Letme check my ffdshow settings...
* Codecs: Most set lo libavcodec. Set libavcodec as the decoder in a format so ffdshow runs when a file of that format is opened. If you want to use it DVDs or VCDs, you should set MPEG1 & 2 to libavcodec. But consider that those formats aren't fully implemented in ffdshow, so may may see artifacts or a performance decrease.
* Tray & dialog settings: Select "Show tray icon" to make sure that ffdshow loads when you load a video. If the tray icon appears when you open the video... then you should be happy
