like to say thanks for a great product
I have a few suggestions I think could be nice if they where implementet.
1) The installer should place a icon in the start menu also, not only on the desktop if chosen.
2) If you choose 2-pass encoding, you could dump the output data from the first run, to the "NUL.*" file. There is now reason to you disk IO for the first run.
3) It would be nice to have a way to input any number for video bitrate.
4) (FFMPEG encoder) make it optional to use the -minrate/maxrate parameter. As now its only posible to make CBR output.