Would it be possible to add sth. like an indicator that indicated if the file is likely to play flawless on standalones? I know that QPEL and GMC will likely mean that it won't but there are probably other things. However different chipsets play different files so you'd pretty much have to include all (few) available ones. If not in the main window maybe it could be included in a plugin.
Anyway just an idea to help me (and the other) not so knowledgable (about divx/xvid encoding settings) guys out there