I don’t think VSO are looking for a conversion time race.
I think VSO wants:
A software that will convert all possible video codecs they can put their hands on.
Easy software so easy, granny can use it, and have a hell of a nice output, then again not in competition with CCE with 2 or 3 passes, for the extreme video quality fanatics
Speed is not priority one, and for me as a user, speed it not a priority either.
If it takes 4 hours to convert a video, that’s an other story.
But if Software #1 takes 45 minutes, Software #2 takes 52 minutes, and ConvertXtoDVD takes 58 minutes, or even 1 hour and 10 minutes, I can live with that, as long as [B]the end result is what I want and easy to use[/B].
Now, for already compliant MPEG2 files, as Lapinou stated above, ConvertXtoDVD may need to recalculate the bitrate to make it fit on a DVD5.
Still need to do some other stuff, like add your Chapters (If enabled).
So I guess this is why those MPEG2 still needs to be treated just like an other source, and not so a 100% copy of the stream.
My 2 cents, from a user that is not 100% concerned about the speed, that do not want 45 steps, and 12 software to convert 1 video.